SU1682347A1 - Raw mix for refractory concrete - Google Patents

Abstract

The invention relates to the production of building materials and can be used in the manufacture of linings for collectors of downstream gas pipelines of blast furnaces, blast furnace aggregates, collectors of agglomachines, steel splitting buckets, cooling rings, rotating furnaces of currents operating at temperatures up to 1600 ° C and above . The goal of the Invention relates to the production of building materials and can be used in the manufacture of linings for downstream gas pipeline collectors of blast furnaces, blast furnace aglobunks, sintering machine collectors, steel teeming ladles, cooling rings and the GOK rotating furnaces themselves, operating at a temperature of 1600 ° C and higher . Concreting is an increase in strength and heat resistance after firing at 150-1000 ° C. C and reduced water absorption. Raw mix for heat-resistant concrete contains, wt%: sodium liquid glass with a density of 1.42 g / cm 8-12.24, sodium silicofluoride 1.54-1.94, fine perlite 0.08-0.11, fine dispersed electrocorundum 17.5-19.44, finely dispersed tertiary slag of aluminothermic production 17.5-19.44, tertiary slag of aluminothermic production of a fraction of 0.14-10 mm 45.76-54.61, asbestos 0.75-0.99 and suspension 90% of the polycondensation product of polyethers of orthosilicic acid and 10% of bentonite activated with sulfuric acid — the rest. The mixture provides a density of 2760-2900 kg / m3, strength at the age of 3 days 23-27 MPa. 7 days 35- .37.7 MPa, after calcination at 100-1000 ° C 60-70 and 22-30 MPa, water absorption 1.3-1.46%, heat resistance (800 ° C water) 85- 90 heat cycles, acid resistance in sulfuric acid 67-106%. b The purpose of the invention is to increase the strength and heat resistance after about; gig at 150-1000 ° C and a reduction in water absorption. The following materials are used: sodium silicofluoride; sodium liquid glass with a silicate module of 2.6-3.0 and a density of 1.42-1.45 g / cm3; about 00 to 00 4 VI

Description

a suspension of 90% of polycondensation products of polyesters of orthosilicic acid and 10% of aluminosilicate — sulfuric acid-activated bentonite — light brown liquid with a silica content of 60%, alumina 1.2%, density 1.3 g / cm3;

Activated bentonite (Ascanite) (OST 113-12-86-82) - the powder of white or light gray color has a chemical composition, wt.%: SiO2 59.0-59.18, 25-25.9, Pe20z 1.8 -2.05, CaO 3.55-4.5, MDO 2.69-3.2, TiO2 0.6-1, MpO 1.1-1.5.

Grading. The residue on the sieve №02К no more than 5% Pass through the sieve №063 K not less than 75 Mass fraction of moisture, not more than 10% Mass fraction of free acidity in terms of sulfuric acid not more than 0.1%

pH of aqueous suspension not more than 3.5 Acetate sample not less than 0, 28 mg-eq / g. Bulk weight not more than 0.8 g / cm. Whitening ability at a flow rate of 1% ascanite from the weight of hydrated soybean oil with an initial color of 48-50 mg iodine less than 50%

Getting activated bentonite. Clay is fed to the clay cutting machines, and from there to the slurry preparation machines. Preparation of the suspension with water is carried out in a T: W ratio of 1: 3 for 6 hours.

The prepared suspension is pumped into the activator, where sulfur is then fed; 50% by weight of dry clay, the acid is introduced in small portions with stirring with compressed air using Erlift for an hour, then the suspension is heated with live steam to 95 ° C and boiled for 6-10 hours. Washing of sulfuric acid provide multiple dilutions with water suspension, past the activation operation. When this pH is 3.5, the residual acid content in the finished product is not more than 0.1%. The total time of the complete acid washing cycle is 48-50 hours. To speed up the suspension, 0.25% polyacrylamide solution is injected. After settling the acidic water, it is directed by gravity to the neutralization station, "where the neutralization is carried out with a solution of alkali. The washed suspension from the washing tank is transferred by pump into intermediate tanks, from which it is pumped to the drying and phase compartment, where the suspension is sprayed with pneumatic nozzles. The temperature in the furnace and the combustion zone is 900-1000 ° C. Dried in the tower

0

five

0

up to 10% of the wet clay is poured onto the conveyor and fed by an elevator to the crusher, then the powder with a size of not more than 5 mm is sent to the jet mill, and from there into the hopper where it is packed.

The product of polycondensation of polyethers of orthosilicon acid by fractional composition is a mixture containing,%: monoester 15.26-15.31, diester 36.64-36.92, triether 47.15-47.77.

The content of SI02 in these products is 60%. The polycondensation product of polyethers of orthosilicic acid is a triester or octaectoxytrisiloxane obtained in the synthesis and rectification of orthosilicic acid esters according to the following scheme:

SiCt C2H5OH

160-180 ° C

OS2N5

-C2H50-Si-OC2H5 OS2H5

monoester —HC1 220 ° C

0

five

0

five

triester

OS, H5 OCobU I. 5 I 2 5 diester - C2H50-Si-O - SbO-C2H5

OS2N5 OS2N5

НС1 ° СгН5 ОС2Н5

Above 250 ° С c2HsO Si-0-si-ooc2n5 ° CrH ° s n - $ | -osgn5 oc2Hs octaethoxytrisiloxane.

Fine perlite (powder) (GOST J 0832-74) - white powder fraction 0.05-0.1 mm.

Chemical composition,%: SO2 72.3-74.4, A1203 13.3-14.7, MDO 0.33-0.61. S02 0.19-0.34, Pe20z0.14-1.51, CaO 0.1-1, K20 + No. 20 4.7- 8.2, the loss on ignition is the rest.

Perlite powder is obtained by roasting crushed natural perlite in shaft furnaces, followed by swelling at temperatures of 850-1250 ° C. For the swelling interval, take the interval between the temperature at which the resulting perlite powder has a density of 0 80 kg / cm3, thermal conductivity 0.07 W (m .) at 850 ° С and vacuum Pa. specific surface 9-11 thousand cm2 / g.

Tertiary slaughter aluminothermic production - a waste from 3 productions of 5 ligatures of rare-earth metals.

The composition of the ligature of the 1st production (brand AMT), parts by weight:

Molybdenum anhydride

(TU 46-19-134-74) 600

Titanium sponge

(TG-120 GOST 17746-79) 60

Powder of aluminum (PA-4 GOST 6058-78) 280

(AKP TU 48-5-38-78) 280

Known to flux 160

Fluorspar30

Remains of ligatures (slags from the respective brands) 400

Calcium fluoride addition to the bottom 15 Composition of the production ll-ro ligature (AHMK brand), May, h ..:

Molybdenum concentrate (GOST 212-76) 420

Chrome oxide (GOST 2912-79) 246

Iron ore (TU 14-9-156-78) 60 Aluminum powder (PA-4 GOST 6058-78) 560

Known to flux

(OST 1464-80) 100

Fluorspar (GOST 7618-88) 50 Quartz sand (GOST 2255 K77) 30 Remains of ligatures (slags from the respective grades) 100

Calcium fluoride bedding

qi on the bottom 15

The composition of the ligature of the Ill production (brand AMBT), parts by weight:

Molybdenum concentrate

(GOST 212-76) 330

Vanadium thioxide

(TU 6-09-4093-78) 40

Chrome oxide

(GOST 2912-79) .220

Aluminum powder

(PA-4 GOST 6058-78) 280

(AKP TU 48-5-38-78) 280

Known to flux, (OST 1464-80) 100

Fluorspar (GOST 7618-83) 50 Quartz sand (GOST 22551-77) 64 Zirconium dioxide (GOST 21907-76) 30 Remains of master grades of the respective grades100 Calcium fluoride bedding on the hearth 15 Slag from three ligatures of rare-earth metals is called tertiary aluminum-thermal slag and has the following chemical composition, May .: ABOz 80-85, CaFa + CaO 4-5, Mo 0.5-0.7, SpUz 0.2-0.3. B, aO OD-1.7. Lr03 5-6, TU 0.3-0.5. NbO 2-2.5.

All the processes of these ligatures are ideal among themselves, since the melting of the mixtures is in the range of 1800-2000 ° C. You get a ligature and waste - slag with an aluminum oxide content of 80-85%.

Chrysotile asbestos (GOST 12871-78).

Mass dale balance,%. on the grid with size: 12.7 mm 19-21. 4.8 mm 22-24, 1.35 mm 25-27.

Mass fraction of dust and gali,%: dust 28-30, gali 31-32.

The degree of fuzz, MPa (mm Hg) 33-35

Average fiber length, mass fraction, mm39-41 Average density, g / l374 Chemical composition, wt.%: SlOa 40, MgO 40, CaO 0.5, AYEZ3, ReaOz 1.0. FeO 2.0, constitutional water 13.5.

Sludge electrocorundum (waste), chemical composition, wt.%: SlOa 1.2-3.0, MgO 0.4–0.5, C 0.4–0.6, A1203 83-89, TiO2 2.5- 4.0. ReaOz 1.2-1.6, CaO 0.8-1.6.

Samples are prepared as follows.

Finely ground tertiary slag of aluminothermic production, electrocorundum sludge, cream-sodium fluoride are loaded into the concrete mixer, the mixture is stirred for 3-5 minutes.

After mixing the fine fraction, perlite powder and asbestos are added and mixed for another 3-5 minutes. Then add crushed stone from the tertiary slag of aluminothermic production and mix it all up for 3-5 minutes. Liquid sodium glass is poured into the container. Separately mix the product of polycondensate polyethers of orthosilicic acid with aluminosilicate, which is a bentonite, activated with sulfuric acid and water to carry out the hydrolysis process. Density after mixing of liquid glass with a suspension from the product of the precondensation of polyesters of orthosilicic acid and activated bentonite should be 1.42 g / cm3 (per 300 g of liquid glass with a density of 1.45 g / cm3 - 20 l of water).

The half-silicate bond thus prepared is added to the concrete mixer and the whole mixture is mixed for 5-7 minutes.

The raw mix for the preparation of heat-resistant concrete can be applied by gunning or laid in the usual vibration manner.

Examples of compositions and their properties are given in Tables 1 and 2. Strength and heat resistance are determined on sample cubes 7x7x7 cm in size, water absorption is 5x5x5 cm, and acid resistance is 3x3x3 cm.

Claims (1)

Formula of the Invention A raw material mixture for heat-resistant concrete, comprising sodium liquid glass with a density of 1.42 g / cm3, sodium silicofluoride, a filler and a filler, and a suspension of 90% of the polycondensation product of polyethers of orthosilicic acid and 10% of sulfuric acid-activated bentonite, characterized in that , in order to increase strength and heat resistance after firing at 150-1000 ° C and reduce water absorption, it contains fine perlite, electrocorundum sludge and tertiary slag from aluminothermic production as a filler. , as a filler, tertiary slag of aluminothermic production of a fraction of 0.1-10 mm 0 and additionally asbestos in the following ratio of components, wt.%: Sodium liquid glass at 1.42 g / cm3 Sodium silicofluoride Fine perlite Fine grain sludge, electrocorundum Fine tertiary slaughter of aluminothermic production Tertiary slag of aluminothermic production of 0.14-10 mm 45.76-54, 61 Asbestos 0.75-0.99 The specified suspension Else. 8-12,24 1,5-1.94 0,08-4), 11 17.5-19,44 17,5-19.44 Tertiary slag of alumo-thermal production with a content of 80-85% Al20 from a fraction of 0.14-10 mm Fine tertiary slag of aluminothermic production with a content of 80-85% Fine sludge from electrocorundum Asbestos Fine Perlite (Powder) Sodium Silicon Sodium Liquid Glass Suspension: 90Ј polycondensation product of poly-, esters of orthosilicon acid and 10% bentonite activated with sulfuric acid Table 1 45.76 49.24 54.61 49.27 19.44 18.5 17.5 nineteen 0.07 0.06 0.07 Examples are given to justify the optimal ratio of components.