Preparation method of silica bricks for hot blast stove

A hot blast stove and silica brick technology, which is applied in the field of refractory materials for hot blast stoves, can solve the problems of reduction, cumbersome production process, and fluorite in the raw material formula, and achieve the effects of reducing volume expansion, simplifying the production process, and reducing production costs

Active Publication Date: 2015-11-11
REFRACTORY MATERIAL OF SINOSTEEL CORP
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  • Abstract
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  • Claims
  • Application Information

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Problems solved by technology

[0003] The technical problem to be solved by the present invention is to provide a method for preparing silica bricks for hot blast stoves, which overcomes the problems of a wide variety of additives in the production of silica bricks for hot blast stoves, complicated production processes, and the fact that the raw mate

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  • Preparation method of silica bricks for hot blast stove

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Embodiment 1

[0042] Silica bricks for hot blast stoves, the weight percentages of the components are: 28% of silica with a particle size of 2.18mm, 41% of silica with a particle size of 1.65mm, 10% of silica with a particle size of 2 Content≥98%, Fe 2 o 3 Content≤0.50%, Al 2 o 3 Content≤0.5%. Waste brick clinker is SiO 2Waste silica clinker with a content of not less than 94.5%. The addition of composite additives is 6.5%, which is a mixture of lime, iron scale and water. The content of CaO in the composite additives is 25%, and the content of iron scale is 5%; the addition of special additives is 3.7%, and the mass percentage of each component For: bentonite: 25%, calcium hydroxide powder: 30%, clay: 20%, feldspar powder: 10%. The addition of pulp is 0.8%.

[0043] The firing process is:

[0044] (1) Weigh silica, waste brick clinker, and special additives according to the composition ratio of the above claims, and dry mix them uniformly in a wet mill to form a mixture A, and weigh...

Embodiment 2

[0050] Silica bricks for hot blast stoves, the mass parts of the components are: 30 parts of silica with a particle size of 2.18mm, 28 parts of silica with a particle size of 1.65mm, 18 parts of silica with a particle size of 2 Content≥98%, Fe 2 o 3 Content≤0.50%, Al 2 o 3 Content≤0.5%. Waste brick clinker is SiO 2 Waste silica clinker with a content of not less than 94.5%. The addition of composite additive is 7.0%, which is a mixture of lime, iron scale and water. In the composite additive, CaO: 27%, the content of iron scale is 4%; the special additive is 4.5%, and the mass percentage of each component is: Bentonite: 35%, calcium hydroxide powder 35%, clay: 25%, feldspar powder: 20%. The amount of pulp added was 1.2%. Using calcium hydroxide powder instead of fluorite has low cost, no toxic and side effects, simple preparation process, excellent product performance, and is suitable for mass production.

[0051] The firing process is:

[0052] (1) Weigh silica, waste...

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Abstract

The invention discloses a preparation method of silica bricks for a hot blast stove. The silica bricks comprise 20-35% of silica with the granularity of 2.18 mm, 40-50% of silica with the granularity of 1.65 mm, 10-20% of silica with the granularity smaller than 0.1 mm, 10-20% of waste silicon dioxide clinker, 0.5-1.5% of paper pulp, 6-8% of composite addition agent and 2.5-5% of special additive. The composite addition agent comprises 24.0-28.0% of CaO and 3.5-6.0% of iron scales. The special additive is a mixture of bentonite, Ca(OH)2 powder, clay and feldspar. Powder is added with the composite addition agent and water to be dispersed into slurry B, the paper pulp is added, and the mixture is ground into mud; compression moulding is performed; firing is performed at 1420-1460 DEG C after drying, and then the silica bricks are formed. The kinds of additives are reduced, the production process is simplified, and the probability of production errors is reduced; the waste silicon dioxide clinker can reduce volume expansion in crystal type transformation of quartz, reduce cracks of the silica bricks and increase the finished product rate.

Description

technical field [0001] The invention relates to a technology of refractory materials for hot blast stoves, in particular to a method for preparing silica bricks for hot blast stoves. Background technique [0002] At present, the traditional raw material formula for the production of silica bricks for hot blast stoves is a certain amount of silica granules, a certain amount of silica fine powder, plus additives such as feldspar, fluorite, clay, etc., and then add pulp, lime milk, Iron scale powder, etc. The weighing ratio of too many kinds of substances in the raw material formula makes the production process cumbersome, and a little carelessness will cause production errors and affect the product quality. Moreover, the underground reserves of fluorite in the raw material formula are limited, and the market price is high. And it is highly corrosive during use, which is not conducive to protecting the environment. Contents of the invention [0003] The technical problem to...

Claims

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Application Information

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IPC IPC(8): C04B35/66
Inventor 吕桂英刘勇
Owner REFRACTORY MATERIAL OF SINOSTEEL CORP
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