SU914534A1 - Raw meal for making silica brick - Google Patents

Description

The invention relates to the construction materials industry and can be used in the manufacture of autoclaved silicate products.

A raw mix is known for the manufacture of silicate bricks, including ground electrothermophosphoric slag, lime, gypsum and sand [1].

Closest to the invention to the technical essence and the achieved result is the raw mix for the manufacture of silicate bricks, including, wt.%: Ground electrothermophosphoric slag 22-25, calcined at 700-800 ° C; dolomite 6-10; sand 55 "b9 and plastic clay 6-10 [2].

The disadvantages of the known raw materials are low strength, insufficient frost resistance and high water absorption.

The purpose of the invention is to increase the strength and frost resistance and reduce water supply.

This goal is achieved by the fact that the raw mix for the manufacture of silicate bricks, including ground electrothermophosphoric schlak, lime, sand and clay, additionally contains sodium chloride, sodium sulfate and magnesium sulfate in the following ratio of components, wt.%:

Ground electrothermophosphoric slag 22-30

Lime 2-5

Clay 5 “Yu

Sodium chloride 0.05 * 0.5

Sodium sulfate 0.13 * 0.9

Magnesium sulfate 0.02-0.1

Sand Rest

As raw materials

use granulated phosphoric slag of the Chimkent plant of phosphate salts, clay from the Chingeldinsky deposit in the Apma-Ata region, lime from the Sas-Tyube plant, sand from the Nikolayevsky deposit, chloride

3 91

sodium, sodium sulfate and magnesium sulfate (or natural analogues containing these salts)

The chemical composition of raw materials is presented in table. one.

Example. When producing silicate brick, phosphoric slag is crushed together with lime to a specific surface of 2800-3500 cm ^ / g.

.The mixture of phosphoric slag, co-milled with lime, clay and sand is thoroughly mixed, and then moistened with an aqueous solution of salts to a molding moisture of 6-7%.

four

Silicate brick of a standard size is molded on a press at a specific pressure of 200 kg / cm ^, then autoclaved under excessive pressure

5 4-6 kg / cm ^ - according to the mode 1, 5 + 4 + 1, 5 h.

The content of components (wt.%) In the known and proposed formulations are presented in table. 2

The test results obtained 10 products are given in table. 3

It follows from the above data that, in comparison with the known, the strength of the products from the proposed mixture has increased, the frost resistance has increased, water absorption has decreased.

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with; . one <0 X one but (0 X sh 1 X X about n 1 pz X υ <0 1 s; with; <and X 13 and with.

Lime 1-1.4 0.4-0.6 0.1-0.3 91 * 95 3.2-5.2 0.29-0.33 - 0.83-1.95

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table 2

-----------------: Content, wt.%, in composition Components The proposed III | Known

Slag 22 25 thirty 22-25 Lime five 2 3 - Annealed at 700 ° Dolomite - - - 8-10 Sodium chloride 0.05 0.2 0.5 - Sodium sulfate 0.13 0.5 0.9 - Magnesium sulfate 0.02 0.05 0.1 - Clay five eight ten 8-10 Sand 67.8 64.25 55.5 62-55

Table 3

The compositions Raw strength, kgf / cm ¹ ^ Strength at compression, kgf / cm ^ Water absorption,% after autoclave treatment after 50 freezing cycles and thawing Proposed I 3.0 350 315 9.2 AND 3.7 362 332 8,8 t 4.0 352 318 9.4 Known [2] 225-204 After 25 13.5-12.7 Known [r one 132 cycles 185-176 89 16-17

Claims (1)

Claim Raw mix for the manufacture of silicate bricks, including ground electrothermophosphoric slag, lime, sand and clay, characterized in that, in order to increase strength and frost resistance and reduce water absorption, it additionally contains sodium chloride, sodium sulfate and magnesium sulfate in the following ratio of components, wt.%: Ground electrothermophosphoric slag 22-30 Lime 2-5 Clay 9 914534 Sodium chloride 0.05-0.5 Sodium sulfate 0.13-0.9 Magnesium sulfate 0.02-0.1 Sand Rest