Composition and method for producing of dinas refractory

FIELD: refractory industry, in particular dinas refractory for cladding of glass-melting furnace, arc-furnace, cold-charge furnace, coking plant etc.

SUBSTANCE: invention relates to batch composition and method for production of dinas refractory. Claimed batch contains (mass %) highly refined flaked slates ≤0.4; iron-lime mixture of grade ≤0.09 mm and graded crystal quartzite of grade ‹0.5 mm 44-57 in total, including grade ‹0.09 mm 24-36; grade of 0.5-2.0 mm 12-55; and grade of 2-3.2 mm ≤28. Method includes feeding of batch components, mixing, press forming of articles, drying at 50-2200C, annealing at 1200-14500C for 90-112 h, and holding at 1375-14500C for 2-88 h. Then dinas bodies are cooled for 46-132 h.

EFFECT: finished materials with improved refractory quality and reduced toxic burning products of adhesive.

13 cl

 

The invention relates to refractory industry, in particular to proizvodstvu silica refractories for lining glass, electric arc furnace, open-hearth furnaces, hot blast stoves for blast furnaces, coke oven batteries.

Known composition and a method of manufacturing silica refractories of silica mixture, wt.%: Deposit the mixture of dry powders of crystalline quartzite, including particles less than 0.5 mm 44-5, including particles less than 0.09 mm 24-35; fraction of 0.5,0 mm 7-3, fractions of 1.0-,0 mm 18-6, faction 2-0 mm 8-5, fraction of more than 3.0 mm to 3; a flame-retardant additive (silica battle - marriage products) to 4, lime-iron formula (IH) 1,6-5,4 (dry residue in excess of 100% quartzite charge), including lime-iron mineralizer of 1.0 to 4.2, consisting of milk of lime and ferrous additives, adhesive sulfite-alcohol bard (PRS) - 0,6-1,2. The components of the mixture is dosed by weight, dry crystalline quartzite with refractory additives stirred for 2-3 minutes, the resulting mass is poured lime-iron mineralizer and the PRS, the mass is stirred, the resulting mass humidity 3-7% molded articles in the press until the apparent density suzeormanshow raw 2,22-2.4 g/cm3, is dried at a temperature of 100-80°C for 8 hours, heated to a temperature of 700°C 22 hours, heated at a temperature of 700°C-1000°C is 24 hours, calcined at a temperature of 1000-1430°C aged at a temperature of 1350-1430°C for 31 hours, cooled silica product to a temperature of 300°To 27 hours, and from 300°C to 50°C - 25 hours [1].

The disadvantages of the composition and uses of fractions of crystalline quartzite in the dry state, the use for the preparation of the silica mass marriage silica products, which reduces the resistance of the products, and lime-iron of the mineralizer and the PRS in the form of a suspension.

The disadvantage of this method is in use for the preparation of the silica mass of these components in a state of low adsorption activity with respect to each other, which leads to increased consumption of adhesive (PRS). At 150°C the dispersed particles of the PRS pass from solid softened in a viscous state and impede the escape of moisture from the products, and at 250°C the PRS becomes brittle, which reduces the strength of crude in the range of 150-250°C. in Addition, the PRS is valuable for further processing product containing sugar and carbon components, which burn out during processing and thereby pollute the environment. Furthermore, the method does not include the use of heat of hydration of lime, which requires storage of the components of the mixture in a heated room at negative ambient temperatures. For pumping Vya is some PRS requires a powerful piston pumps, developing pressure 5-8 bar., and, in addition, optionally, the PRS is heated by steam to 50-60°C.

The aim of the invention is to remedy these disadvantages.

This is achieved in that for the manufacture of silica products used hydrated crystalline quartzite, wet refractory clay and BOF sludge, gelatinization lime-iron formula (IH), consisting of slaked lime, Converter sludge and aqueous adhesives (lignosulfonate) - product deep processing of the PRS. In addition, depending on the conditions of service of the proposed compositions of the silica mass and technology of silica refractories.

In the manufacture gelatinizing lime-iron mixture in gaeldom drum continuous action and subsequent grinding her ball mill is the liming aqueous solution of lignosulfonate and moisture from BOF sludge with the evolution of considerable heat. At elevated temperatures (50-90°C) and subsequent exposure of the mixture within 8-9 hours is the gelatinization of lignosulfonate, the wetting of the surfaces of the granules of hydrated lime and Converter sludge, the interaction of lignosulfonate at the molecular level with the surface of the particles of the charge, which leads to hardening of the resulting granules at granular the processes in the individual housing and forming raw. In the process of joint grinding hydrated crystalline powders quartzite, refractory clay, BOF sludge and IH in the faucets are formed hydrosilicate calcium, which is partly being in a colloidal state, interact with colloidal lignosulfonate, which gives the mass connectivity and adobeforums. The limy dough, colloidal lignosulfonate and refractory clay contribute to the accumulation of fine grains at large and thereby homogenizing mass. This increases by 1.2-1.5 times the adhesive properties of IH and strength sizeofimage raw, which allows to reduce the consumption of lignosulfonate in 1,5-2 times (up to 0.4-06% of dry matter) and harmful emissions into the environment.

The invention described in this application, unlike the prototype, provides for the composition of the mixture for the manufacture of silica refractories containing powders fractional crystalline quartzite humidity 1,6-2,5%, fine lamellar slates, lime-iron mixture at the rate of introduction of the silica mass of 0.2 to 3.0 Cao, 0,2-1,2 Fe2About3and including, wt.% 3,0-12,6 slaked lime, 1,0-4,2 Converter sludge moisture content of 10%, to 0.6 in the dry residue of an aqueous solution of lignosulfonate density of 1.14-1.24 g/cm, up to 2 refractory clay with a moisture content of 12%, fire resistance of not less than 1670°With mass fractions of Al2About3not less than 30%,in the following ratio of the components of the charge, wt.%:

fine plate slates to 0.4

the specified lime-iron mixture

fractions less than 0.009 mm

in excess of 100% quartzite mixture: 1,4-4,8

crystalline quartzite next

fractional composition of the rest;

fractions of less than 0.5 mm 44-57%,

including particles less than 0.09 mm 24 -36%,

fractions of 0.5-2.0 mm 12-55,

fractions 2-3,2 mm to 28.

A method of manufacturing silica refractories includes mixing the components of the mixture according to claim 1, forming the mass of the moisture content of 4.5 to 8.0% on the press at specific pressure 30-55 MPa number of beats no more than 3 to obtain the apparent density of the freshly-formed raw 2,22-2.4 g/cm3, drying at a temperature of 50-20°C for 12-72 hours, subsequent calcination at a temperature of 1200-1450°C for 90-112 hours exposure at 1375-1450°C for 2-88 hours and cooled during 46-132 hours. The components of the mixture is dosed by weight, the powder of hydrated crystalline quartzite mix for 2-3 minutes, add in the mass of refractory clay and BOF sludge, mixed for 3 minutes, the resulting mixture is injected lime-iron mixture, the mixture with a moisture content of 3.8-3% is stirred for 3-4 minutes, the resulting mass is poured an aqueous solution of lignosulfonate density of 1.15-1.20 g/cm3and mix for 3-4 minutes, the resulting mass humidity and 3.8% molded articles in the press at specific pressure 3-55 MPA, with the number of strokes (clamps) when pressing more than 3 to the apparent density of the freshly-formed raw 2,22-,4 g/cm3, is dried at a temperature of 50-20°C and calcined at a temperature of 1200-1450°C 90-112 hours exposure at 1375-1450°C 2-88 hours, cooled silica products 46-132 hours.

Effect: the proposed composition and a method of manufacturing silica refractories eliminate the disadvantages of the prototype, reduce the consumption of toxic during the burnout adhesive - lignosulfonate.

This is because in shredded, moistened and mixed crystalline quartzite added pre-cooked IH, containing hydrate of calcium oxide in the form of the limy test, iron-containing additive of Converter sludge and adhesive additive is an aqueous solution of lignosulfonate. Lime putty and adhesive additives contribute to the accumulation of fine grains of quartzite, BOF sludge and lime on large grain and thus homogenization of the silica mass.

When the mass is mixed with a moisture content of 3.8-3% there is a uniform distribution of components throughout its volume. Fine particles of quartzite, refractory clay, BOF sludge and lime fill the space between grains of quartzite (linked colloidal micelles of lignosulfonate, refractory clay and calcium hydrosilicate) and, in the best of the e from the prototype, do not migrate to the surface of the products, so after drying and heat treatment of the products is guaranteed binding grains of quartzite each other, which improves the homogeneity properties of the refractories in the whole volume of the product.

Analysis of the data showed that the claimed technical solution achieved is not known from the prior art, and therefore it meets the criterion of “novelty.”

Such a technical solution is not obvious from the prior art and, therefore, meets the criterion of “inventive step”.

The claimed invention produces a positive effect, which is reflected in the fact that the composition of the mixture for the manufacture of silica refractories, unlike the prototype, containing powders of crystalline quartzite, refractory additives, lime-iron formula (IH), consisting of lime-iron of the mineralizer and glandular supplements, adhesive - PRS, stipulates that contains powders fractional crystalline quartzite humidity 1,6-2,5%, fine lamellar slates, lime-iron mixture, the rate of introduction of the silica mass of 0.2 to 3.0 Cao, 0,2-1,2 Fe2O3and including, wt.% 3,0-12,6 slaked lime, 1,0-4,2 Converter sludge moisture content of 10%, to 0.6, dry residue, an aqueous solution of lignosulfonate density of 1.14-1.24 g/cm32 about seuporno clay with a moisture content of 12%, fire resistance of not less than 1670°C, the mass fractions of Al2About3not less than 30%, in the following ratio of the components of the charge, wt.%:

fine plate slates to 0.4

the specified lime-iron mixture

fractions less than 0.009 mm

in excess of 100% quartzite mixture: 1,4-4,8

crystalline quartzite next

fractional composition of the rest;

fractions of less than 0.5 mm 44-57%,

including particles less than 0.09 mm 24-36%

fractions of 0.5-2.0 mm 12-55,

fractions 2-3,2 mm to 28.

Silica mixture for laying open hearth furnaces and heating units contains, wt.%, crystalline quartzite particles less than 0.5 mm 45-49, including particles less than 0.09 mm 26-30, fractions of 0.5-2.0 mm 33-55, fractions 2-3,2 mm - no more than 15, fine lamellar slates to 0.2, and further comprises a crystalline quartzite fraction more than 3.2 mm, not more than 3 wt.%.

Silica mixture for laying coke ovens contains, wt.%, crystalline quartzite particles less than 0.5 mm 44-57, including particles less than 0.09 mm 26-36, fractions of 0.5-2.0 mm 15-47, fractions 2-3,2 mm 9-23 and further comprises a crystalline quartzite faction over 3.2 mm, not more than 5, including: hearth products fraction less than 0.5 mm 44-48, including particles less than 0.09 mm 26-30, fractions of 0.5-2.0 mm 24-38, fractions 2-3,2 mm 18-23 and further comprises a crystalline quartzite fraction more than 3.2 mm, not more than 5.

Silica charge for the gasket glass furnaces contains, wt.%, crystalline quartzite particles less than 0.5 mm 46-50, including particles less than 0.09 mm 26-30, fractions of 0.5-2.0 mm 32-54, fractions 2-3,2 mm, no more than 15 refractory clay 0,8-1,2 on the dry matter, in excess of 100% silica mixture and further comprises a crystalline quartzite faction over 3.2 mm, not more than 3 wt.%.

Silica mixture for laying electric arc furnaces contains, wt.%, crystalline quartzite particles less than 0.5 mm 47-51, including particles less than 0.09 mm 28-32, fractions of 0.5-2.0 mm 35-53, fractions 2-3,2 mm, no more than 14, an aqueous solution of lignosulfonate density of 1.15-1.20 g/cm30,2-0,4 on dry matter, in excess of 100% silica mixture, refractory clay of 0.8-1.25 dry residue in excess of 100% silica mixture.

Silica mixture for masonry stoves blast furnace contains, wt%: crystalline quartzite particles less than 0.5 mm 47-51, including particles less than 0.09 mm 28-32, fractions of 0.5-2.0 mm 34-53, fractions 2-3,2 mm, no more than 14, an aqueous solution of lignosulfonate density of 1.15-1.20 g/cm30,2-0,4 on dry matter, in excess of 100% silica mixture, BOF sludge 1,2-2,1 on dry residue in excess of 100% silica mixture.

A method of manufacturing silica refractories vkluchaet mixing of the components of the mixture according to claim 1, forming the mass of the moisture content of 4.5 to 8.0% on the press at specific pressure 30-55 MPa number of beats no more than 3 to obtain the apparent density of the freshly-formed raw 2,22-2.4 g/is m 3, drying at a temperature of 50-20°C for 12-72 hours, subsequent calcination at a temperature of 1200-1450°C for 90-112 hours exposure at 1375-1450°C for 2-88 hours and cooled during 46-132 hours.

The components of the mixture for the manufacture of open hearth furnace, coke oven, hot air, glass, electric, complex tubular or kaskadnykh product is dosed by weight, the powder of hydrated crystalline quartzite mix for 2-3 minutes, add in the mass of clay and BOF sludge and mixed for 3 minutes, the resulting mixture is injected lime-iron mixture, the mixture with a moisture content of 3.8-6.3 percent stirred for 3-4 minutes, the resulting mass is poured an aqueous solution of lignosulfonate density of 1.15-1.20 g/cm3and mix for 3-4 minutes, the resulting mass humidity 4,5-8,0% molded articles in the press at specific pressure 30-55 MPa, with the number of strokes or the clamps when pressing more than 3 to the apparent density of the freshly-formed raw 2,22-2.4 g/cm3, is dried at a temperature of 50-220°C for 12-72 hours; shaped raw weighing more than 20 kg and particularly complex tubular or kaskadnye products pre-dried in natural conditions 2 to 4 hours, products weighing up to 8 kg dried at a temperature of 140-180°C for 12 hours, weighing from 8 to 20 kg at a temperature of 110-180°C for 16 hours, weighing 20-40 kg and especially SL is mportant tubular or kaskadnye products at a temperature of 60-90°C for 36 hours, product special difficulty weighing over 40 kg and products being formed by a mechanical hammers, dried at a temperature of 60-90°C for 72 hours, the dried product is calcined at a temperature of 1200-1450°C for 90-112 hours exposure at 1375-1450°C for 2-88 hours, cooled silica product within 38-132 hours.

Molded and dried products of normal size, the open-hearth furnace, coke oven, hot air, shaped with maximum weight, per garment, 16 kg heated and maintained at a temperature of 45±30°C for 2-4 hours at a temperature of 200±30°With 6-12 hours at a temperature of 420±20°C 14-32 hours at a temperature of 1000±30°With 16-32 hours at a temperature of 1150±15°With 6-12 hours at a temperature of 1190±15°C for 2-4 hours at a temperature of 1230±15°C for 2-4 hours at a temperature of 1260±15°With 2-4 hours at a temperature of 1320±15°C for 2-4 hours at a temperature of 1340±15°C for 2-4 hours at a temperature of 1360±15°C for 2-4 hours at a temperature of 1380-1395°C 2-88 hours, cooled to a temperature of 1000-1150°C 8-100 hours, to a temperature 350-250°C 22-48 hours, to a temperature of 80-40°C 16-32 hours.

Shaped raw weighing more than 20 kg and particularly complex tubular or kaskadnye products pre-dried in natural conditions 2 to 4 hours, dried products weighing up to 8 kg at a temperature of 140-180°C for 12 hours, weighing from 8 to 20 kg at a temperature of 110-180°C 16 hours, weighing 20-40 kg and particularly complex tubular or KOs the output of the product - at a temperature of 60-90°C 36 hours, product special difficulty weighing over 40 kg and products being formed by a mechanical hammers, - at a temperature of 60-90°C for 72 hours; fittings and hot-blast products with a maximum weight of 16 kg heated and maintained at a temperature of 45±30°C for 2-4 hours at a temperature of 180±20°With 14-52 hours at a temperature of 380±20°C for 8-24 hours at a temperature of 580±20°From 6-20 hours, at a temperature of 1260±20°C for 10-24 hours at a temperature of 1350±20°C for 2-4 hours at a temperature of 1375-1450°C 2-56 hours, cooled to a temperature of 530±30°With 20-92 hours, to a temperature of 60±35°From 10-20 hours.

Molded product is cooled to a temperature of 40°C 46-112 hours of silica mass humidity of 5.0-6.0% molded products to the apparent density of the raw freshly formed of 2.23-2.28 g/cm3including for products of normal size not below of 2.27 g/cm3, arched open hearth more 2.24 g/cm3, General purpose, glass furnaces, electric arc furnaces - more of 2.26 g/cm3; hot-blast stoves for blast furnaces: the Packed product more of 2.27 g/cm3wall and dome more of 2.26 g/cm3.

In the manufacture of coke oven products crystalline quartzite mixed with refractory clay 1.4 to 2.0 wt.% and Converter sludge of 0.45-0.7 wt.%, pour in an aqueous solution of lignosulfonate density of 1.15-1.20 g/cm30.2 wt.% on the dry matter, in excess of 100% quartzite W is hty, from the obtained mass humidity from 3.7 to 8.0% molded product.

In the manufacture of open hearth crystalline quartzite mixed with refractory clay 1.4 to 2.0 wt.% when the moisture content of the silica mass 5,0-8,0%, heavy products for masonry glass furnaces molded on a press equipped with a vibrator; before pressing difficult coke products on friction presses are powder lower front plate with a damp mass, sifted through a sieve with cell 0.2 mm; pressing raw complex and heavy products are produced on a base plate; special complex products are formed by mechanical hammers: in the form of fill mass to half height, condense on the perimeter, add weight above the top of the form and RAM, add weight and continue plugging with repeat operations from one to three times, moisturize molded raw, sprinkle a thin layer of sand its top.

The use of shredded moist crystalline quartzite, refractory clay, gelatinizing IH allows to obtain silica products with close to the prototype properties, but with a lower content of burnable when firing toxic adhesives.

The lower limit of moisture content of crushed quartzite of 1.6% due to the cost of removing the moisture, and the upper humidity limits crushed kV is rcito of 2.6%, refractory clay 12%, Converter sludge 10% tendency to perepisovatsya cracks in raw when it is forming. Lower limits of an aqueous solution of lignosulfonate 0.4% of the specified tensile strength of cotton, top 0,6 due to the provision of technological strength of molded product.

The upper limits of the fine lamellar shale 0.4% and lime-iron mixture of 2% due to lower fire resistance of the material.

The lower limits of the molding mass humidity of 4.5% on the press at specific pressure of 30 MPa to obtain the apparent density of the freshly-formed raw 2,22, drying at 50°C for 12 hours due to a sharp decrease in strength of raw sugar before baking.

Lower limits subsequent annealing at 1200°C for 90 hours exposure at 1375°C for 2 hours and cooled within 46 hours due to a sharp decrease in strength of the finished products.

The upper limits of the molding mass, moisture 8.0% at the press at specific pressure of 55 MPa with the number of strokes 3 to obtain the apparent density of the freshly-formed raw 2.4 g/cm3, drying at a temperature of 220°C for 72 hours due to increased energy costs and increased equipment wear when deterioration of the dimensional stability of raw sugar before baking.

The upper limits of the consequences of the subsequent firing at a temperature of 1450°C for 112 hours exposure at 1450°C for 288 hours and cooled for 132 hours due to the decrease in strength with increasing energy costs.

Optimal claimed range of components with a high level of thermo-mechanical properties of finished products for service in the metallurgical and thermal units for various applications.

Physico-chemical characteristics of materials silica refractories five compositions according to the invention for laying:

open-hearth furnaces and heat units - part 1;

coke ovens - part 2;

glass furnaces - part 3;

electric arc furnaces - part 4;

hot-blast stoves for blast furnaces - part 5

shown in table 1.

Table 1
The composition of

Indicators
12343
Mass fraction, %     
SiO2not less thana 94.294949693
CaO, not more than--3,02,0-
Fe2About3not less than--1,7-2,0
Al2O3not more than-   1,5-
Refractoriness, °C, min.1710 171017201690
Density, g/cm3not more than2,36-2,402,35-2,402,382,342,34-2,39
The open porosity, %, max16-24,220-702216,1-25,416,9-22,3
The limit of compressive strength, MPa215-715150-500200250-590270-700
The temperature of the beginning of deformation,°C, min.16501640164016601620
Additional growth in temperature,°C, not more thanof 0.1-0.4of 0.1-0.4 of 0.1-0.4of 0.1-0.4

Outlined shows that the invention conforms to the criterion “industrial applicability”.

JSC “Pervouralsk silica plant” manufactured and tested an experimental batch of silica refractories for lining glass, electric arc furnace, open-hearth furnaces, hot blast stoves for blast furnaces, coke oven batteries, which implemented the claimed solution.

Positive who passed the test results of silica refractories for the metallurgical enterprises have confirmed their effectiveness and wide possibilities of practical use in the future.

SOURCES of INFORMATION

1. CTL, Idesia, Psametik Technology of refractories, M.: “Metallurgizdat”, 1988, 308-342.

1. The composition of the mixture for the manufacture of silica refractories containing powders fractional crystalline quartzite humidity 1,6-2,5%, fine lamellar slates, lime-iron mixture, the rate of introduction of the silica mass of 0.2 to 3.0 Cao, 0,2-1,2 Fe2About3, and comprising in wt.% 3,0-12,6 slaked lime, 1,0-4,2 Converter sludge moisture content of 10%, to 0.6 in the dry residue of an aqueous solution of lignosulfonate density of 1.14-1.24 g/cm32 refractory clay with a moisture content of 12%, fire resistance of not less than 1670°With mass fractions of Al2About3not less than 30%, in the following ratio of the components of the charge in wt.%:

Fine plate slates To 0.4

The specified lime-iron mixture

fractions less than 0.009 mm in excess of 100% quartzite mixture of 1,4-4,8

Crystalline quartzite next

fractional composition of the Rest

Fractions of less than 0.5 mm 44-57%

Including particles less than 0.09 mm 24-36%

Fractions of 0.5-2.0 mm 12-55

Fractions 2-3,2 mm To 28

2. The composition according to claim 1, characterized in that the silica mixture for laying open hearth furnaces and heating units contains, wt.%, crystalline quartzite particles less than 0.5 mm - 45-49, including coat the AI less than 0.09 mm - 26-30, fractions of 0.5-2.0 mm - 33-55, fractions 2-3,2 mm - no more than 15, fine lamellar slates to 0.2, and further comprises a crystalline quartzite fraction more than 3.2 mm, not more than 3 wt.%.

3. The composition according to claim 1, characterized in that the silica mixture for laying coke ovens contains, wt.%, crystalline quartzite particles less than 0.5 mm - 44-57, including particles less than 0.09 mm - 26-36, fractions of 0.5-2.0 mm - 15-47, fractions 2-3,2 mm - 9-23, and further comprises a crystalline quartzite faction over 3.2 mm, not more than 5.

4. The composition according to claim 1, characterized in that the silica mixture for laying glass furnaces contains, wt.%, crystalline quartzite particles less than 0.5 mm - 46-50, including particles less than 0.09 mm - 26-30, fractions of 0.5-2.0 mm - 32-54, fractions 2-3,2 mm - no more than 15 refractory clay 0,8-1,2 on the dry matter, in excess of 100% silica mixture and further comprises a crystalline quartzite faction over 3.2 mm, not more than 3 wt.%.

5. The composition according to claim 1, characterized in that the silica mixture for laying electric arc furnaces contains, wt.%, crystalline quartzite particles less than 0.5 mm - 47-51, including particles less than 0.09 mm - 28-32, fractions of 0.5-2.0 mm - 35-53, fractions 2-3,2 mm - no more than 14, an aqueous solution of lignosulfonate density of 1.15-1.20 g/cm3- 0,2-0,4 on dry matter, in excess of 100% silica mixture, refractory clay 0,8-1,25 on dry matter, in excess of 100% silica mixture.

6. The composition according to claim 1,characterized in that that silica mixture for masonry stoves blast furnace contains, wt.%, crystalline quartzite particles less than 0.5 mm - 47-51, including particles less than 0.09 mm - 28-32, fractions of 0.5-2.0 mm - 34-53, fractions 2-3,2 mm - no more than 14, an aqueous solution of lignosulfonate density of 1.15-1.20 g/cm3- 0,2-0,4 on dry matter, in excess of 100% silica mixture), BOF sludge 1,2-2,1 on dry matter, in excess of 100% silica mixture.

7. A method of manufacturing silica refractories, comprising mixing the components of the mixture according to claim 1, forming the mass of the moisture content of 4.5 to 8.0% on the press at specific pressure 30-55 MPa number of beats no more than 3 to obtain the apparent density of the freshly-formed raw 2,22-2.4 g/cm, drying at a temperature of 50-220°C for 12-72 h, subsequent calcination at a temperature of 1200-1450°for 90-112 h exposure at 1375-1450°for 2-88 h and cooled during 46-132 PM

8. A method of manufacturing silica refractories according to claim 7, characterized in that the components of the mixture for the manufacture of open hearth furnace, coke oven, hot air, glass, electric, complex tubular or kaskadnykh product is dosed by weight, the powder of hydrated crystalline quartzite mix for 2-3 minutes, add in the mass of clay and BOF sludge and mixed for 3 min, the resulting mixture is injected lime-iron mixture, the wet weight is thew 3.8 to 6.3 percent stirred for 3-4 min, in the resulting mass is poured an aqueous solution of lignosulfonate density of 1.15-1.20 g/cm3and stirred for 3-4 min, the resulting mass humidity 4,5-8,0% molded articles in the press at specific pressure 30-55 MPA with the number of strokes or the clamps when pressing more than 3 to the apparent density of the freshly-formed raw 2,22-2.4 g/cm3, is dried at a temperature of 50-220°C for 12-72 h; shaped raw weighing more than 20 kg and particularly complex tubular or kaskadnye products pre-dried in natural conditions from 2 to 4 h, product weight up to 8 kg dried at a temperature of 140-180°C for 12 h, weighing from 8 to 20 kg at a temperature of 110-180°C for 16 h, weighing 20-40 kg and particularly complex tubular or kaskadnye product at a temperature of 60-90°C for 36 h, product special difficulty weighing over 40 kg and products being formed by a mechanical hammers, dried at a temperature of 60-90°72 h, the dried product is calcined at a temperature of 1200-1450°for 90-112 h exposure at 1375-1450°for 2-88 h, cooled silica product within 38-132 PM

9. The method according to claim 7, characterized in that the molded and dried products of normal size, the open-hearth furnace, coke oven, hot air, shaped with maximum weight, per garment, 16 kg heated and maintained at a temperature (45±30)°With 2-4 hours at (200±30)° - 6-12 h, (420±20)° With - 14-32 h, (1000±30)°S - 16-32 h, (1150±15)° - 6-12 h, (1190±15)° - 2-4 h, (1230±15)° - 2-4 h, (1260±15)° - 2-4 hours at (1320±15)° - 2-4 h, (1340±15)° - 2-4 h, (1360±15)° - 2-4 hours at 1380-1395° - 2-88 h, cooled to a temperature of 1000-1150°8-100 h, to 350-250° - 22-48 h, to 80-40°S - 16-32 hours

10. The method according to claim 7, characterized in that the shaped raw weighing more than 20 kg and particularly complex tubular or kaskadnye products pre-dried in natural conditions from 2 to 4 h, dried products weighing up to 8 kg at a temperature of 140-180°C for 12 h, the mass of 8-20 kg at 110-180°16 h, weighing 20-40 kg and particularly complex tubular or kaskadnye product - with 60-90°36 h, the products of special complexity, weighing over 40 kg and products being formed by a mechanical hammers - at 60-90°72 h; fittings and hot-blast products with a maximum weight of 16 kg is heated and maintained at a temperature (45±30)°With 2-4 hours at (180±20)° - 14-52 h, (380±20)°C - 8-24 hours at (580±20)° - 6-20 h, (1260±20)° - 10-24 hours at (1350±20)° - 2-4 hours at 1375-1450° - 2-56 h, cooled to a temperature (530±30)°20-92 h, to a temperature of (60±35)° - 10-20 hours

11. The method of manufacturing according to claim 7, characterized in that the molded product is cooled to a temperature of 40°46-112 h of the silica mass humidity of 5.0-6.0% molded products to the apparent density of the freshly-formed raw ,23-2,28 g/cm 3including for products of normal size - not less than of 2.27 g/cm3, arched open hearth - more 2.24 g/cm3, General purpose glass furnaces, electric arc furnaces - more of 2.26 g/cm3; hot-blast stoves for blast furnaces: the Packed product is more of 2.27 g/cm3wall and dome - more of 2.26 g/see

12. The method according to claim 7, characterized in that in the manufacture of coke oven products crystalline quartzite mixed with refractory clay 1.4 to 2.0 wt.% and Converter sludge of 0.45-0.7 wt.%, pour in an aqueous solution of lignosulfonate density of 1.15-1.20 g/cm30.2 wt.% on the dry matter, in excess of 100% Deposit charge, from the obtained mass humidity from 3.7 to 8.0% molded product.

13. The method according to claim 7, characterized in that in the manufacture of open hearth crystalline quartzite mixed with refractory clay 1.4 to 2.0 wt.% when the moisture content of the silica mass 5,0-8,0%, heavy products for masonry glass furnaces molded on a press equipped with a vibrator; before pressing difficult coke products on friction presses are powder lower front plate with a damp mass, sifted through a sieve with cell 0.2 mm; pressing raw complex and heavy products are produced on a base plate; a particularly complex products are formed by mechanical hammers: in the form fill up half in the cell, seal perimeter, add weight above the top of the form and RAM, add weight and continue plugging with repeat operations from one to three times, moisturize molded raw, sprinkle a thin layer of sand its top.



 

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The invention relates to refractory materials used in the metallurgical industry, in particular, as a refractory mixture for backfilling steel tapping channel steel-casting ladle

The invention relates to refractory industry, in particular the production of refractories for the lining of metallurgical vessels
The invention relates to refractory industry, in particular the production of refractories for the lining of metallurgical vessels

The invention relates to the production of ceramic materials

The invention relates to the production of refractory materials, in particular for lining metallurgical vessels, such as coke-oven batteries, heating wells, casting and hot-metal ladles

The invention relates to the production of building materials, in particular the construction of ceramic products, and can be used in the manufacture of brick wall

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The invention relates to the production of ceramic wall materials

The invention relates to the production of ceramic wall materials

The invention relates to the production of ceramic wall materials

FIELD: refractory industry, in particular dinas refractory for cladding of glass-melting furnace, arc-furnace, cold-charge furnace, coking plant etc.

SUBSTANCE: invention relates to batch composition and method for production of dinas refractory. Claimed batch contains (mass %) highly refined flaked slates ≤0.4; iron-lime mixture of grade ≤0.09 mm and graded crystal quartzite of grade ‹0.5 mm 44-57 in total, including grade ‹0.09 mm 24-36; grade of 0.5-2.0 mm 12-55; and grade of 2-3.2 mm ≤28. Method includes feeding of batch components, mixing, press forming of articles, drying at 50-2200C, annealing at 1200-14500C for 90-112 h, and holding at 1375-14500C for 2-88 h. Then dinas bodies are cooled for 46-132 h.

EFFECT: finished materials with improved refractory quality and reduced toxic burning products of adhesive.

13 cl

FIELD: ceramics.

SUBSTANCE: raw mix contains 50.69-51.4% of flue ash from brown coal combustion, 41.17-42.06% of microsilica from crystalline silicon production, and 6.54-7.84% of electrofilter dust from aluminum production.

EFFECT: increased frost resistance and reduced average density and firing temperature.

2 tbl

FIELD: ceramics.

SUBSTANCE: raw mix contains 52. 7-56.3% of microsilica, 42.5-46.5% of flue ash, and 0.8-1.2% of electrofilter dust from original aluminum production. Wall ceramic products comprises preparation of blend, molding, drying, and firing at 800°C, and additional steaming of fired products.

EFFECT: enabled involvement of man-made raw materials in manufacture of building materials, lowered firing temperature, increased strength and construction quality factor, and increased frost resistance of products.

2 cl, 2 tbl, 2 ex

FIELD: ceramics, building industry and materials.

SUBSTANCE: invention is designated for manufacturing wall ceramic articles. The raw mixture comprises the following components in the ratio, wt.-%: microsilica in manufacturing crystalline silicon, 33.9-54.5; ash fly after combustion of brown coals, 44.5-63.5, and electrofilter dust in basic manufacturing aluminum, 1.0-2.6. Electrofilter dust represents brown color waste and comprises calcium, magnesium and aluminum fluorides, cryolite and organic substances. Method involves preparing the charge, molding, drying, roasting at 800°C and moistening ready articles by keeping in water for 24 h. Invention provides enhancing resistance to cold, reducing average density and roasting temperature of material.

EFFECT: improved method for preparing, improved properties.

2 cl, 2 tbl, 2 ex

Composite material // 2257362

FIELD: aircraft industry; space industry; electrical industry; motor car industry; instrument-making industry.

SUBSTANCE: the invention is pertaining to the field of aircraft engineering, space engineering, electrical technology, motor car and instrumentation technologies, in particular, to composites produced on the base of glass dies reinforced by continuous carbon filling materials. The technical result of the invention ensures an increased heat-resistance of a composite material at operational temperatures above 800°C. The composite material includes (in mass %): a glass die - 60.5-73.5 and a high-modular carbon fibrous material - 26.5-39.5. The glass die contains ingredients in the following ratio (in mass %): SiO2 - 58.9-87.4, B2O3 - 2.7-15, SiOC - 4.5-11.5, TiSi2 - 4.5-11.5,SiB4 -0.9-3.7.

EFFECT: the invention ensures an increased heat-resistance of a composite material at operational temperatures above 800°C.

2 tbl

FIELD: aircraft industry; rocket industry; mechanical engineering and other industries; production of antenna blisters made out of quartz ceramics.

SUBSTANCE: the invention is pertaining to the aircraft and rocket equipment, in particular, to production of the antenna blisters for rockets and may find application in mechanical engineering and other branches of industry at production of items possessive a high strength in combination with radiotransparency in the whole range of temperatures of operation. The technical result of the invention is formation of a protective and hardening layer on the inner surface of the antenna blister, which possesses a sealing function, humidity resistance and a hardening effect. The method of production of the defensive and hardening layer in a shell of the antenna blister made out of quartz ceramics includes impregnation of then inner surface of the ceramic shell with an acetonic solution of a mixture of organosilicon and phenol-formaldehyde resins in the ratio of 1:2 accordingly, density of 0.940-0.980 g/cm3. The produced layer is dried at an indoor temperature within 3-6 hours, then polymerized at the temperature of 220-240°C within 4-6 hours. The impregnation conduct by a method of the communicating vessels in the closed volume or by the method of pouring over with water in the closed volume.

EFFECT: the invention ensures formation of a protective and hardening layer on the inner surface of the antenna blister, which possesses a sealing function, humidity resistance and a hardening effect.

3 cl, 6 ex

FIELD: refractory industry; production of large-size crucibles out of quartz ceramics.

SUBSTANCE: the invention is pertaining to the field of refractory industry, in particular, to production of large-size crucibles out of quartz ceramics. The invention offers the method of manufacture of the based on a quartz glass large-size square crucibles used in production of the "solar" silicon. On the basis of the quartz glass (SiO2 > 99.5 %) using its wet milling produce the highly-concentrated suspensions with density of 1.88-1.92 g/cm3, expose them to stabilizations, introduce a grainy filler (50-400 microns) in amount ensuring its contents in the molding system within the limits of 25-35 %. Molding of the crucibles castings is exercised in the porous molds. At that filling-up of the molds is conducted at their positions "the bottom up" and the molds disassembling and removal of the castings - at the position of the mold "bottom down". Hardening is achieved by sintering at the temperature of 1100-1200°C or by a hydrothermal treatment at the temperatures of 150-200°C with a soaking time of 4-12 hours. The technical result of the invention is obtaining a high density with uniform properties state of a material at the stage of molding with porosity below 13 %.

EFFECT: the invention ensures obtaining of a high density with uniform properties state of a material at the stage of molding with porosity below 13 %.

6 cl, 5 dwg, 4 ex

FIELD: quartz ceramic useful in production of big-volume and profile-compound articles by precision technology.

SUBSTANCE: claimed method includes job conditioning in ammonia 2-10 % aqueous solution or saturated calcium oxide water-ammonia solution with ammonia concentration of 2-10 % for 0.1-0.5 h followed by autoclave treatment under pressure of 5-25 atm for 2-20 h.

EFFECT: method for production of articles with improved physical and technical characteristics and increased heat resistance and resistance with regard to alumina or its alloy melts.

1 tbl

FIELD: construction industry; production of wall ceramic products.

SUBSTANCE: the invention is pertaining to the field of construction industry, in particular, to production raw materials mixture for production of wall ceramic products. The technical result of the invention is an increased frost resistance of the products at reduction of a shrinkage and temperatures of the material roasting. The raw materials mixture contains (in mass %): microsilica of production of crystalline silicon - 30.43-31.82, a fly ash from incineration of brown coals - 56.52-59.09 and a prorash from bucking of the spent carbon lining of electrolytic baths - 9.09-13.04.

EFFECT: the invention ensures an increase of frost resistance of the wall ceramic products at reduction of their shrinkage and the material roasting temperatures.

1 ex, 2 tbl

FIELD: production of ceramic articles.

SUBSTANCE: proposed method includes grinding the starting material by wet method for obtaining slip, stabilization of this slip, molding blanks from aqueous suspensions by slip casting method, thus forming porous gypsum molds; then heat treatment is performed; before heat treatment, surface of molded blank is treated with Cr2O3 at its concentration in water from 40 to 60 weight-%. Treatment of surface of molded blank with aqueous suspension of chromium oxide at concentration of from 40 to 60 weight-% increases blackness coefficient of blank, thus causing considerable activation of sintering process; number of technological operations and operating time are reduced considerably. Provision is made for use of rejects at molding stage.

EFFECT: enhanced efficiency.

1 tbl, 4 ex

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