RU2351569C2 - Charge for preparation of lightweight fire resistant material - Google Patents

Abstract

FIELD: fire-protection facility.

SUBSTANCE: invention is related to production of lightweight fire-resistant materials used in construction. Charge for preparation of lightweight fire-resistant material contains clay, pitch coke, polystyrene, borax, chamotte, lime and wastes of sulfuric acid production, at the following ratio of components, wt %: clay - 12.0-14.0; pitch coke - 15.0-19.0; polystyrene - 3.0-4.0; borax - 4.0-5.0; lime - 3.0-4.0; wastes of sulfuric acid production - 3.0-4.0; chamotte - the rest.

EFFECT: increased strength of lightweight fire-resistant material.

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Description

The invention relates to the production of lightweight refractory materials used in construction.

Known mixture for the manufacture of lightweight refractory material, containing, wt.%: Clay 15.0-24.0; pitch coke 20.0-40.0; polystyrene 3.0-5.0; borax 3.0-5.0; chamotte - the rest [1].

The objective of the invention is to increase the strength of lightweight refractory material.

The technical result is achieved by the fact that the mixture for the manufacture of lightweight refractory material containing clay, pitch coke, polystyrene, borax, chamotte, additionally includes lime and sulfuric acid production waste, in the following ratio of components, wt.%: Clay 12.0-20, 0; pitch coke 15.0-19.0; polystyrene 3.0-4.0; borax 4.0-5.0; lime 3.0-4.0; Wastes from the production of sulfuric acid 3.0-4.0; chamotte - the rest.

The composition of the mixture for the manufacture of lightweight refractory material using clays of the following composition, wt.%:

SiO ₂ 42.0-80.0; Al ₂ O ₃ 13.0-35.0; TiO ₂ 0.3-1.6; Fe ₂ O ₃ 1.2-11.0; CaO up to 1.7; MgO 0.2-1.6;

Na ₂ O 0.1-3.6; K ₂ O 0.1-4.4; p.p.p. 2, 6-15, 7.

Wastes from the production of sulfuric acid generated in the process of neutralizing sulfuric acid wash water with lime, after filtration, have the composition, wt.%: Hydroxides and iron oxides (in terms of Fe ₂ O ₃ ) 5.0-15.0; CaSO ₄ · 2H ₂ O 25.0-33.0; CaCO ₃ + MgO + SiO ₂ 1.0-5.0; H ₂ O 40-60.

The table shows the composition of the charge for the manufacture of lightweight refractory material.

Components Composition, wt.%: one 2 Clay 14.0 12.0 Pitch coke 15.0 19.0 Polystyrene 4.0 3.0 Borax 5,0 4.0 Lime 4.0 3.0 Sulfuric Acid Wastes 4.0 3.0 Fireclay rest rest Strength of the material (granules 20-40 mm), MPa ~ 7.5 ~ 7.5

The components are prepared and dosed. Wastes from the production of sulfuric acid are mixed with lime, polystyrene polystyrene is crushed to a powder state (for example, in the form of scraps). Powdered borax, clay, pitch coke, chamotte are added to the resulting mass and a mixture is prepared with a moisture content of 18-23%. Granules are formed from the plastic obtained, for example, with a size of 20-40 mm, which are dried to a moisture content of 2-4% and fired at a temperature of 1100-1200 ° C. When fired, expanded polystyrene and pitch coke burn out, forming pores. The result is a durable lightweight refractory material that can be used as backfill for thermal insulation of industrial furnaces and thermal units. The material is intended for operation at temperatures up to 900 ° C.

The source of information

1. SU 1162769, C04B 33/22, 33/06, 1985.

Claims (1)

A mixture for the manufacture of lightweight refractory material containing clay, pitch coke, polystyrene, borax, chamotte, characterized in that it further contains lime and sulfuric acid production waste in the following ratio of components, wt.%: Clay 12.0-14.0; pitch coke 15.0-19.0; polystyrene 3.0-4.0; borax 4.0-5.0; lime 3.0-4.0; Wastes from the production of sulfuric acid 3.0-4.0; fireclay the rest.