SU1470692A1 - Composition for producing porous granules - Google Patents

Abstract

This invention relates to the composition of a mixture for the preparation of porous foam glass granules from aluminosilicate raw materials. In order to reduce thermal conductivity, increase strength and modulus of elasticity, the composition additionally contains cement dust in the following ratio of components, wt.%: Alkaline aluminosilicate wastes 71.1-96.45, sodium hydroxide 3-8, gasifier 0.05-0.9 cement dust 0.5-20.0. Porous granules are characterized by a grain density of 120-300 kg / cm ³ , a bulk density of 75-179 kg / m ³ , a thermal conductivity coefficient of 0.038-0.056 W / m _. K, compressive strength 0.15-0.91 MPa, water absorption per hour 0.07-6.0%, modulus of elasticity per tensile 4000-5000. 4 tab.

Description

one

BACKGROUND OF THE INVENTION The present invention relates to the composition of a mixture for the production of foam glass granules from aluminosilicate raw materials.

The aim of the invention is to reduce the coefficient of thermal conductivity, increased strength and modulus of elasticity of porous granules.

Porous granules are obtained in the following 1CIM manner. Waste hydrothermal processing of rocks is crushed in a runner mixer. Dust is introduced there — waste from cement production and water insoluble gas generators.

Sodium hydroxide is added to the prepared solid components and the mixture is stirred in the same slider mixer. Soluble gas formers are co-administered with. hydroxide solution

Carbon-containing vevs are used as gas formers, as well as carbonates, nitrates, etc.

The resulting mixture is granulated and swept at 730-900 ° C. Powder made from cement dust or other uncoupling agents is used to prevent the granules from sticking together.

Characteristics of the original components.

Cement drink. In the process of burning cement clinker in rotary kilns, a part of the calcined material is carried out of the kilns along with the flue gases in the form of dust. More carbonaceous komzhaeyu

ponent, to a lesser extent - clay and the blade component additive.

The proposed composition uses cement dust obtained at a cement-slate plant.

The chemical composition of cement dust is presented in table 1 ..

The specific surface is 3000–5000 sychg.

Alkaline aluminosilicate wastes are formed during the hydrothermal-alkaline treatment of aluminosilicate rocks in the preparation of alkaline silicates.

The chemical composition of alkaline aluminosilicate waste is presented in table 2.

Sodium hydroxide grade RD-1 is used; carbon black, technical nitric acid (grade III), and carbonate slurry are used as the structure of the additive.

The compositions of the mixtures for the preparation of porous granules, as well as the properties of the materials prepared, are presented in Tables 3 and 4.

Establishing the content of components above and below the specified limits does not lead to a decrease in the thermal conductivity of the foam glass granules and an increase in their strength and elastic modulus.

For example, an increase in the amount of a structure-forming additive of more than 9% by weight will lead to loosening and fragility of the granules, an increase in water absorption. The addition of less than 0.05 wt.% Even with a high consumption of sodium hydroxide (9.0 wt.%) Is not sufficient to reduce the density and thermal conductivity. An increase in the cement dust content of more than 20% by weight also increases the density and thermal conductivity, while a decrease of less than 0.5% reduces the elastic modulus.

Claims (1)

Invention Formula Composition to obtain porous. granules, including alkaline aluminosilicate waste, sodium hydroxide and a blowing agent, characterized in that, in order to reduce thermal conductivity, increase strength and modulus of elasticity, it additionally contains cement dust in the following ratio, wt.%: Alkali aluminosilicate wastes 71.1-96.45 Sodium hydroxide 3-8 Gasifier 0.05-0.9 Cement dust 0.5-20 Table 1 table 2 Table 3