SU1766856A1 - Composition for production of porous granules - Google Patents

Abstract

Use: production of building materials. The essence of the invention: the composition contains, wt%: volcanic rock 85.5-88.5; silicon carbide 2.5-3.3; soda ash 7.5-9.0; sodium fluoride 1.5-2.2. Properties of granules: compressive strength of 12.3-16.5 MPa, frost resistance of 35-40 cycles, table 2.

Description

The invention relates to the production of building materials for the production of a porous aggregate.

The known charge for obtaining granules of cellular glass, including, wt.% - 42-44% sodium hydroxide 10,23-22,74

1.53-9.53% nitric acid3.54-11.77

Volcanic vitreous rock Remaining 1J The disadvantage of this composition is low compressive strength, low frost resistance, and the use of aggressive components: sodium hydroxide and nitric acid.

Closest to the inventive composition for the preparation of porous granules is a composition for the preparation of a foam, comprising% by weight:

Gas generator0,3-1,2

Plaven2-9

Alkaline aluminosilicates or their mixture with rock - perlite, tuff or their mixtures Others 2

This foam composition has the following disadvantages:

low compressive strength and low frost resistance, as well as an unstable chemical composition using alkali aluminosilicates.

The aim of the invention is to increase the mechanical strength and frost resistance.

This goal is achieved by the fact that the composition for obtaining porous granules, including volcanic rock, alkaline component, flux and gas generator, contains the components in the following ratios, wt% Volcanic rock 85.5-88.5

Soda Ash7.5-9.0

Sodium fluorosilicate1.5-2.2

Silicon Carbide 2.5-3.3

The composition with the ratio of components provides porous granules with increased compressive strength and frost resistance.

Calcination of soda at low temperatures plays the role of a blowing agent. When heating # 2CO3, thermal dissociation occurs at a temperature of about 800 ° C. In this case, a gradual stepwise release of COA is achieved, which gives

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fine granular porosity of granules. At high yugatures, no. soCOz begins to decompose and plays a role smoothly, i.e. lowers the expansion temperature.

Silicon carbide is a high-temperature gas generating agent (790-880 ° C and higher) and during the sintering of the charge, the gasifier interacts with the charge, which affects the hardening of the structure of the granules.

Thus, the obtained granules with the content of NGSO3 and Si C have strong uniformly small pores, and this increases its mechanical strength and frost resistance.

In order to fully understand the essence of the invention, Table 1 lists control examples for substantiating the limits of the composition and specific examples for the manufacture of the proposed composition of the porous granulate.

Porous pellet technology.

Crushed raw materials: volcanic mountain rock (tuff, perlite and lithoid pumice), soda ash (IGCO3 GOST 1302-76), sodium silicofluoride (NaiSiFe GOST 87-77) and silicon carbide (SiС TU 2-036-804-79) the calculated quantities are stirred until a homogeneous mass is obtained, granulated and expanded at 850-930 ° C for 10-15 minutes.

The basic object for comparison with the proposed composition is gravel and expanded clay sand GOST 9759-83.

The advantage of the proposed composition for obtaining porous granules in comparison with the known, basic and control examples are given in Table 2.

As can be seen from Table 2, the proposed composition for the preparation of porous granules according to

compared with the known has several advantages:

low expansion temperature;

increased compressive strength; increased frost resistance.

Prototype composition porous

pellet made and tested in the laboratory

Yerevan branch VNIIzhelezobeton and

at Lianozovo Plant Keramzitbeton,

Moscow

The test results are satisfactory and are given in the attached test report.

The introduction is planned at the plants of G, G. Arktika and Leninakan in 1991 in the amount of 500 thousand m3 / year.

The total demand in the republic is 1000 thousand m3 / year.

The annual economic effect from the introduction will be approximately 400 thousand rubles / year compared to the base object Gravel and expanded clay sand, and taking into account the demand of 800 thousand rubles.

Claims (1)

Invention Formula A composition for producing porous granules, including volcanic rock, a blowing agent, an alkaline component, and sodium silicofluoride, characterized in that, in order to increase the mechanical strength and frost resistance, it contains silicon carbide as a blowing agent, and soda ash as an alkaline component , in the following ratio, wt.%: volcanic hearth breed 85,5-88,5; silicon carbide 2.5-3.3; soda ash7.5-9.0; sodium silicofluoride 1,5-2,2. 45 Table 1 Indicators of the properties of granules obtained on the basis of tuff, with a bulk bulk density of 350 kg / m3 Temperature of swelling, С Strength 1,5-10,3 1-1,5 under compression, MPa Frost resistance, 5 cycle 870-990 1150-1180 330 15 15-20 kS 920 910 16.5 15.8 50 A8 Did not blister. -IU Indicators of the properties of granules obtained on the basis of perlite and pumice, with a bulk density of 250 kg / m3 Expansion temperature - 870-990 1150-1180 880-890 870-880 850-860 Non-explosive, Acce. were leaked Strength at 1.5-10.3 0.6-0.8 11.5 13.0 12.3 compression, MPa Frost resistance, 5-8 cycle 15-25 Continuation of table 1 910 15.8 A8 I didn’t get up- were leaked -IU „“ .. 35 BO 37