A kind of preparation method of low-creep anti-crack silica brick

Abstract

The invention relates to a low-creeping and anti-cracking silicon brick preparation method, and belongs to the technical field of silicon brick preparation. The low-creeping and anti-cracking silicon brick preparation method comprises: preparing a mixing slurry from peat moss and lichen, infiltrating the mixing slurry into the pores of silica rock during a constant temperature culture process, and freezing with liquid nitrogen to ice the liquid in the pores, wherein the volume is increased to produce pressure, such that the pores of the silica rock are widened and deepened; carrying out microwave thawing, wherein the slurry deep enters the interior of the silica rock along the expanded pores so as to corrode the silica rock; freezing again, and crushing to crack up the silica rock; making the silica rock absorb a saturated calcium hydroxide solution at a low temperature; carrying out ultrasonic dispersion; at a high temperature, reducing the solubility of calcium hydroxide, and precipitating on the surface of the silica rock; and drying, mixing with peach gum and the like, and carrying out high temperature firing to obtain the product. According to the present invention, the prepared low-creeping and anti-cracking silicon brick has excellent creep resistance under the high temperature condition, has a starting refractoriness under load of 1700-1800 DEG C, has refractoriness of more than 1750 DEG C, and has broad application prospect.

Description

technical field [0001] The invention relates to a method for preparing low-creep and crack-resistant silica bricks, which belongs to the technical field of silica brick preparation. Background technique [0002] Silica brick is a kind of SiO 2 It is a traditional refractory product mainly composed of acidic refractories, which has high temperature volume stability, good thermal conductivity, excellent resistance to acid slag erosion, especially high softening temperature under load (only 30-50°C difference from refractoriness), etc. features. The main raw material for making silica bricks is silica (quartzite). Our country began to produce general silica bricks in the 1930s, and began to mass produce silica bricks for steelmaking open hearth furnaces and coke ovens in the early 1950s. For half a century, with the elimination of steelmaking open hearth furnaces, the use of silica bricks is currently mainly concentrated in coke ovens, blast furnaces and hot blast stoves. How...

AI Technical Summary

Problems solved by technology

[0004] The technical problem to be solved by the present invention is: in view of the problem that traditional silica bricks work under high temperature conditions for a long time during use, plastic deformation occurs after being pressed, the strength is greatly reduced, and even the brick body is cracked and damaged. A method for preparing low-creep and crack-resistant silica bricks by mixing and firing silica with peach gum after pretreatment and modification

During the firing process of the silica brick obtained in the present invention, the transformation speed of silica is uniform, the residual quartz content is less, and the creep resistance is excellent under high temperature conditions, which effectively solves the problem that traditional silica is easy to be deformed when working at high temperature for a long time