Method for treating powdered, especially metal containing initial material and apparatus for performing the same

FIELD: treatment of powdered, especially metal containing initial material introduced together with treating gas such as reducing gas for creating fluidized bed in fluidized bed chamber, for example in fluidized-bed reactor.

SUBSTANCE: treating gas at least after partial conversion in fluidized bed is removed out of fluidized bed and then outside fluidized bed it is partially recovered, preferably oxidized due to performing chemical, namely exothermal reaction with gaseous and(or) liquid oxidizer. Heat energy of such reaction at least partially is fed to fluidized-bed chamber, especially to fluidized bed or it is taken out of it. Cyclone is arranged over fluidized bed in fluidized-bed chamber. Powdered initial material is heated or cooled in zone of cyclone, namely near inlet opening of cyclone due to using treating gas at least partially recovered over fluidized bed in fluidized-bed chamber, possibly heated or cooled, and(or) due to using system for recovering treating gas.

EFFECT: possibility for decreasing caking on distributing collector of fluidized-bed reactor, lowered slagging in zone of fluidized bed.

10 cl, 1 dwg

 

The invention concerns a method of processing a powder, in particular metal-containing source material, and source material and the processing gas, in particular the reducing gas are introduced for the formation of the fluidized bed in the chamber of the fluidized bed, for example in a fluidized-bed reactor. In addition, the invention concerns a device for the formation of the fluidized bed, such as a fluidized-bed reactor.

The efficiency of the process in a fluidized bed can be controlled primarily by the composition of the processing gas, as well as by the temperature of the fluidized bed.

In the prior art it is known to regulate the temperature of the processing gas in the process in a fluidized bed by means of appropriate measures, for example by adding a cooling gas to achieve the required temperature level.

The present invention is to improve the method in accordance with the generic concept of claim 1 of the claims, as well as devices in accordance with the generic concept of claim 8 claims, whereby it is possible to achieve a particularly effective and the most economical form of thermal influence on the process in a fluidized bed.

This problem is solved in the invention by a method with the characteristics of claim 1 of the formula and a device having the characteristics of claim 8 claims.

Proposed the method is suitable preferably for processing, in particular for the recovery of powdery metal oxide, in particular powdered iron oxide. However, the invention is not limited to such application, so all options for recovery should be considered as examples.

The above-mentioned special embodiments of the valid with corresponding improvement which can be done to specialist for all others, especially equivalently, industrial processes that use the process in a fluidized bed. For example, the invention can also be applied in the field of cement industry.

In accordance with a particular form of execution of the relevant invention of the method fluidized bed is formed in part of the chamber of the fluidized bed, particularly in its lower part, and/or at least partially into the processing gas is disposed inside the chamber of the fluidized bed, preferably above the fluidized bed, and/or at least partially used processing gas is given, preferably above the boiling layer, from the chamber of the fluidized bed.

In accordance with a preferred form of carrying out of the invention of the method in the chamber of the fluidized bed above the fluidized bed is actuated means for recycling at least partially converted into a fluidized bed processing gas, n is an example of an oxygen burner and/or an oxygen lance, moreover, at least in a partial disposal, particularly when the corresponding exothermic oxidation processing gas is allocated or consumed thermal energy.

In accordance with a preferred form of carrying out of the invention of the method of thermal energy is released or consumed above the fluidized bed in the chamber of the fluidized bed.

In accordance with a preferred form of carrying out of the invention of the method allocated or consumed above the fluidized bed thermal energy is introduced into the chamber of the fluidized bed or inferred from the chamber of the fluidized bed in the fluidized layer.

In accordance with a preferred form of carrying out of the invention of the method if necessary tool for the utilization of the processing gas located above the fluidized bed in the chamber of the fluidized bed for the disposal of the processing gas is injected oxidizing agent, for example oxygen and/or air directly into the chamber of the fluidized bed above the fluidized bed.

In accordance with a preferred form of carrying out of the invention of the method if necessary tool for the utilization of the processing gas located above the fluidized bed in the chamber of the fluidized bed, is burned, at least partially, in particular oxidized, at m is re, partially into the processing gas, such as the reduction gas, in the chamber of the fluidized bed above the fluidized bed.

Burning is a chemical reaction to generate heat, for example exothermic oxidation.

In accordance with a preferred form of carrying out of the invention of the method of the powdery source material that comes out of the fluidized bed and at least some time is above the boiling layer, accordingly partially heated or cooled through the processing gas existing above the fluidized bed in the chamber of the fluidized bed and at least partially disposed of, in particular, burned and/or oxidized and/or heated and/or with means for recycling gas processing.

In accordance with a particular form of execution of the relevant invention of the method in the chamber of the fluidized bed above the fluidized bed is the cyclone, and powdery source material in the cyclone area, in particular the inlet of the cyclone, heated or cooled through the processing gas existing above the fluidized bed in the chamber of the fluidized bed and at least partially disposed, in particular oxidized and/or heated and/or with means for recycling gas processing.

In the CE is provided with a special form of execution of the relevant invention of the method above the fluidized bed is heated or cooled powdery source material, at least partially introduced into the fluidized bed, in particular used a second time.

In addition, the invention relates to a device with the characteristics of claim 8 of the formula of the invention, it is preferable to implement the method according to one or more of claims 1 to 7 claims.

In accordance with a preferred form of carrying out of the invention device, means for recycling gas processing, adapted to enter a liquid and/or solid products of combustion, preferably oxidant, particularly preferably oxygen and/or air, is installed in the chamber of the fluidized bed above the fluidized bed.

In accordance with a preferred form of carrying out of the invention the device is a means for the disposal of the processing gas located above the fluidized bed in the chamber of the fluidized bed, is located in the field zone of the spray so that he powdery source material in the zone of the spray by means and/or by at least partially disposed, in particular oxidized and/or heated processing gas at least partially heated or cooled.

The area of the spray means when the portion of the free space above the fluidized bed (fluidized) layer, which emits IU is such solid particles, which then at least partially again fall back into the fluidized bed.

In accordance with a particular form of execution corresponding to the invention of the device, it contains the cyclone, which is located above the fluidized bed in the chamber of the fluidized bed, and to the outlet of the cyclone adjacent under certain conditions, the so-called diples, which is immersed in the fluidized bed, and, in addition, a device for recycling processing gas located above the fluidized bed in the chamber of the fluidized bed at the level of the cyclone, in particular at the level of the inlet of the cyclone, and powdery source material in the cyclone area, in particular its inlet, at least, is heated or cooled by named means and/or by at least partially disposed, in particular oxidized, heated processing gas.

The so-called diplex represents in accordance with a special form of execution of the invention the device for reverse movement of the substances precipitated in the cyclone, fluidized bed.

In various ways the recovery fluidized bed loaded ore is heated and is recovering in a counter 3-4 reactors fluidized bed. This sets the temperature profile due to the reducing gas enthalpy and heat reactions.

The poet is the change in thermal regime in the appropriate way is possible only within narrow limits.

The prior art external heating of the reducing gas, however, such heating is uneconomical. Partial combustion of reducing gas to the fluidized bed degrades its reduction potential and together with the recovery effect.

In numerous experiments on the use of burners, in particular oxygen burners, fluidized bed units, it was found that, in General, by high concentrations of particles in the fluidized bed unit in the area of the flame occurs setting of cuttings inside, which destabilizes the process in a fluidized bed. In addition, this area is very difficult to implement a reliable flame monitoring and adaptation to facilitate ignition.

Thanks to the present invention is achieved by optimisation of the energy balance, especially energy consumption.

For implementing the method according to the invention above the fluidized bed is established in accordance with a special form of execution of the invention, at least one oxygen burner to raise the temperature of the fluidized bed. Compared with traditional burners corresponding to the invention the oxygen burner is characterized by the fact that the combustion, in particular the oxidation processing gas, in particular reducing gas, is carried out before the oxygen burner at the e in the chamber of the fluidized bed. Oxygen burner represents in its most simple form, perform the nozzle (nozzle for feeding an oxidant into the chamber of the fluidized bed.

In accordance with a particular form of execution of the relevant invention of the method the concept of the oxidizer includes all oxygen-containing materials and all materials, provide oxygen and/or releasing in the chamber of the fluidized bed, under the existing environmental conditions for at least partial oxidation of the processing gas and/or powdery source material, in particular, pure oxygen and/or air.

In accordance with a special form of execution of the invention, due to the removal of particles from the fluidized bed, the particles in the free space above the fluidized bed is heated by oxygen burners and then settle back into the fluidized bed.

In accordance with a special form of execution of the invention the particles or dust that is heated, then is precipitated in the cyclone under certain conditions, and again in the fluidized bed.

Unlike heating gas to the fluidized bed in accordance with a particular form of execution of the invention is represented by the regenerative potential of the reducing gas is reduced only in a fluidized bed. As a consequence, the reduction potential of the gas may be used to stand the high temperature layer. High temperature gas at the flow of the working gas in the reactor is not required. Thus, decrease well-known problem of occurrence of soot on the discharge header.

Further minimizes the risk zashlakovyvaniya in the field of fluidized bed or chamber of the fluidized bed due to the low concentration of particles in the region of the flame.

The following specific advantages can be realized through the invention:

- effective and simple control of the flame and a means to facilitate ignition;

- better and more uniform processing, in particular recovery by increasing the boiling temperature (fluid) layer at almost the same as the processing gas;

- effective and easy regulation of the temperature profile of the fluidized bed;

- longer service life distribution manifold;

- better performance due to higher efficiency of fluidization.

Especially effective installation according to the invention for use in a method with multiple parallel and/or sequentially formed fluidized layers, as in this case, a separate fluidized layers may be coordinated with one another in relation to the temperature regime is particularly flexible.

In accordance with a particular form of execution from which retene is possible to carry out the reaction in a fluidized bed, for example, the reaction of the recovery powder of metal oxide, prior to further utilization of the processing gas, for example, partial combustion, and despite it controls the temperature in the fluidized bed, in particular through the returned particles, preferably powdery source material.

The return is in accordance with a particular form of the invention, on the one hand, by returning from a cyclone, for example through the so-called diples, and/or, on the other hand, through sedimentation of particles ejected from the fluidized bed. In accordance with these forms of execution is achieved by heating the fluidized bed, although the processing gas is not given effect before the reaction in a fluidized bed or during it.

The invention in accordance with a particular form of execution represented using schematic drawing, which shows a method for processing a powder, in particular containing the metal source material.

The drawing shows a device 1 for creating a fluidized bed, for example a fluidized-bed reactor, which has an air chamber 2 and the chamber of the fluidized bed to the fluidized bed 4 with the free space 5. In addition, the device 1 has a distribution manifold 3 for the distribution of the processing gas 6, in particular restore the nutrient gas.

In the device 1 is supplied through the pipe 8 powdery source material, in particular iron oxide, which, at least partially processed form out through the pipe 9 with the other hand.

The device 1 is the cyclone 10, and the so-called diplex 11, which serves for separating dust or powder source material and that their returns in the fluidized bed 4. Fluidized bed 4 behaves as known to the expert, similar to a boiling liquid and limited, although inaccurately, by certain presented on figure 1 schematically, surface. Directly above this inaccurate boundary is the so-called zone of the spray, which is characterized by the fact that in it there are small particles that are emitted from the fluidized bed and then settled back.

In the chamber of the fluidized bed above the fluidized bed 4 is an oxygen burner 12 for the supply of oxygen 13 into the chamber of the fluidized bed. In accordance with a special form of execution of the invention the oxygen burner is in the area of spray (as shown in figure 1) or serves to direct heat in the area of spray. Particle 16 is heated by an oxygen burner 12 in the zone of the spray before it settles back into the fluidized bed, and therefore also contributes to the heating of the layer.

In compliance is another form of the invention in the region of the cyclone 10, especially in the area of the inlet of the cyclone, provided by the burner 14 for the supply of oxidizer 15.

Thus, the processing gas is burned in the chamber of the fluidized bed and above the boiling layer 4 generates heat, which, for example, due to the solid particles separated in the cyclone 10 and supplied through a so-called diplegia 11, is used directly for heating or heating of the fluidized bed 4.

By the arrow 17 graphically depicts the path of small solid particles from the fluidized bed 4 through the zone of contamination into the free space 5, which, respectively, by means of an oxygen burner 14 is heated and through the cyclone 10 and the so-called diplex 11 is returned into the fluidized bed 4.

Thus, at least partially, into the processing gas is discharged through line 7.

1. The method of processing a powder, in particular metal-containing source material, and source material and the processing gas, in particular the reducing gas is injected to obtain a fluidized bed in the chamber of the fluidized bed, for example, in a fluidized-bed reactor, and in the chamber of the fluidized bed above the fluidized bed is cyclone, characterized in that the processing gas, at least after partial conversion in fluidized bed away from the fluidized bed and then out of the fluidized bed, less than the least partially disposed of, preferably oxidized in a chemical reaction, in particular exothermic, with a reagent, preferably with gaseous and/or liquid oxidizer, and in the chamber of the fluidized bed above the fluidized bed actuate the means for recycling at least partially converted into a fluidized bed processing gas such as an oxygen burner and/or an oxygen lance, and thermal energy of a chemical reaction is injected at least partially in the chamber of the fluidized bed, in particular in a fluidized bed, or derive from it, and powdery source material in the cyclone area, particularly the inlet of the cyclone, heated or cooled due to the available processing gas at least partially disposed above the fluidized bed in the chamber of the fluidized bed, in particular heated or cooled, and/or with means for recycling gas processing.

2. The method according to claim 1, characterized in that the fluidized bed is formed in part of the chamber of the fluidized bed, in particular in the lower part and at least partially into the processing gas is disposed inside the chamber of the fluidized bed, preferably above the boiling layer, and at least partially used processing gas, preferably above the fluidized bed, away from the chamber of the fluidized bed.

3. Pic is b according to claim 1 or 2, characterized in that thermal energy to produce or consume above the fluidized bed in the chamber of the fluidized bed.

4. The method according to claim 1 or 2, characterized in that the means for the disposal of the processing gas located above the fluidized bed in the chamber of the fluidized bed, if necessary, introduce the oxidant, for example oxygen and/or air for recycling processing gas directly into the chamber of the fluidized bed above the fluidized bed.

5. The method according to claim 1, characterized in that by means of the device for utilization of the processing gas above the fluidized bed in the chamber of the fluidized bed of at least partially into the processing gas, in particular the reduction gas, optionally, at least partially burned, in particular, at least partially oxidized in the chamber of the fluidized bed above the fluidized bed.

6. The method according to claim 1, characterized in that the powdery source material that leaves the fluidized bed and at least partially located above the fluidized bed, if necessary, is heated or cooled by means of available processing gas at least partially disposed above the fluidized bed in the chamber of the fluidized bed, and/or with means for recycling gas processing.

7. The method according to claim 5 or 6, characterized in that the hot or cold Poroskov asny source material, above the fluidized bed, at least partially injected into the fluidized bed.

8. A device for processing a powder, in particular metal-containing source material, for example, to restore powdered iron oxide in a fluidized bed, which contains a distribution manifold (3) to distribute the processing gas, in particular reducing gas, the pipe (8) for the supply, particularly psevdoozhizhennogo, powdery source material, in particular a powder of a metal oxide, a conduit (9) to remove the processed source material, the pipe (6) for supplying a processing gas pipe (7) to exhaust the processing gas, the camera (1) fluidized bed to create a fluidized bed (4), cyclone (10), which is located above the fluidized bed (4) in the chamber (1) of the fluidized bed, and to the outlet of the cyclone adjacent diples (11)immersed in the fluidized bed (4), characterized in that in the chamber of the fluidized bed above the fluidized bed (4) is provided by the tool (12) for recycling at least partially into the processing gas of the fluidized bed, through which is fed to the fluidized layer (4) or removed from him for thermal energy, and a means for recycling processing gas located above fluidized bed (4) in the chamber (1) of the fluidized bed, is located on the Aries cyclone (10), in particular, the inlet of the cyclone, and powdery source material in the cyclone area (10), in particular the inlet of the cyclone, is heated or cooled by means of (12) and/or through the processing gas at least partially disposed, in particular oxidized.

9. The device according to claim 8, characterized in that the means for the disposal of the processing gas located in the chamber (1) of the fluidized bed above the fluidized bed, is intended for the introduction of liquid and/or solid oxidizing agent, preferably oxygen, particularly preferably oxygen and/or air, into the chamber of the fluidized bed.

10. The device according to claim 8 or 9, characterized in that the means for the disposal of the processing gas located above the fluidized bed in the chamber of the fluidized bed, is located in the field zone of the spray particles of the fluidized bed so that the powdery source material, in the splash zone, is heated or cooled through the device and/or by at least partially disposed, in particular oxidized, the processing gas.



 

Same patents:

FIELD: non-ferrous metallurgy; methods and devices for thermal treatment of the powdery materials.

SUBSTANCE: the invention is pertaining to the technology of reprocessing of the powdery materials, predominantly, the aluminum hydroxide. The method provides for: drying of the aluminum hydroxide by the ascending gases; the aluminum hydroxide cyclone separation; its preheating in the stream of the effluent gases; its feeding into the reaction chamber; the individual preparation of the mixture of the combustion products of the fuel and the air;

Baking of the aluminum hydroxide in the suspension state by the mixture of the fuel combustion products and the oxygen-containing gaseous phase; the cyclone separation of the aluminum oxide; the multi-stepwise cooling by the air with production of the commercial aluminum oxide. Baking of the aluminum hydroxide and the aluminum oxide cooling conduct in two stages. At that the baking at the initial stage conduct using the separately prepared mixture of the combustion products consisting of a part of the fuel and the consumable for the baking and used at the final stage of the aluminum oxide cooling; and the baking at the final stage is realized by the prepared directly in the reaction chamber mixture of the combustion products from the remained part of the fuel and the gaseous-powdery phase enriched with the air used at the initial stage of cooling of the aluminum oxide. The installation contains: the device for the aluminum hydroxide drying; the cyclone separator; the device for the preliminary direct-flow heating of the aluminum hydroxide; the reactor for the aluminum hydroxide baking, which is supplied with the air blower for the air feeding into the burners and contains the cylindrical reaction chamber with the conical bottom and the lower side holes for the material feeding, the lower central hole for the gaseous heat carrier feeding, the upper outlet opening for the gaseous-powdery mixture and the burner device located in the lower part of the reaction chamber and fulfilled in the form of the cylindrical prechamber supplied with the burners uniformly arranged on its surface and having the upper central outlet opening for the mixture of the combustion products and coupled with the lower central inlet opening of the reaction chamber. At that the prechamber is coaxially connected to the lower part of the reaction chamber; the cyclone separator of aluminum oxide, the multi-stepwise cyclone device for cooling the aluminum oxide, supplied with the blower for the air supply to the reactor; the smoke exhaust for removal of the effluent gases and connecting the pipe ducts. According to the invention the reaction chamber contains: the side radially mounted branch-pipes for the air arranged under the lower side inlet holes for the material; the burners radially mounted along the cylindrical surface of the middle part of the reaction chamber; the burners device has the lower tangential inlet branch-pipes for the air, and the prechamber burners are installed radially. The installation is additionally supplied with the device of cooling of the aluminum oxide and the blower for the air supply to the reactor connected with the cyclone separator of the aluminum oxide and with the inlet branch-pipe of the cyclone of the additional device of cooling, the outlet branch-pipe of which is connected with the lateral radially installed in the reaction chamber branch-pipes for the air. At that the inlet branch-pipe of the multi-stepwise device of cooling of the aluminum oxide is connected with the lower tangential branch-pipes for the air, and the inlet branch-pipe of the cyclone of the first step of the multi-stepwise device is connected to the pipe duct for feeding of the aluminum oxide from the additional device of cooling. The invention provides the improvement of the quality of the produced aluminum oxide and profitability of the production process.

EFFECT: the invention ensures the improvement of the quality of the produced aluminum oxide and profitability of the production process.

3 cl, 3 dwg, 1 tbl

FIELD: non-ferrous metallurgy.

SUBSTANCE: method comprises steps of feeding under hearth of furnace (gaseous) nitrogen; setting firing temperature for predetermined composition of charge; stabilizing designed values of charge flow rate in fluidized bed, air flow rate or air pressure under hearth of furnace necessary for normal operation of fluidized-bed furnace; then measuring error of calcine temperature in fluidized bed relative to preset temperature value and simultaneously changing flow rates of air and nitrogen supplied under hearth of furnace for completely suppressing error of measured temperature while sustaining preset pressure of gas-air mixture under hearth of furnace. Furnace is arrested due to lowering preset temperature of calcine in fluidized bed according to condition of completely interrupting firing process of all fractions of charge in fluidized bed.

EFFECT: enhanced operational reliability of all units of furnace.

1 dwg

FIELD: nonferrous metallurgy.

SUBSTANCE: invention related to production of magnesium by electrolysis of melted raw material, particularly, to dehydration of carnallite raw material in fluidized bed furnace. Invention is aimed at provision of constant flow rate of gases and prevention of clogging of caps by processes material and mixtures present in gases. Proposed gas distributor cap fluidized-bed furnace includes hearth with holes and caps installed in hearth holes. Novelty is that caps are fitted in hearth holes with clearance for displacement in vertical plane, being made in form of head and guided support provided with support height lifting limiter from bottom. Moreover, guide support of cap be made in form of tube with slots arranged under flay disk or in form of angle plate or in form of arc, and height of lifting of guide support is 1-10 mm. Wire, clamp or split pin can be used as support lifting height limiter. Ratio of diameter of hole in hearth to diameter of head of cap is 1:(1.1-1.8), clearance between wall of hole and guide of support is not less than 0.5 mm. Head of cap can be made in form of flat disk or sphere without holes.

EFFECT: increased capacity of gas distributor cap and furnace as a whole and service life of furnace, reduced labor input in making of caps.

9 cl, 1 ex, 4 dwg

FIELD: metallurgy.

SUBSTANCE: furnace comprises valving members provided with the cylindrical branch pipes at its inlet and outlet, hopper for limestone, two zones for heating limestone, zone for roasting the limestone, zone for cooling lime, and hopper for lime. The axes of the branch pipes are inclined at an angle of 38-35° to the horizon and are inclined one to the other at an angle of 52-90°. The projections of the extensions of the axes of the branch pipes intersect on the surface of the gas distributing screens at a distance of 0.256-0.375 of the diameter of the zones from their center.

EFFECT: reduced fuel consumption.

4 dwg, 1 tbl

FIELD: method for producing of metallurgical fluxes in fluidized bed, may be used in production and processing of cast iron and steel outside furnace.

SUBSTANCE: method involves providing heating and calcinations of crude material in heating, calcination and cooling zones of multiple-zone fluidized bed furnace; introducing fluxing iron-aluminum containing admixtures or mixtures thereof; heating crude material in first heating zone for 0.5-20.0 min to temperature of 300-450 C and holding for 20.0-39.5 min; heating crude material in second heating zone for 0.5-22.5 min to temperature of 500-750 C and holding for 22.5-44.5 min; heating crude material in calcination zone to temperature of 920-940 C for 0.5-45.0 min and calcining for flux for 45.0-89.5 min; cooling flux in cooling zone for 0.5-35.5 min to temperature of 250-400 C and holding for 30.0-65.0 min; introducing admixtures into space under grid and/or into space above layer of heating zones at temperatures of 350-450 C and/or 500-750 C and/or 250-400 C, respectively. Method allows weight part of MgO to be increased by 5.0-11.0% and of (CaO+MgO) by 4.0-11.0%, weight part of PMPP to be reduced by 4.0-8.0% and of admixture by 0.3-0.7%.

EFFECT: improved quality of calcinations of polydispersion carbonate magnesian crude material.

2 cl, 6 dwg, 1 tbl

FIELD: metallurgy.

SUBSTANCE: method of automatic control of metallurgic raw material roasting in boiling layer furnace provided with premix chamber is based upon measurement of charge consumption, blowing discharge or blowing pressure value under furnace hearth and under premix chamber hearth, measurement of value of deviation of charge consumption from its preset value and upon difference in blowing pressure under premix chamber hearth and furnace hearth. The difference is simultaneously corrected for value of deviation of charge consumption from its preset value. Blowing pressure under premix chamber hearth is subjected to change proportionally to pressure difference.

EFFECT: improved efficiency of control.

2 dwg

FIELD: roasting.

SUBSTANCE: device comprises horizontal metallic perforated plate mounted in the cylindrical housing. The plate is perforated with openings made of overturned trancated cone. The difference of the diameters of the top and bottom bases of the cone is (0.2-2.15)h, where h is the thickness of the plate. The plate is provided with the peripheral non-perforated ring secured in the ring-shaped member having C-shaped cross-section. The member is made of three coincident metallic rings that abut against the housing and can move with respect to the bottom and top rings and with respect to the intermediate ring of the member within the temperature gap. The top bearing ring is mounted for permitting movement with respect to the housing. The ring is provided with the metallic cylindrical insert that points upward and abuts against the lining. The perforated section of the plate between the openings is provided with stiffening ribs directed downward.

EFFECT: expanded functional capabilities.

3 cl, 1 tbl

FIELD: nonferrous metallurgy; preparation of chloromagnesium raw material for electrolysis to produce metallic magnesium and chlorine.

SUBSTANCE: the invention is pertaining to nonferrous metallurgy, in particular to preparation of chloromagnesium raw material for electrolysis to produce metallic magnesium and chlorine. The method of dehydration of chloromagnesium raw material includes consecutive dehydration of chloromagnesium raw material in multichamber furnaces of a boiling layer by the chimney gases produced at combustion of a mix of natural gas, air and chlorine in a furnace extension of the furnace and fed through a small angle into the layer; chilling by air of the cavity of the small angle and the bottom of the gas-distributing grate, trapping of the exhaust gases. The furnace gases and air used for chilling in the small angle are fed separately. At that air is used for continuous chilling of the upper part of the small angle above a partition and the heated in the small angle air is fed to mixing with the chimney gases. The device for dehydration of the chloromagnesium raw material includes a multichamber furnace of the boiling layer consisting of the furnace body with branch-pipes for the raw material input and output, withdrawal of a finished product with partitions, forming the cambers, a gas-distribution grate in the form of bottom with holes, with an air-cooled torsion box and the gas-distribution caps in the form of the hollow angle located above the horizontal row of the holes of the bottom, a furnace extension and cyclones. The device in addition has a partition rigidly mounted inside the small angle and dividing it in height into the upper and the lower parts. In the lower part of the surface of the small angle there are windows for outlet of the chimney gases, and the ribs of the small angle are rigidly attached to the bottom. At that the windows of the small angle are placed on the same axis with the holes, and each row of the windows is shifted in respect to each other. The invention allows to increase productivity of the device.

EFFECT: the invention ensures increased productivity of the device.

7 cl, 3 dwg, 1 ex

FIELD: constructions of fluidized bed furnaces for endothermic roasting of polydispersed materials and grained carbonate rocks, applicable in metallurgical, chemical and construction branches of industry.

SUBSTANCE: the gas-distributing hearth of the roasting zone of multizone fluidized bed furnace for roasting of limestone is set up of burners. Each burner is made in the form of an air scoop with a central hole, in which a gas-delivery pipe with a side hole is installed with a clearance. The air scoops are made perforated. The gas-delivery pipes are installed for coaxial displacement. The effective linear parameter of the hearth P=(N·D1·D2·D3 /D4·D5·D6)1/3 makes up 0.14 to 1.42, where N=(J·D21/D20)1/3 - linear coefficient of perforation of air scoops; J=n·D20/D21-free cross-sectional area of the hearth; n-quantity of holes in the scoops, D0-diameter of scoop holes; D1-hearth diameter; D2-diameter of the gas-delivery pipe; D3 - diameter of particles of roasted limestone; D4 - distance between the gas-delivery pipes; D5 - diameter of the scoop; D6 - distance between the centers of the scoops.

EFFECT: reduced specific consumption of fuel and cost of lime.

4 cl, 1 dwg, 1 tbl

FIELD: powder metallurgy, possibly production of finely dispersed powder of molybdenum, its composites with tungsten, namely for producing hard alloy materials on base of molybdenum and tungsten.

SUBSTANCE: method provides production of molybdenum and its composites with tungsten at temperature no more than 900°C and also production of materials in the form of finely dispersed powders. Method comprises steps of reducing compounds of molybdenum and tungsten (MoO3 and WO3) by metallic magnesium in medium of melt chlorides such NaCl, KCl or carbonates such as Na2CO3, K2CO3 or their binary mixtures such as NaCl - KCl, Na2CO3 - K2CO3, NaCl - Na2CO3, KCl - K2CO3 at temperature 770 -890°C. According to results of fineness analysis produced powder of molybdenum represents homogenous material having 80% of particles with fraction size 2.2 - 3 micrometers. Composition material depending upon Mo content includes particles with fraction size 5 - 15 micrometers.

EFFECT: enhanced efficiency of method.

1 tbl, 3 ex

FIELD: non-ferrous metallurgy, possibly production of highly purified powders of tantalum and niobium with large specific surface by metal thermal reduction.

SUBSTANCE: method is realized at using as corrosion protection means layer of halide of alkali metal formed on inner surface of vessel before creating in reaction vessel atmosphere of inert gas. Charge contains valve metal compound and halide of alkali metal. It is loaded into reaction vessel and restricted by protection layer of halide of alkali metal having melting temperature higher than that of charge by 50 - 400°C. Before loading charge, valve metal compound and alkali metal halide may be mixed one with other. Mass of protection layer of alkali metal halide Ml and charge mass Mc are selected in such a way that that to satisfy relation Ml = k Mc where k - empiric coefficient equal to 0.05 - 0.5. Gas atmosphere of reaction vessel contains argon, helium or their mixture. Fluorotantalate and(or) oxyfluorotantalate or fluoroniobate and(or) oxyfluoroniobate of potassium is used as valve metal compound. Sodium, potassium or their mixture is used as alkali metal. Chloride and(or) fluoride is used as alkali metal halide. Valve metal compound and alkali metal halide may contain alloying additives of phosphorus, sulfur, nitrogen at content of each additive in range 0.005 - 0.1% and 0.005 - 0.2% of mass valve metal compound respectively. Invention lowers by 1.3 - 2 times contamination of powder with metallic impurities penetrating from vessel material. Value of specific surface of powder is increased by 1.2 - 1.8 times, its charge is increased by 10 - 30 %, leakage current are reduced by 1.2 - 1.5 times.

EFFECT: improved quality of valve metal powder, enhanced efficiency of process due to using heat separated at process of reducing valve metal for melting protection layer.

9 cl, 1 tbl, 4 ex

The invention relates to the metallurgy of tungsten, in particular the production of metallic tungsten from wolframalpha compounds, in particular SelidovUgol concentrate
The invention relates to powder metallurgy and can be used to obtain powder for capacitor production

The invention relates to ferrous metallurgy and can be used to obtain alloy powders of tantalum or niobium
The invention relates to metallurgy, in particular, to obtain granules and powders of rare and radioactive metals and their alloys

The invention relates to ferrous metallurgy and can be used to obtain high-purity powders of tantalum and niobium with a large specific surface for the production of capacitors

The invention relates to powder metallurgy and can be used to obtain high-purity powders of tantalum and niobium with a large specific surface for the production of capacitors
The invention relates to the field of powder metallurgy and concerns a method for obtaining powders of refractory compounds on the basis of a carbide or nitride of titanium compounds that can be used for the production of cutting tools, metal fittings, etc

The invention relates to the production of powders of refractory metals and can be used in enterprises: non-ferrous metallurgy in the production of high-quality hard alloys; chemical industry for preparation of catalysts; the electronics industry in the manufacture of bodies glow and so on

FIELD: non-ferrous metallurgy, possibly production of highly purified powders of tantalum and niobium with large specific surface by metal thermal reduction.

SUBSTANCE: method is realized at using as corrosion protection means layer of halide of alkali metal formed on inner surface of vessel before creating in reaction vessel atmosphere of inert gas. Charge contains valve metal compound and halide of alkali metal. It is loaded into reaction vessel and restricted by protection layer of halide of alkali metal having melting temperature higher than that of charge by 50 - 400°C. Before loading charge, valve metal compound and alkali metal halide may be mixed one with other. Mass of protection layer of alkali metal halide Ml and charge mass Mc are selected in such a way that that to satisfy relation Ml = k Mc where k - empiric coefficient equal to 0.05 - 0.5. Gas atmosphere of reaction vessel contains argon, helium or their mixture. Fluorotantalate and(or) oxyfluorotantalate or fluoroniobate and(or) oxyfluoroniobate of potassium is used as valve metal compound. Sodium, potassium or their mixture is used as alkali metal. Chloride and(or) fluoride is used as alkali metal halide. Valve metal compound and alkali metal halide may contain alloying additives of phosphorus, sulfur, nitrogen at content of each additive in range 0.005 - 0.1% and 0.005 - 0.2% of mass valve metal compound respectively. Invention lowers by 1.3 - 2 times contamination of powder with metallic impurities penetrating from vessel material. Value of specific surface of powder is increased by 1.2 - 1.8 times, its charge is increased by 10 - 30 %, leakage current are reduced by 1.2 - 1.5 times.

EFFECT: improved quality of valve metal powder, enhanced efficiency of process due to using heat separated at process of reducing valve metal for melting protection layer.

9 cl, 1 tbl, 4 ex

Up!