Light fire resisting brick of iolite-mulbite and preparation process thereby

Abstract

The invention is a iolite-mullite light fireproof brick and its preparing method, and its characteristic: using coal gangue 40.0-79.8 Wt.%, magnesia 10.0-30.0Wt.%, and iron-removed bauxite 10.0-30.0 Wt.% as main raw materials, adding in sawdust 0.02-0.2 Wt.%; adding water in water-solid ratio=0.5-0.6 in a ball mill for mixing and milling, and milling up to the screening allowance of a 44 mum-pore size sieve less than 2.0Wt.%; then throwing in a mud press to form mud cake, uniformly mixing the mud cake with organic substances: sawdust, etc, and then making extrudsion forming by a mud extruder, or manually beating or making pour forming. The crude blank is dried and then burned at 1200-14400 deg.C, and then made into iolite and mullite by solid- and liquid- phase reaction. The brick blank is cut and milled to obtain the light fireproof brick with cordierite and mullite as main crystal phase. It uses solid wastes of coal gangue and can save energy sources in burning course by using combustibles in the coal gangue, and at the same time, it is easy maintain a reducing atmosphere in the brick blank, beneficial to optimizing the product properties.

Description

technical field [0001] The invention belongs to the field of refractory materials, in particular to a cordierite-mullite lightweight refractory brick. Background technique [0002] Cordierite is the mineral with the lowest coefficient of thermal expansion among all known silicate minerals, so products with cordierite as the main crystal phase have good resistance to rapid cooling and rapid heating. Lightweight refractory bricks are mostly used for the refractory lining of intermittent kilns. The service life of these lightweight refractory bricks is mainly affected by the material's resistance to rapid cooling and rapid heating. Therefore, cordierite-mullite lightweight refractory bricks with a low thermal expansion coefficient are used in intermittent kilns with frequent heating and cooling, which will make the furnace lining have a long service life. At the same time, the presence of mullite and a small amount of spinel makes this This kind of lightweight refractory brick...

AI Technical Summary

Problems solved by technology

[0004] The patent "Production Method of Cordierite Lightweight Aggregate Brick" (Application No.: 95110523 X; Publication No.: CN1121493A) introduced talcum powder, bauxite, burnt gemstone, clay and alumina powder as main raw materials through foaming , molding, drying to prepare lightweight aggregate, and then use talcum powder, red clay, black clay, alumina powder, etc. The preparation method of cordierite lightweight refractory bricks, but there is no mention of using coal gangue (or coal-series kaolinite) as the main raw material and forming, drying, and calcining to make cordierite-mullite lightweight refractory bricks. craft