Compact silica refractory material and preparation method thereof

Abstract

The invention relates to a compact silica refractory material and a preparation method thereof, and belongs to the field of refractory materials. The refractory material comprises the following raw materials in percentage by weight: 62.5 to 58.3 percent of crystal silica particles with the grain diameter of 1.40 to 2.26 mm, 37.5 to 41.7 percent of crystal silica particles with the grain diameter of 0.59 to 0.088 mm, 34 to 46 percent of mixed fine powder with the grain diameter less than or equal to 0.088 mm, 3 to 4 percent of mineralizing agent, and 3 to 10 percent of additive. The preparation method comprises the following steps: performing dry mixing on the raw materials for one minute, adding concentrated pulp waste liquor into the mixture to be mixed for 8 minutes, and ageing the mixture for 4 hours, wherein the molding pressure of a blank is more than or equal to 100 MPa; and drying the blank for 10 hours at the temperature of 60 to 100 DEG C, performing hard fire on the blank at the temperature of 1,400 to 1,430 DEG C, and keeping the temperature for 6 to 8 hours. The compactness and the tridymite content of the silica refractory material are higher than those of a control sample, and the invention can provide a novel silica refractory material for metallurgical coke and the coal chemical industry.

Description

technical field [0001] The invention belongs to the field of refractory materials, and in particular relates to a dense siliceous refractory material and a preparation method thereof. Background technique [0002] The invention is to develop a dense siliceous refractory material that can be used in the fields of metallurgical coke, coal chemical industry and the like. The siliceous refractory material has high density, high content of tridymite in the phase composition, and has good thermal conductivity and thermal shock resistance. [0003] The load deformation temperature of siliceous refractories (silica bricks) is high (1640 ° C ~ 1680 ° C), close to the melting point of tridymite and cristobalite (1690 ° C, 1730 ° C); high temperature strength; good high temperature volume stability; at a temperature of 570 Above ℃, no crystal transformation occurs. Silica bricks have a volume expansion of 1.5% to 2.2% from RT to 1450°C, which can compact the brick joints of the mason...

AI Technical Summary

Problems solved by technology

However, the density of silica bricks in my country is low and the content of tridymite is low, so the air tightness is poor, and the thermal conductivity and thermal shock resistance are also low.

[0004] The coke oven carbonization chamber and regenerator work periodically, and the temperature fluctuates greatly before and after coke discharge, causing thermal stress on the silica brick body, resulting in cracks in the silica brick body, loss of tissue looseness and strength, and gas leakage is prone to occur