RU1791421C - Raw mixture - Google Patents

Abstract

Usage: large-sized ceramic brick. SUMMARY OF THE INVENTION: the mixture contains slag of electrothermophosphorus production of 15-20%, woody loam of 50-6%, plastic clay of 15-26% and cullet 5-10%. The components of the mixture are mixed, preforms are molded, dried and fired at 950-1000 ° C. Characteristics: tensile strength in bending 22.5-26.2 MPa, compression 44.5-52.2 MPa, water absorption 12.8-13.6%, frost resistance 110-120 cycles. 2 tab.

Description

The invention relates to the production of building materials and can be used in the preparation of building bricks.

Known ceramic mass for the manufacture of bricks, including loesslike rock 50-75, clay 15-30, slag electrothermophosphorus production 10-20,

A disadvantage of this mass is the low strength of 94-140 kgf / cm2.

Closest to the technical nature of the invention is a mixture for the manufacture of building products, including slag electrothermophosphorus production 25-30, loesslike loam 20-30, plastic clay 20-30 and ash 15-25.

A disadvantage of the known composition is the rather low strength indicators of 16.8-41.1 MPa.

The aim of the invention is to increase strength and reduce water absorption.

This goal is achieved in that the raw mixture, mainly for the manufacture of bricks, including slag electrothermophosphorus production, loesslike loam and plastic clay;

additionally contains cullet in the following ratios of kbmponents, wt.%:, Slag of electrothermophosphorus production 15-20 Loesslike loam 50-60 Plastic clay 15-25; Cullet 5-10 The raw material mixture is prepared as follows. ;

The slag and cullet are ground wet in ball mills until they pass through, a day through a sieve of 900 holes / cm with a residue on the first sieve of not more than 2%. Loesslike loam and; clay is mixed in a double-letter mixer, slag suspension and cullet with a humidity of about 50% and a mixture are added thereto; moisten with tap water to a moisture content of 20-22%. The resulting plastic mixture is evacuated on a tape press chamber, the exit tape is cut into bricks of 270 x 270 x 70 mm or 250 x 250 x 60 mm. Drying is carried out in drying chambers at 100-110 ° C, and is fired in a chamber gas furnace at 950-1000 ° C.

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A colorless or greenish cullet is used in the raw mix, a softening temperature is 950 ° С, of the following chemical composition, May,%: SI02 70.8; 2.93; ReaOz 0.1; CaO 7.8; MdO 2.05; MazO 15.2; “200.55; 50зО, 57, in relation to the influence of aggressive environments Corresponds to the III hydrolytic class.

Introduction to a known mass of cullet promotes the formation of a liquid phase at 850-900 ° C. The reaction of loess particles with clay at a temperature of 6 b $ kyga 950-1000 ° C takes place in the presence of a liquid phase, the latter is evenly distributed between the refractory particles of clay minerals and reinforces the total mass ..

Specific examples of the proposed raw mix are given in table. 1.

The resulting large-sized brick has the following physical and mechanical properties, are given in table. 2.

Formulas of the invention

The raw material mixture, mainly for the manufacture of bricks, including slag of electrothermophosphorus production, loesslike loam and plastic clay, is notable for the fact that, with the aim of improving durability and reducing water absorption, it contains additional cullet in the following ratio of components, wt.%. : Slag electrothermophosphorus production 15-20 Loesslike loam 50-60 Clay plastic 15-25 Cullet 5-10

,. .... ... Table 1

table 2