Dense siliceous refractory material and preparation method thereof

Abstract

The invention relates to a dense siliceous refractory material and a preparation method thereof and belongs to the field of refractory materials. The refractory material is prepared from the followingraw materials in percentage by weight: 62.5 to 58.3 percent of crystalized silica particles with the size of 1.40 to 2.26 mm, 37.5 to 41.7 percent of crystalized silica particles with the size of 0.59 to 0.088 mm, 34 to 46 percent of mixed fine powder with the size smaller than or equal to 0.088 mm, 3 to 4 percent of a mineralizing agent and 3 to 10 percent of an additive. The preparation methodof the dense siliceous refractory material comprises the following steps: after carrying out dry mixing on the raw materials for 1 min, adding concentrated paper pulp waste liquid and mixing for 8 min; then kneading for 4 h, wherein the molding pressure of a blank is greater than or equal to 100 MPa; after drying the blank at 60 DEG C to 100 DEG C for 10 h, firing at the high temperature of 1400 to 1430 DEG C and carrying out heat insulation for 6 to 8 h. According to the siliceous refractory material provided by the invention, the density and the tridymite content are higher than those of a comparison sample; the invention can provides the novel siliceous refractory material for metallurgical coke and coal chemical industries.

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