Device for bottom blowing of metal with gas, method of manufacture of blowing monoblock unit and refractory material for manufacture of such monoblock unit

FIELD: metallurgy.

SUBSTANCE: proposed device includes cluster unit with blowing unit arranged inside it; it consists of coaxial parts molded from refractory materials in form of truncated cone or truncated pyramid; said parts are engageable with one another forming passages between them for delivery of inert gas; on side of larger base of blowing unit flange is provided with hole for delivery of inert gas. Formed between flange and blowing unit is cavity. Blowing unit combined with cluster unit includes cylindrical porous refractory insert located between working part of blowing unit and metal flange. In central part of its lower base there is spherical recess in form of segment for receiving inert gas; upper base has square seats forming gas distributing cavity before working part of blowing unit. Cylindrical metal envelope welded to metal flange has at last two external beads over circle or metal angles welded to it. Passages in working part of blowing unit are oriented in way of motion of gas or are formed by projections over entire length on one of engageable taper or trapezoidal components of blowing unit. Cluster unit and porous insert are made from refractory material of definite composition on base of mineral binder; working part of blowing unit is made from carbon-containing mass of definite composition on organic binder. Monoblock unit of cluster unit and blowing unit is molded in molding built-up molding rigging. Use is made of multi-stage manual pneumatic ramming at initial stage of molding and automatic vibration ramming at final stage for obtaining large blowing units, up to 500 mm in height. Monoblock thus molded is subjected to heat treatment at a temperature of 200-400°C.

EFFECT: enhanced reliability and safety; guaranteed capacity of unit; increased service life.

14 cl, 7 dwg

 

The invention relates to ferrous metallurgy, in particular to devices for bottom purge with inert gases, metal, method of their production in the form of a monoblock and refractory material for the manufacture of candy bar.

The famous design of the blow-off device for bottom blowdown metal in a ladle with an inert gas, comprising two constituent of the nesting block of the lower and upper stop them refractory sleeve and a porous refractory tuyere having the shape of a truncated cone, enclosed in a metallic shell having a larger base welded to the shell at the bottom with a gas-feeding tube, while the porous lance attached to the metal shell by means of refractory mortar (Art. “Refractories for supplying argon gas into the furnace-ladle” Osberg L.V. and others, Refractories, 1991, No. 9, p.34-36, similar).

It is also known a device for bottom blowdown metal containing refractory well block stop it blowing lance with directional channels, consisting of coaxially spaced formed of refractory material elements, the outer of which has the shape of a truncated cone and is enclosed in a metal shell conical shape having a larger base components blowing tuyere flange, made with a hole for the filing of an inert gas, and between the flange and the constituent elements of blowing tuyere made cavity. In addition, the internal elements are made of at least one centrally located parts in the shape of a truncated cone or truncated multi-sided pyramid, and the inner surface of the outer element has a form adequate to the shape of the inner member, a metal shell with a composite refractory elements blowing lance is attached to the socket block by refractory mortar.

Channels blowing tuyere is made with a cross section in the form of a circle or polygon, or segment is located in the plane of contact of the inner and outer parts of the blowing lance. In addition, the domestic element of the blowing lance in the form of a truncated multi-sided pyramid can be made of compressed layers oriented in the direction of the inert gas between the layers are channels.

The formation of channels in the known device is in the firing process vent site in the burnout canalobre elements of organic or mineral material, is pressed into the individual constituent elements of the blowing lance (patent RU №2129165, 6 C 21 C 5/48, 1999, prototype)

The main disadvantage of the known technical solutions - this use is in the manufacture of tuyeres metal protective shell over the entire height of the purge node, which is welded to the flange with a gas-feeding pipe and generally performs the function of sealing process gas stream, providing end-to-end flow of the latter through the tuyeres into the metal bath bucket.

During high-temperature processing of metal in the ladle (up to 1700° (C) a metal shell in the surface layer purge node melts and gradually in the process of operating fade 2/3-3/4 of its original height, which determines the penetration of the metal under the action of ferrostatic pressure in the seam formed around the perimeter mates blowing tuyere with a female unit. It is noted, from the viewpoint of increasing the thickness of the seam, compounded by the leaching of refractory mortars, holding a lance with a nesting block, under the erosive effect of the metal, stir while it is blowing through the bottom tuyeres. The passage of the metal along the seam in the harsh operating conditions of the bucket with a sharp cyclical changes in the surface temperature of the lining of the bottom from the 1700° (process temperature) up to 600-800°With (cooling associated with the replacement of gates after each heat) causes the appearance of additional mechanical stresses on the lateral surface of the tuyere and breeding unit, initiating their chips work surface. This causes increased isopropanol device. During deep penetration of the metal in the seam it is likely subsidence purge node under ferrostatic pressure metal separating it from the breeding unit that creates an emergency situation.

In addition, the disadvantages of the blow-off device with a porous lance should be attributed to the increased porosity of the latter, which results in high wear rate of the purge node and infiltration steel, as well as changing the purge characteristics of the lance as it wears.

Known from a prototype device for bottom blowdown metal gas with directional channels provides a more efficient mixing of the metal in the ladle, but this device is also characterized by low life caused by clogging of the channels blowing tuyere metal. This is due to the relatively large diameter of the round channels (min 0.15 mm) or large thickness cracks (min 0.1 mm), which do not prevent the infiltration of steel inside the lance under the action of ferrostatic pressure of the metal. To obtain channels with a smaller diameter or a smaller thickness cracks on manufacturing techniques lances prototype, providing use as kanaloobrazuyuschego organic or mineral materials, is not possible.

In addition, in the manufacture of blow-off device from Chennai technology is problematic to get lance with a stable blow-off characteristics due to carbon deposits on the walls of the channels, which are formed during the burning of kanaloobrazuyuschego in the heat treatment process lances.

In addition, known from prototype a method of manufacturing a device for bottom blowdown metal gases, providing interfacing outer surface of the blowing lance is collected from a composite of refractory elements enclosed in a metal shell, with the inner surface of pressed nesting block using refractory mortar does not provide, as noted above, reliable bonding that does not exclude the probability of separation blowing tuyere from the breeding unit in service under ferrostatic pressure metal with subsequent last passage formed in the gap between the mating parts of the breeding unit and the purge device.

Introduction in the production of the domestic steel industry process for continuous casting of steel has led to the need to increase capacity as steel-making units, and steel ladles, which in turn has led to structural changes in the lining of the bottom of the bucket towards the thickening of the active layer. In this regard, at the metallurgical enterprises has shifted more and more used in the linings of the bottoms of the buckets larger the height of the purge device 450 to mm

Known of the prototype of the method of manufacturing a device for bottom blowdown metal gases, based on the technology of pressing components of the blow-off device of the refractory mass, does not provide for formation of large nesting blocks obtaining a uniform height, 250 mm compacts. With increasing height of the products formed by the known methods of pressing or vibratoriem, raznorodnosti nesting blocks increases and leads to a decrease in their durability in service. Therefore, from well-known literary sources recommended in this case to use a composite nesting blocks (“Device for blowing metal inert gases” Vaginanew, Vcccore, “Refractories and technical ceramics”, No. 7, 1998, 40-43).

The disadvantages of composite nesting blocks should be their insufficient reliability in service due to ascent the uncovered part of the upper nesting block for partial wear during operation.

Therefore, for the production of large nesting blocks used received in foreign practice widespread concrete technology. However, a cast of large nesting blocks also have a significant disadvantage. During operation under conditions of p is skih cyclic changes of temperature in the surface layers of the lining of the bottom of the nesting blocks manufactured by the casting method, prone to cracking along the planes parallel to the working surface, which leads to increased wear of refractories in the spallation.

In addition, known from prototype materials (aluminium oxide, calcined alumina, spinel, periclase, and others) do not provide uniform wear of the working surfaces of the nesting block and blowing tuyere. The cleaning lance, in comparison with a female unit, is experiencing a higher voltage during heat shock and cavitation effects of metal flows by blowing an inert gas, as well as additional erosion impact and mechanical stress during oxygen cleaning hot surface lance after release from a steel bucket, causing it to local wear.

Higher performance in comparison with the prototype, is characterized by a carbon-containing material, is known from the patent of the Russian Federation No. 2167206, IPC C 21 C 5/48, B 22 D 1/00, B 28 B 3/04, 2001, for the manufacture of composite vent sites offered corundophilite weight ratio of components, wt.%:

granular filler 53-64

ground filler 23-28

carbonaceous filler 3-15

organic binder 3,5-6

antioxidant under severe operating conditions

Products from otoplenie from this charge, have a higher resistance to corrosion of the metal and slag, as well as high heat resistance and high strength.

However, with the high performance of the above-noted properties, these materials have a very significant drawback - low resistance to oxidation of carbon-containing material at the operating temperature conditions of service (1600-1700° (C)that also determines the local wear of the vent site in comparison with the nesting block of periclase, spinel or corundum structures.

The task, which sent a group of inventions linked by a single inventive concept (bottom blowdown metal gas, a method of manufacturing the purge monoblock and refractory material for the manufacture of a monoblock)is a device for bottom blowdown metal gas with high performance properties, such as reliability and safety in the operation of the purge device, eliminating the infiltration of the metal into the channels of the blowing lance and the “sinking” of the last separating her from the breeding unit under ferrostatic pressure metal due to hard mount vent site in the first block, a steady flow of inert gas at the outlet of the blowing lance at long Gara who seeks the life of the purge device, as well as increasing the life of the purge device by providing Runestones blowing tuyeres and breeding unit, paired in a monolithic piece. To solve the problem of obtaining the above technical result in the known device for bottom blowdown metal containing nesting block located therein purge node, consisting of coaxile located extruded refractory material parts, made in the form of a truncated cone or truncated pyramid, associated with the formation between them of channels for supplying the inert gas having a larger base purge node metal flange is made with a hole for supplying inert gas, and between the flange and purge the node cavity, and the purge node is equipped with a female unit in the claimed device purge node further comprises a cylindrical porous refractory insert, located between the working part of the purge node and the metal flange in the Central part of the lower base of which is a spherical recess in the form of a spherical segment height h equal to 10-15 mm, for the reception of inert gas, and at the top of the square base is made of the nest, forming a gas cavity before the work is the art of blow-down node, formed perpendicular spherical protrusions on the entire surface of the porous insert with radius r equal to 5-8 mm, and the distance l between the projections, is equal to 35-40 mm, and a cylindrical metal shell, an inner diameter which is adequate to the diameter of the porous insert having at least two external ribs around the circumference with a fillet radius r1equal to 5-6 mm, spaced from each other at a distance of not less than 10 mm, or welded to the metal shell of the corners of the profile 30×30 mm and 10-20 mm long, located in the generatrix direction through equal distances that make up 1/4 of its circumference, with a metal shell height, part 2/3-1/2 of the height of the assembled vent site, made of sheet steel with a thickness of 0.8 to 2 mm and is welded to the metal flange, the diameter D of which is 1.3-1.5 diameter D1the bottom of the working part of the assembled vent site, made in the form of a truncated cone, or 1.3-1.5 length of the bottom of the larger base of the truncated pyramid, and the channels in the working part of the purge of the site, oriented in the direction of motion of the gas, produced by protrusions along the length on one of the mating truncated conical or trapezoidal elements purge node generated in forming the defined profile of the press tooling.

In addition, in the working part of the purge node slotted channels in the interfaces of the constituent elements can be placed around the circumference of the truncated cone or perpendicular to the side faces of the quadrangular pyramid and run no longer than 10 mm, and asked the thickness of the channels in the range of 0.05 to 0.3 mm

In addition, in the working part of the purge type node of a truncated pyramid 10-12% of its channels can be completely closed to a height of 25 mm and 10-12% at 50 mm from the top of the Foundation vent site, provide the required profile of the upper die of the press snap in forming the constituent elements of the trapezoidal shape.

This is achieved by the fact that in the known method of manufacturing a device for bottom blowdown metal, including manufacturing pressing of refractory material of the breeding unit and individual components purge node, heat treatment, Assembly, purge node and its installation in the mating surface of the nesting block, according to the invention, as a refractory material for the manufacture of the nesting block and a porous insert using refractory mass on mineral mapping, and in the manufacture of the working part of the purge unit - carbon mass of organic combination, with the constituent elements of the working part of the purge node before Assembly p is kodat two-stage heat treatment - low temperature at 200-400°in an oxidizing atmosphere and subsequent high temperature at 1100-1600°in a reducing environment, and forming a breeding unit with purge node in the piece produced by pressing the nesting block in press snap collapsible design complete with purge node installed in the base moulding boxes on the support plate in its center, thus compressing the nesting block is produced with the integrated use of multi-stage manual pneumotubograme at the initial stage of molding and automatic vibroshaping at the final stage of compression, providing large-bleed devices with a height up to 500 mm, followed by heat treatment molded candy bar at a temperature of 200-400°C.

At the same time when forming the constituent elements of the working part of the purge of the site and subsequent formation of the purge monoblock kit with purge node using fine-grained refractory mass, providing porous structure compacts after heat treatment with the maximum diameter of the channel time of not more than 50 microns and a permeability in the range of 0.5 to 10 μm2.

In addition, the molding compound elements purge candy bar of refractory material on the miner who enoy together produce after maturing prepared the masses for at least 24 hours.

In addition, a flat trapezoidal elements purge node after high-temperature heat treatment is polished, including slotted channels.

The solution of the problem with obtaining the specified technical result is also achieved by the fact that well-known carbon-containing refractory material based on alumina for the production of composite elements of the working part of the purge of the site, including granular filler, powder filler, carbon-containing filler, an organic binder, and an antioxidant, further comprises a ground filler silicon and a metallic phase iron oxide (F+Fe2About3)received a joint grinding granular filler, silicon and metal phases, taken in the ratio (50-88):(10-30):(2-20), to obtain a specific surface of more than 2 m2/g, in the following ratio of ingredients, wt.%:

granular filler 53-64

ground filler 28-30

carbonaceous filler 3-10

antioxidant 1-3

organic binder 3,5-6

In addition, the granular filler, however, has molefractions composition with a maximum grain size of 2 mm.

The task is achieved by the fact that known corundum composition of the refractory material for the manufacture of the nesting block, including granular the filler, ground filler and ligament further comprises a milled steel fibre, at the same time as the chords used mineral binder content of physically bound water is not more than 15%, in the following ratio of ingredients, wt.%:

granular filler 58-80

ground filler 15-35

metal fiber of 0.5-1.5

mineral binder 4-6

In addition, the granular filler is polyrational composition with a maximum grain size of 2 mm.

In addition, as a mineral binder use phosphoric acid or alumacraft binder.

This is achieved by the fact that in the known refractory corundum material for the manufacture of porous inserts, including granular filler, finely ground filler and a bunch of the invention, the granular filler is monofuctional composition with a maximum grain size of 2.0 mm, and as bundles use mineral binder content of physically bound water is not more than 15% in the following ratio of ingredients, wt.%:

granular filler 70-85

it is the filler 10-25

mineral binder 4-6

This refractory material for the manufacture of the porous insert comprises a mineral binder phosphoric acid or alumacraft binder.

The above features of the described group of inventions are essential and interrelated causal connection with the formation of the essential features that are necessary and sufficient to achieve the technical result.

The invention is illustrated by drawings, where figure 1 shows a longitudinal section of the blow-off device and a view from above, the working part of the purge node which has one loop purge and consists of a composite refractory elements like truncated cones, one Central solid and one external flat; figure 2 is a longitudinal section of the device and a view from above, the working part of the purge node which has two circuits blowing, while the inner loop purge the node with the four-pin surface mating cones, and external - with eight contact surface; figure 3 is a longitudinal section of the device and a view from above, with working part of the purge node type of a truncated pyramid, which consists of a set of composite refractory plates; figure 4 - cross section of the SS in figure 3; figure 5 is a top view of the purge device purge the node type of a truncated pyramid with a partially overlapped channels in the working part of the purge node (four Central and four corner channel); figure 6 - cross-section B-G-D-E-F - 5. Fig 7 shows a section of the blow-off device, the bottom vent site which is complete with a gas-feeding tube is located in the first block.

Device for bottom blowdown metal gases consists of a nesting block and purge node B, collected from porous protective insert 1 in the set with a block of pressed composite cone elements of the working part of the purge of the site, including a solid truncated cone 3 and the outer hollow truncated cone 4 (figure 1 and 2), or with the block of compressed refractory plates trapezoidal shape 2 (figure 3).

The set of working parts blowout site, assembled from trapezoidal plates 2 or conical elements 3 and 4, is installed on the center of the porous insert 1, which, in turn, mounted in gas-tight metal casing of cylindrical form 5, which is welded to the metal flange 6 with a gas-feeding tube 7. Between the flange and the lower base of the porous insertion cavity for receiving the inert gas 8, and between the upper base of the porous insert and the working part of the purge unit - gas distribution chamber 9.

Device for bottom blowdown metal works as follows.

The inert gas through a gas-feeding tube 7 flows into the gas receiving cavity 8 purge node and the pressure evenly penetrates through the porous insert 1 in the gas distribution chamber 9, from there it is distributed through the channels 12 between the conical surfaces 3 and 4 or between the trapezoidal surfaces 2 of the mating elements of the working part of the vent site. At the outlet of the purge node inert gas jet penetrates into the liquid metal and mix it in a ladle.

Device for bottom blowdown metal, providing a very tight fit directly to the external surface of the collected refractory elements purge node in the inner surface of the nesting block, as well as the design of the profile of a cylindrical metal shell with wheels or corners, tightly bonded with the metal flange of the vent site, provide a solid mount vent site, with a female unit, which ensures reliable and safe operation of the device for bottom blowdown metal. However, completely eliminated as the passage of metal on the mating surfaces of the vent site and the nesting block during operation and subsidence purge node with its branch from block under the pressure of the metal, which increases the efficiency of the device.

To provide guaranteed bandwidth devices for bottom blowdown metal during operation of the bucket is proposed in the working part of the purge node of the form of the truncated pyramid 10-12% to the signals overlap completely at a distance of 25 mm and 10-12% at 50 mm from the top of its Foundation. The proposed model is depicted in figure 5 and 6 four channel blocked in the Central zone of the tuyere and four channels in its angular zones. A different scheme of overlapping channels. With an average wear of the tuyere site, which is about 1.5-2.0 mm/melting, serial, opening new channels and after 15-20 30-35 heats will compensate for the lack of the required amount of gas for purging the metal caused by the clogging of the slits of the tuyere node during operation of the bucket.

Also, it is proposed to exclude penetration of metal into the cracks purge node under the action of ferrostatic pressure metal clearance in the purge node channels with a thickness of 0.05-0.1 mm and a length of not more than 10 mm, obtained by projections along the entire length on one of the mating truncated conical or trapezoidal elements purge node provided when forming the specified profile press snap.

Below is an example of preliminary preparation for Assembly of the individual elements of the blow-off device for bottom blowdown metal and method of Assembly of the latter.

Known methods of manufacturing lances on concrete technology or technology of forming a composite refractory elements of the semi-dry mass based, generally, on the use of mortgage bonds canalobre elements of the organization is organic or mineral materials, after the melting of which are formed channels profile, oriented in the direction of gas fed from the bottom in the steelmaking ladle through the bottom tuyere.

Marked entails significant technological complexity in the manufacture of blowing lances.

Channels to purge the site of the claimed device for bottom blowdown metal formed during Assembly of the constituent elements of blow-down node due to the relief surface of one of the mating parts, which has recesses in the form of grooves with specified width not exceeding 10 mm and a depth in the range of 0.05 to 0.3 mm, located at a specified distance from each other perpendicular to the base flat products trapezoidal shape, or by forming the product of the conical type.

To obtain on the surface of the product trapezoidal profile of the upper or lower stamp press snap is milled with the correct width and depth of the groove and with a fixed distance between the slots. To obtain on the surface of the product to be cast quite a blocked channel sample cutter groove forming this channel, produced by a given distance determined by the ratio of S1=S-(25-50 mm), where S is the length of the stamp, and the interval 25 - 50 range specified depth overlapping channel in mm.

For four the financing of hollow truncated cones milled punch in the middle part, made in the form of a truncated cone, with the formation of all components purge node conical form produced according to the method known from the patent of Russian Federation (RU # 2167206, 7 C 21 C 5/48, B 22 D 1/00, B 28 B 3/04, publ. 20.05.2001 year).

Asked width of narrow channels and their thickness is formed as the pair of flat elements trapezoidal shape and channel ring type, located on a circle when the pair of conical elements, as well as the number of constituent elements of the purge node is determined by calculation based on the required bandwidth of the purge node.

To ensure uniform wear of the working surfaces of the nesting block and purge node in the manufacture of the constituent elements of the working part of the purge node according to the invention using carbon-containing material in an organic link, and in forming the nesting block complete with purge node - refractory mass on mineral mapping. For microporous structure of the product, after heat treatment, with a pore size of not more than 50 μand a permeability in the range of 0.5 to 10 μm2use fine-grained positraction refractory mass. Thus, in the manufacture of components of the blow-off device for mineral mapping, to complete the process is obrazovaniya chemical compounds between her and it is material, the mass before forming must Mature for at least 24 hours.

The constituent elements of the working part of the purge of the site are two-stage heat treatment - low-temperature heat treatment at 200 to 400°in an oxidizing atmosphere and subsequent high temperature heat treatment at 1100-1600°in a non-oxidizing environment. In this case, the heat treatment of flat elements trapezoidal shape is produced using products as substrates refractory plate having a polished surface.

After high temperature heat treatment of the product with the plane of the trapezoidal shape with both sides polished, including slotted channels.

The Assembly purge node of the form of the truncated pyramid perform successive pair of elements trapezoidal shape. This pairing produced by grinding the contact profile of the surface of one piece with the flat surface of the other similar products. The plane of the last matched element tuyere node perform without specialized design.

The assembled vent site in the middle part of a tightly tied adhesive material such as adhesive tape, or pull together a metal band, made in the form of strips of sheet width of 5-10 mm and a thickness of 0.3-0.5 mm.

The Assembly purge node truncated to the USA produce consistent installing on internal solid truncated cone outer hollow truncated cones. Solid and hollow truncated cone grind in between a mating contact of the conical surfaces.

In the cavity of the cylindrical shell 5 with the flanges 10 insert heat at 200-400°With a porous box 1 to full its way into the metal flange 6 is welded to the shell.

You can use a metal shell made without wheels. In this embodiment, a role of fastening purge node with socket unit can perform metal corners 11 of the profile 30×30 mm and a length of ~10 mm, welded to the shell, lying in the direction along the circumference of a cylindrical metal shell through equal distances that make up 1/4 of its circumference.

Metal casing with welded flange and located it a foam insert mounted on the support plate with its center at the base of the assembled molding box, the internal dimensions of which correspond to the external geometry of the nesting block. Correct installation of fixed gas supplying passage of the tube through the Central hole in the base plate. On porous insert install the assembled set of working parts blowout site, the alignment of which provide a rigid metal fasteners.

Produce gradual loading a portion of the mass in the molding box to follow them her hand prematrimonial. When compacted layer constituting 1/3 of the height of the working part of the vent site, the latest release from removable fasteners. The final stage of compression are set to automatic vibroshaping to obtain purge monoblock with a specified height size.

After pressing apart the molding box and monoblock thermoablative at 200-400°C, after which it becomes fit for use.

Another option is making candy bar - pressing the purge node in the breeding unit in conjunction with a gas-feeding tube (Fig.7).

In this case, the installation of a cylindrical shell with welded flange and a gas-feeding tube and placed in it a foam insert to produce a pre-prepared in forming the box layer programovani mass height of 50-100 mm For clearance holes for a gas-feeding tube into the prepared layer in the Central hole of the base plate before forming insert the template after pressing knock.

Subsequent operations for forming candy bar produced in accordance with the foregoing method.

Listed below are the compositions of the refractory mass for forming the constituent elements purge node.

Refractory mass for pressing the working part of the purge of the site prepared in the MCA is sustained fashion edge-runner mills of the carbon-containing mixture in the following ratio of components, wt.%:

granular filler molefractions stock with maximum grain size of 2 m 53-64

joint grinding granular filler metal silicon and a metallic phase iron oxide (FeO+Fe2O3), taken in the ratio (50-88):(10-30):(2-20), with a specific surface area of 2 m2/g 28-30

carbonaceous filler 3-10

antioxidant 1-3

organic binder 3,5-6

It component is prepared by joint grinding granular filler, silicon metal and metal phase in a vibrating mill.

Fine grinding of raw materials is necessary not only for education during high-temperature firing kurbadstrasse material (SiC) as a result of chemical interaction of free silicon and free carbon (graphite) and education due to the chemical interaction of alumina with oxides of Garcinia FeO Al2About3with high melting point 1750-1780°and solid solutions FeO Al2O3with oxides of iron and aluminium, but also for their subsequent sintering education melloroos patterns of refractories. With increasing fineness of grinding increases the total surface of the grains, and their activity to chemical interaction increases, which implies almost complete binding of free carbon in CA the bid silicon and iron oxides in gerzina and the formation of solid solutions. This forms a very dense and at the same time, the fine pore structure of the silicon carbide percentual ligaments binding the granular filler.

We offer weight is realized when used as a granular filler oxide, calcined alumina and alumomagnesium spinels, and mixtures thereof, the carbonaceous component of graphite, graphite sang (graphite-bearing metallurgical waste), siliconized graphite, and others, as a complex of iron containing supplements of iron oxides (F+Fe2About3as organic ligaments phenol-formaldehyde resin or ethylene glycol together with a binder of phenolic powder (TFP), and as an antioxidant metallic Al and its alloy with Mg, amorphous boron, oxygen-free boron-containing compounds and other

In the manufacture of the nesting block offers a host with the following ratio of ingredients, wt.%:

granular molefractions filler with a maximum grain size of 2 mm 60-80

joint grinding granular filler and a metallic phase iron oxide (F+Fe2About3), taken in the ratio (80-97):(3-20) 15-35

metal fiber of 0.5-1.5

mineral binder 4-6

Introduction the composition of the charge of metal fiber and iron oxides allows to obtain products with high the strength characteristics, with the reduced tendency of the product to cracking under thermal loads.

We offer weight is realized when used as a granular filler oxide, calcined alumina, spinel, magnesia and mixtures thereof, as a complex of iron containing supplements of iron oxides (FeO+Fe2O3), and as a mineral binder orthophosphoric acid or lomographische binder content of physically bound water is not more than 15%.

Restriction on the content of physically bound water in the mineral binder is associated with possible destruction of the lining when it is heat treated after forming at the exorbitant value of the boundary moisture content.

Manufacture of porous inserts offers a host with the following ratio of ingredients, wt.%:

granular monofuctional filler with a maximum grain size of 2 mm 70-85

it is the filler 10-25

mineral binder 4-6

Monofuctional filler determines getproposal ability molded from the proposed mass of the porous insert and is determined experimentally.

The invention meets the eligibility condition “industrial applicability”because it is feasible using the existing means of production with the use of known technology is the future.

1. Device for bottom blowdown metal gas containing nesting block located therein purge node, consisting of a coaxially located extruded refractory material parts, made in the form of a truncated cone or truncated pyramid, associated with the formation between them of channels for supplying the inert gas having a larger base purge node metal flange is made with a hole for supplying inert gas, and between the flange and purge the node cavity and purge the node picked from the breeding unit, characterized in that the purge node further comprises a cylindrical porous refractory insert, located between the working part of the purge node and the metal flange in the Central part of the lower base of which is a spherical recess in the form of a spherical segment height h equal to 10-15 mm, for the reception of inert gas, and the upper base is made of a square socket, forming a gas cavity in front of the working part of the purge node formed perpendicular spherical protrusions on the entire surface of the porous insert with radius r equal to 5-8 mm, and the distance l between the projections, is equal to 35-40 mm, and a cylindrical metal shell, an inner di is the meter which is adequate to the diameter of the porous insert, having at least two external ribs around the circumference with the radius of the inner pair of 5-6 mm, spaced from each other at a distance of not less than 10 mm, or welded to the metal shell corners of the profile 30x30 mm and a length of 10-20 mm, located in the generatrix direction through equal distances that make up 1/4 of its circumference, with a metal shell height, part 2/3-1/2 of the height of the assembled vent site, made of sheet steel with a thickness of 0.8 to 2 mm and is welded to the metal flange, the diameter D of which is 1.3-1.5 diameter D1the bottom of the working part of the assembled vent site, made in the form of a truncated cone, or 1.3-1.5 length of the bottom of the larger base of the truncated pyramid, and the channels in the working part of the purge of the site is oriented in the direction of motion of the gas and is formed through forming the molded-defined profile presonally ledges along the entire length on one of the mating truncated conical or trapezoidal elements purge node.

2. The device according to claim 1, characterized in that the channels of the working part of the purge node in the interfaces of the constituent elements are located around the circumference of the cone or perpendicular to the side faces of the quadrangular pyramid and made slot length not exceeding 10 mm and set the thickness in the range of 0.05 to 0.3 mm

3. The device according to claim 1, characterized in that in the working part of the purge node of the form of the truncated pyramid 10-12% of its channels are completely blocked at a distance of 25 mm and 10-12% at 50 mm from the top of its Foundation that can provide the required profile of the upper or lower pressure stamp of presonally in the formation of the constituent elements of the trapezoidal shape.

4. A method of manufacturing a device for bottom blowdown metal gas, including manufacturing pressing of refractory material of the nesting block and separate the constituent elements of the working part of the vent site, their heat treatment, Assembly, purge node and its installation in the mating surface of the nesting block, characterized in that as a refractory material for the manufacture of the nesting block and porous insert is used a lot for mineral mapping, and in the manufacture of the working part of the purge unit - carbon mass of organic combination, with the constituent elements of the working part of the purge node before the Assembly is subjected to two-stage heat treatment - low temperature at 200-400°in oxidative environment and subsequent high temperature at 1100-1600°in a reducing environment, and forming a breeding unit with purge node in the piece produced by pressing the nesting block to press the snap-collapsible design complete with purge node, installed in the base moulding boxes on the support plate in its center, thus compressing the nesting block is produced with the integrated use of multi-stage manual pneumotubograme at the initial stage of molding and automatic vibroshaping at the final stage of pressing for providing the large blow-off devices up to 500 mm, followed by heat treatment of the molded candy bar at a temperature of 200-400°C.

5. The method according to claim 4, characterized in that when forming the constituent elements of the working part of the purge of the site and subsequent formation of the nesting block with vent site in the piece use fine-grained refractory mass to ensure that the porous structure of the compacts after heat treatment with the maximum diameter of the channel has not more than 50 microns and a permeability in the range of 0.5 to 10 μm2.

6. The method according to claim 5, characterized in that the molding compound elements purge monoblock of refractory materials in mineral binder is performed after aging prepared the masses for at least 24 hours

7. The method according to claim 5, characterized in that the constituent elements of the purge node perform flat trapezoidal slot channels, and after high-temperature processing ø ifout, including slotted channels.

8. Refractory carbonaceous material-based oxide, calcined alumina, alumomagnesium spinels and mixtures thereof for the manufacture of the constituent elements of the working part of the purge of the site, including granular filler, powder filler, carbon-containing filler, an organic binder and an antioxidant, wherein the powder filler further comprises silicon and a metallic phase iron oxide (F+Fe2About3), he received a joint grinding granular filler, silicon and metal phases, taken in the ratio (50-88):(10-30):(2-20), respectively, to obtain a specific surface of more than 2.0 m2/g, in the following ratio of ingredients, wt.%:

Granular filler 53-64

Ground filler 28-30

Carbonaceous filler 3-10

Antioxidant 1-3

Organic binder 3,5-6

9. The refractory material of claim 8, wherein the granular filler is polyrational composition with a maximum grain size of 2 mm.

10. Refractory material-based oxide, calcined alumina, alumomagnesium spinels and mixtures thereof for the manufacture of the breeding unit containing granular filler, powder filler and cord, characterized in that it is up to omnitele contains milled steel fibre, and ground the filler further comprises a metallic phase iron oxide (FeO+Fe2O3)and received a joint grinding granular filler and a metal phase, taken in the ratio (80-97):(3-20), the chords used mineral binder content of physically bound water is not more than 15%, in the following ratio of ingredients, wt.%:

Granular filler 58-80

Ground filler 15-35

Steel milled fiber of 0.5-1.5

Mineral binder 4-6

11. The refractory material of claim 10, wherein the granular filler is polyrational composition with a maximum grain size of 2 mm.

12. The refractory material of claim 10, wherein the mineral binder it contains phosphoric acid or alumacraft binder.

13. Refractory material-based oxide, calcined alumina, alumomagnesium spinel, magnesia and mixtures thereof for the manufacture of porous inserts, including granular filler, it is filler and cord, characterized in that the granular filler is mono-fractional composition with a maximum grain size of 2.0 mm, and as bundles of used mineral binder content of physically bound water is not more than 15%, the next time the ratio is AI ingredients wt.%:

Granular filler 70-85

It is the filler 10-25

Mineral binder 4-6

14. Refractory material according to item 13, wherein the mineral binder it contains phosphoric acid or alumacraft binder.



 

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