UA78423C2 - Refractory concrete mixture - Google Patents

Abstract

A fireproof concrete mixture for manufacturing monolithic lining of high thermal and slag resistance thermal aggregate elements such as walls and the bottom of steel-pouring and intermediate ladles containing wt. %: 44-57% of corundum filler, 23-27% of fine-grained aluminum-magnesium spinel fractions including particles of 1.9 mkm, not less 50%, 4-6 of high-alumina cement, 12.07-14.73 of fine-grained alumina including the particles less than 10 mkm, not less than 50 %, 0.8-1.2 of a dispersible additive, 0.07-0.13 of organic fibre.

Description

Description of the invention

The invention relates to the refractory industry and can be used for the production of 2 refractory concrete intended for the manufacture of monolithic linings of elements of thermal units, for example, walls and bottoms of steel casting and intermediate ladles, etc.

A known corundum hydraulically hardening mass containing corundum aggregate and high-alumina cement IN.N. Sokolov, R.M. Shumeiko, P.D. Orekhov "Hydraulically hardening corundum mass for steel vacuum installations", Ogneupor, 1984, Mo1, p.5-7|. 70 The disadvantage of the indicated corundum hydraulically hardening mass is low high-temperature strength, heat resistance and slag resistance.

The closest to the invention in terms of technical essence and the achieved result is the refractory concrete mixture, which. contains, wt. 9o: corundum aggregate (76), high-alumina cement (5), finely dispersed alumina with content, particles, size, less than 1 Ohm, not less than 5095 (18) and a dispersing additive (1) | (patent of Ukraine 79 Mo71042, 7 СО4835/66, 35/10, 28/06, 15.11.2004, Bull. Mo11, 2004|.

However, this refractory concrete mixture is characterized by insufficiently high strength (143.5MPa), reduced thermal resistance (10 heat changes of 13002 - water) and slag resistance (area of corrosion by slag - 27mm2).

The invention is based on the task of creating a refractory concrete mixture, in which the additional introduction of fine-grained aluminomagnesian spinel of a fraction smaller than 0.5 mm, with a predominant particle size of 0.5-0.09 mm, aluminomagnesian spinel with a content of particles with a size of 0.µm, not less than 5095 and organic fiber provides an increase in the strength, heat resistance and slag resistance of concrete, which in turn increases the stability of linings of thermal units.

The task is solved by the fact that: a refractory concrete mixture containing corundum aggregate, high-alumina cement, grade 29 finely dispersed alumina with a content of particles, the size of which is less than 7μm, not less than 5095 and dispersing (3 additive, according to the invention, additionally contains fine-grained aluminum magnesium spinel fraction smaller than

O.5mm, with a predominant particle size of 0.5-0.09mm, aluminum-magnesium spinel with a particle content of 1.9μm not less than 5095 and organic fiber, with the following ratio of components, wt. 9o: so corundum filler 44.0- 57.0 Ge! fine-grained aluminomagnesian spinel of a fraction smaller than O.5mm, with a predominant particle size of 0.5-0О0.09mm 23.0-27.0 aluminomagnesian spinel with a content of particles with a size of 1.9μm not less than 5095 3.0-7.0 in high-alumina cement 4.0-6.0 (ee) finely dispersed alumina with a content of particles, the size of which is less than 1 Ohm, not less than 50950 12.07-14.73 3o dispersing additive 0.8-1.2 in organic fiber 0.07 -0.13

A distinctive feature of the invention is that the use of fine-grained aluminomagnesian spinel of a fraction smaller than O0.5 mm, with a predominant particle size of 0.5-0.09 mm, contributes to increasing slag resistance due to the interaction of AIgOz spinel with slag components, which makes it more tongue and less mobile. no) c The introduction of aluminum-magnesium spinel into the composition of refractory concrete with a content of particles with a size of 1.9 μm not less than 5095, which is evenly distributed in the volume of concrete, contributes to the compaction of its structure, which also increases the resistance of concrete to the penetration of slag and increases its strength due to more intensive sintering, which is caused by the presence of finely dispersed spinel particles.

In addition, the use of aluminum-magnesium spinel in the concrete mixture, which is characterized by low coefficient of thermal expansion, provides an increase in the thermal stability of concrete.

Го) The presence of organic fiber in its composition also contributes to the increase in the thermal resistance of concrete, which, when burned, creates channels that prevent the propagation of cracks during thermal cycling. o The invention is illustrated by the examples given in the table. ko 20 In the laboratory of OJSC "UkrNDIV named after A.S. Berezhny" a refractory concrete mixture was produced according to the invention and a prototype according to a typical manufacturing technology. c» Samples were made from the refractory concrete mixture - cubes with a rib side of 40 mm by vibrocasting in collapsible molds.

The compressive strength of the samples was determined according to GOST 4071.1-94 after heat treatment at 160090 with a holding time of 5 g.

GF) Heat resistance - according to GOST 7875.1-94 according to mode 130022 - water on pre-fired at 100092 (b5g) t samples.

Slag resistance was evaluated by the crucible method at 16002 with a 2-hour exposure. on pre-fired at 10002 (5 g) samples with a cylindrical recess with a diameter of 15 mm and a depth of 18 mm. Chemical composition of slag from a steel pouring ladle, mass. 90: 5iO" - 18.4; AI2O»z - 22.0; Be2O»z - 9.41; CaO - 39.4; MoO - 8.07; MPO - 0.96; MaO - 1.33; KO - 0.16.

As can be seen from the table, the refractory concrete mixture of the proposed composition, in comparison with the prototype, is characterized by a higher compressive strength after heat treatment at 1600 °C (162 MPa and v5 143.5 MPa, respectively), 1.5 times higher thermal resistance (22 heat changes and 10 heat changes 13009 - water, respectively) and increased slag resistance by 3.5 times (corrosion by slag - bmm and 27mm, respectively). -D-

The composition of refractory concrete mixtures and their properties

Mo1 Mo2 Mo Mo4 Mo Mob prototype (optimal proposed proposed |foreign foreign

Nomenclature of minerals 11111111 - Fine-grained aluminomagnesian spinel 25.0 27.0 23.0 27.5 22.5 of a fraction smaller than О.5 mm, with a predominant particle size of 0.5-0О0.09 mm - Aluminomagnesian spinel with a particle content of 5.0 7.0 30 7.3 21 1.9 μm not less than 5095

Upland cement 11111101 50000501 50140 15337 - Finely dispersed alumina with a content of 18.0 13.4 14.73 12.07 15.23 11.57 particles/size, smaller than 1Ωm, x595

Orniaevyayu 11111111111111103001000и000100070010 03100505

Honors of the authorities 11111111 17711111 1. Compressive strength after heat treatment 143.5 162 155 153 147 145 at a temperature of 16002 (5g), MPa 3. Slag resistance (slag corrosion), mm? 161181

The proposed invention is planned for implementation at the Experimental Production of OJSC "UkrNDIV named after A.S.

Berezhny" in 2005-2006.

Claims (1)

The formula of the invention of 30 . M M Refractory concrete mixture CONTAINING corundum aggregate, high-alumina cement, finely dispersed alumina with a content of particles, the size of which is less than 10 μm, not less than 50 95, and a dispersing additive, which is characterized by the fact that it additionally contains fine-grained aluminum-magnesium spinel Fractions , less than 0.5 mm, with a predominant particle size of 0.5-0.09 mm, aluminum magnesium spinel with a content of particles, (2.0) 1.9 μm in size, not less than 50 9b, and organic fiber, with such ratios of components, mass 9o: it is a corundum aggregate 4-5 fine-grained aluminomagnesian spinel of a fraction smaller than 0.5 mm, with a predominant particle size of 0.5-0.09 mm 23-27 aluminomagnesian spinel with a content of particles with a size of 1.9 microns, not less from 50 95 3-7 « high-alumina cement 4-6 - with finely dispersed alumina with a content of particles, the size of which is less than 10 μm, not less than 50 95 12.07-14.73 dispersing additive 0.8-1.2 . i t organic fiber 0.07-0.13. miya ch sdtrt ch I I - - Official bulletin "Industrial Property". Book 1 "Inventions, useful models, topographies of integrated microcircuits", 2007, MZ, 15.03.2007. State Department of Intellectual Property of the Ministry of Education and Science of Ukraine. d» ime) be» ime) bo b5