SU711005A1 - Raw mixture for producing light refractory filler - Google Patents

Description

The invention relates to building materials and is intended for the production of lightweight refractory aggregates used in concrete for lining thermal installations. Light heat-insulating refractory products containing 100 parts by weight are known. aluminum oxide and magnesium and 3-30 weight.h. phosphoric acid 1. The disadvantage of this thermal insulation material is large volumetric changes at high temperatures. The closest in technical essence and the achieved result to the proposed is refractory mass, including, wt.%: Electrocorundum 7-9, quartz sand 69-75 and aluminum chromophosphate bond 18-22 2. The disadvantage of this refractory mass is high bulk mass. The purpose of the invention is to reduce the bulk density, increase strength and decrease volumetric changes at a temperature of 1500-1900 ° C. The goal is achieved by the fact that a lightweight refractory aggregate, including an aluminum-chromophosphate binder and quartz sand, additionally contains refractory clay and iron oxide in the following ratio, wt.%: Aluminum-chromophosphate binder 29-40 Refractory clay12-15 Iron oxide I - 3 Quartz sandOther. In the process of thermal processing of the initial mixture, the iron oxide, interacting with the aluminum-chromophosphate binder, forms additional gaseous substances, which fluff up the plastic mass of the granules, reducing their bulk mass. In addition to this, the chemical reactions of the components of the mixture with the aluminum-chromophosphate binder result in the formation of phosphates of aluminum, crème, and chromium, which firmly bind the grains of quartz sand. In the process of roasting the aggregate, t1-clay clay additionally forms a ceramic bond, which leads to an increase in the strength of the material. rial Volumetric changes during the firing of the material is prevented by a ceramic layer of clay materials, which binds the grain of quartz sand. It is this combination of all these components that makes it possible to obtain a filler.

; reduced bulk density, increased mechanical strength and reduced shrinkage.

Example I. 29.0% by weight of an aluminum-chromophosphate binder is mixed with 55.0% by weight of quartz sand, 15.0% by weight of refractory glia and 1.0% by weight of iron oxide. After that, the mass is granulated and heat treated.

Example 2.40.0flec.% Of an aluminum-chromophosphate binder is mixed with 45.0% by weight of quartz sand, 12.0% by weight of refractory clay and

3.0% by weight of iron oxide. After that, the mass is granulated and heat treated.

Example 3. A 35.0 wt.% Aluminum chromium phosphate binder is mixed with 50.0 wt.% Silica sand, 13.0 wt.% Refractory clay and 2.0 wt.% Iron oxide. After that, the mass is granulated and heat treated.

The test results of a lightweight aggregate from the known and proposed raw mix are given in the table.

Bulk weight, g / cm

03

Compressive strength (kgf / cm) at 1500 ° C 35

Fire shrinkage,% at 1500 ° С

0.1

Thus, the proposed raw material mixture for obtaining a light refractory aggregate, having higher physical and mechanical characteristics in comparison with the known,. allows you to expand the scope of application of lightweight concrete, improve the thermophysical properties of lightweight concrete, reduce heat loss to the environment by 2 times.

Claims (2)

1. Japanese Patent N 49-2412 4, 20 (3) C-22, published. 1974. 2.Avtory certificate of the USSR, No. 220816, C 04 B 35/14, 1971.