SU1357385A1 - Refractory compound - Google Patents

Abstract

The invention relates to compositions of refractory masses, mainly used for pressing fireproof plates in the preparation of slide gates for steel casting. The purpose of the invention is to reduce energy consumption by eliminating drying and increasing the strength of the mass. The mass contains, wt%: magnesite powder fraction 0-0.5 mm 75-85; methylcellulose 0.1-0.3; gypsum 14.7-24.9. The mass is characterized by mechanical strength of 0.29-0.32 MPa, gas permeability of 0.051-0.038 m-l / m-h-mm of water of station. and apparent density of 2.20-2, 24 g / cm. 1 tab. With 9 (L its JV 1 00 CX) ate

Description

The invention relates to compositions of refractory masses used to press-in refractory plates in the preparation of slide gates for casting steel.

The purpose of the invention is to reduce the energy consumption by eliminating the drying process and increasing strength.

The mass is prepared by mixing magnesite powder, gypsum and methylcellulose and sealed with water to a moisture content of 8–10%.

Entering gypsum provides strength ramming mass. The rapid hardening of gypsum necessitates the use of scavenger retarders, which reduce the rate of dissolution of the gypsum. The hydration and crystallization of gypsum is completed in 20-40 minutes after mixing. By this time, the maximum wet mass strength is also reached. As it dries, the strength of the hardened mass begins, which is no longer due to further hydration processes but by evaporation of water, which, when removed, eliminates the mutual slip of the crystals, which leads to a decrease in the strength of the hardened mass.

The introduction of methylcellulose as a retarder

Components mass, wt,%

75 80 85

thirty

24.9 0.1 19.8 0.2 1.7 0.3

0.1

60

Compiled by A. Kalabukhova. Editor N. Bobkova. Techred M. Morgan Corrector A. Zimokosov

Order 5940/21 Circulation 588 Subscription

VNIIPI USSR State Committee

for inventions and discoveries 113035, Moscow, Zh-35, Raushsk nab., 4/5

Production and printing company, Uzhgorod, Projecto st., 4

binder, emulsifying, dispersing, softening and adhesive action.

Specific examples of the refractory mass and properties of products made from it are listed in the table.

These tables confirm the improvement of the properties of the refractory mass in comparison with the known: seemingly

gas supply

density of 2.20-2.24 g / cm impermeability of 0.051-0.038 m-l / m-h mm water line, the limit of mechanical strength of 0.29-0.32 MPa.

Claims (1)

Invention Formula The refractory mass is predominantly used to press-in the refractory plates in the preparation of gate valves for steel casting, containing magnesite powder of a 0-0.5 mm fraction and methylcellulose, characterized in that it additionally contains gypsum in the following ratio, wt.%: Magnesite Powder fractions 0-0,5 mm 75-85 Methyl cellulose 0.1-0.3 Gypsum14.7-24.9 Product properties ,9 2.2 2.22 2.23 3.2 0, OA9 0.045 0.041 0.062 0,295 0,3l o 0.312 0,260 9 10 15