SU1128528A1 - Refractory concrete mix - Google Patents

Abstract

REFRACTORY CONCRETE MIXTURE, including liquid glass, the main slag of the metallurgical industry with a basicity of at least 2 and quartzite is heavy and so that, in order to increase its strength at temperature, it additionally contains an oil refining product - sec-; Verin in the following ratio of components wt.%: l Liquid glass The main apak of metallurgical production with basicity of not less than 2 § Refined product - Severin O, Quartzite Else

Description

The invention relates to the building materials industry, in particular to refractory production and can be used in the manufacture of a monolithic lining of metallurgical ladles.

A refractory concrete mix is known, comprising wt.%: Liquid glass 12-18; ferro rum putty 2-3; fine silica-alumina additive 10-15; borax, quartz filler - the rest.

Also known refractory concrete mixture comprising wt.%: Crystalline quarch 95-99; basic self-dissolving shpak metallurgical production with a basicity not msh} its 2; liquid glass 16-18 (over 100%).

The last of the indicated mixtures is the closest to the essence described by the Schetches} and the achieved result.

A disadvantage of the known mixtures is tasselability.

 The purpose of the invention is to increase dura-1 nost t30C) C ..

The goal is achieved by using a refractory concrete mixture comprising basic glass of glass: a metal-and-metal manufacturing spat with a basicity of at least 2 and quartzite. The product additionally contains a product of oil distillation — Severin at the following ratio of components, wt. thin glass 14, 4-16) 6 The main shpak is metalurgic, which is produced from a base of at least 21.6–3.2 Oil product eperoHiOi northern, 4-0.7 Quartzite Extreme Severin is a product of distillation of oil at a predetermined interval of temperature similarly to other products of distillation, aprim, benzine, kerosene, etc., and is produced according to technical specifications, 863-81. The following composition of components, wt.% {Light catalytic 1 azoil 93 Mixture cracking - residues of distillate and residual flakes in a ratio of 0.6: 0.4 - 7. The mixture is solved to increase the durability of monolithic metallurgical ladle lining by increasing their high-temperature mechanical strength (and their strength and improving their production, as well as the task of producing high-quality linings in winter. This is due to the fact that severin, which is surface active, 1 is deposited on the zap) ln and thus reduces friction between them, prevents fine-dispersive particles from compacting the backstop, which ensures an even distribution of the aggregate in the concrete mass and, as a result, increases its workability.When the heat treatment of the lining as a result of Pyrolysis of Severin on the surface of mineral particles - components of the refractory mass, the formation of a carbon residue, which, upon further increase in temperature, undergoes graphitization due to high content of. North of non-condensed hydrocarbons. The liquid phase formed at temperature envelops the particles of graphite, preventing them from oxidizing at a temperature of over 1000 C. A graphite frame formed between the grains of the quartzite aggregate ensures a decrease in mechanical strength at high temperatures. In addition, the presence in the refractory mass makes it possible to produce high-quality linings in the winter. The time of providing this Severin additive is advisable to be introduced at PS 4ole of quartzite, since an equal distribution of the additive over the surface of the aggregate is achieved. Forming a film, from moisture to moisture, containing in the pores of the filler, increases the number of conditionally closed pores of the filler, preventing its freezing. Thus, the initial fractional composition of the aggregate is preserved and its equilibrium {distribution in the refractory mass, and hence the quality of the lining on its basis, is ensured. The presence of severin also increases the frost resistance of the castings. The quartz aggregate treated with severn (well retains its honor rash and is well transported at low temperatures. The introduction of severin when grinding quartzite reduces the thickness of the chromium, thereby improving the working conditions. The choice of severin content limits is explained as follows. Introduction Additives less than 0.4% do not provide an improvement in workplace properties due to insufficient wetting of the surface of the aggregate grains, and the introduction of more than 0.7% severin is ineffective, since this worsens sanitary and hygienic e conditions in industrial premises during heat treatment of a refractory lining. Example: Crystal quartzite, ferrochromic spar with CaO content of 35-50% (basicity 2) water solution of liquid glass with a density of 1.15 g / cm and the product of refining severin brand 2, produced by the industry according to TU 38.101.863-81, its composition is indicated above. The crystal quarter with the addition of severin is subjected to grinding in a ball mill. The grinding product contains 40-50% of particles with a particle size of 5-0.5 mm and 60-40% of particles with a particle size of less than 0.5 mm. Part II of quartzite with the addition of severin is tested for freezing at a temperature of - 20 ° C. Quartzite treated with severin does not freeze at this temperature on the hpot of the entire test period of 60 days, while quartzite without the addition of Severin died at –20 already at the beginning of the test;

Another part of the quartzite powder with Severin additive is used to make samples.

The grinding product is mixed. ferrochromic slag and shutter with a solution of liquid glass. Samples were made from the resulting fireproof concrete mass using the osht method.

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Samples are heat treated at temperatures and. For heat-treated samples, the compressive strength, open porosity, apparent strength and refractoriness are determined: The workability of the refractory watch is evaluated by the open porous surface.

These samples are heat-treated at the maximum temperature of the high-speed drying of the lining of the ladle. The composition and properties of the described mixture and the prototype are shown in the table. ;

The table shows that the proposed refractory mass has a higher mechanical strength with tempo and better workability, compared with the prototype mass,.

The indicated temperature corresponds to the service life of the intermediate zone of the monolithic lining of steel casting ladles, and the strength of this zone determines the durability of the monolithic lining in the chain.

The expected economic effect from the use of the described mixture in the manufacture of linings for steel-teeming ladles is formed by increasing the durability of the lining by 20-30%.

Claims (1)

FIRE-RESISTANT CONCRETE MIX, including liquid glass, the main slag of metallurgical production with a basicity of not less than 2 and quartzite, with the exception of the fact that, in order to increase strength at a temperature of 1300 ° C, it additionally contains a product oil distillation - severin in the following ratio ponents, wt.%: l Liquid glass Main chip 14.4-16.6 metallurgical - whom production with basicity <- not less than 2 1.6-3.2 in Oil product " distillation - northerners 0.4-0.7 | hl Quartzite Rest Ic S