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

A low-creep, silica brick technology, which is applied in the field of preparation of low-creep crack-resistant silica bricks, can solve the problems of brick cracking and damage, strength reduction, plastic deformation of silica, etc., and achieves broad application prospects and excellent creep resistance Effect

Active Publication Date: 2020-02-11
YIXING KAIDA REFRACTORY MATERIALS CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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

Method used

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Examples

Experimental program
Comparison scheme
Effect test

example 1

[0016] First, weigh 200g of peat moss and 280g of cup-shaped lichen in sequence, pour them into a stone mill, and grind for 15 minutes. During the grinding process, mix 2800mL of water to obtain a mixed slurry, then add 1200mL of the resulting mixed slurry and 500g of 60 mesh silica to the beaker. After stirring and mixing with a glass rod for 15 minutes, transfer the beaker into a constant temperature incubator, and cultivate at a constant temperature for 7 days at a temperature of 25°C; the silica content in the silica is greater than 99%; after the above cultivation is completed, Filter the material in the above beaker, collect the filter cake, freeze the obtained filter cake with liquid nitrogen for 4 minutes, then transfer the frozen filter cake to a microwave heater, and thaw it for 5 minutes under the condition of a power of 600W, and then freeze the thawed filter cake Put the filter cake into a beaker containing 1100mL of the above-mentioned mixed slurry, and place the ...

example 2

[0019] First, weigh 150g of sphagnum moss and 160g of cup-shaped lichen in sequence, pour them into a stone mill, grind for 10 minutes, mix in 2200mL of water during the grinding process, and obtain a mixed slurry, then add 1000mL of the resulting mixed slurry and 400g of 40 mesh silica to the beaker After stirring and mixing with a glass rod for 10 minutes, transfer the beaker into a constant temperature incubator, and cultivate at a constant temperature for 5 days at a temperature of 20°C; the silica content in the silica is greater than 99%; after the above cultivation is completed, Filter the material in the above beaker, collect the filter cake, freeze the obtained filter cake with liquid nitrogen for 2 minutes, then transfer the frozen filter cake to a microwave heater, thaw it for 3 minutes under the condition of power of 400W, and then freeze the thawed filter cake Put the filter cake into a beaker containing 900mL of the mixed slurry obtained above, and place the beake...

example 3

[0022] First, weigh 170g of peat moss and 200g of cup-shaped lichen in sequence, pour them into a stone mill, and grind for 12 minutes. During the grinding process, 2400mL of water is mixed to obtain a mixed slurry. Then add 1100mL of the obtained mixed slurry and 450g of 50-mesh silica to the beaker. After stirring and mixing with a glass rod for 12 minutes, transfer the beaker into a constant temperature incubator, and cultivate at a constant temperature for 6 days at a temperature of 22°C; the silica content in the silica is greater than 99%; after the above cultivation is completed, Filter the material in the above beaker, collect the filter cake, freeze the obtained filter cake with liquid nitrogen for 3 minutes, then transfer the frozen filter cake to a microwave heater, thaw it for 4 minutes under the condition of power of 500W, and then freeze the thawed filter cake Put the filter cake into a beaker containing 1000mL of the above-mentioned mixed slurry, and place the be...

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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...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B35/14C04B35/66
CPCC04B35/14C04B35/66C04B2235/3208C04B2235/3272C04B2235/608C04B2235/96C04B2235/9623
Inventor 何迎春薛洋许丽君
Owner YIXING KAIDA REFRACTORY MATERIALS CO LTD
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