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High-purity, high-alkali-resistance and low-thermal-expansion silicon bricks using cristobalite as main crystal phase and production method thereof

A low thermal expansion, pure square technology, applied in the field of refractory material manufacturing, can solve the problems of high impurity content, incomplete crystal transformation, poor alkali erosion resistance, etc., achieve high alkali resistance, improve thermal shock stability, and low expansive effect

Inactive Publication Date: 2019-05-24
LUOYANG MAILE REFRACTORY CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to overcome the problems in the prior art, such as high impurity content of traditional silica bricks, poor alkali corrosion resistance, incomplete crystal transformation, etc. Quartz main crystal phase high-purity silica brick and preparation method thereof

Method used

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  • High-purity, high-alkali-resistance and low-thermal-expansion silicon bricks using cristobalite as main crystal phase and production method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] A high-purity cristobalite high-alkali-resistant low-thermal-expansion silica brick, the particle size composition and addition ratio of each raw material are:

[0029] 40 parts of fused silica aggregate with particle size ≤5mm, 51 parts of fused silica fine powder with particle size ≤0.09mm, zirconium-containing SiO with particle size ≤0.001mm 2 3 parts of fine powder, 3 parts of nano-silica sol binder, 1 part of boric acid fine powder, 1.5 parts of dextrin, 0.5 parts of sodium tripolyphosphate and sodium hexametaphosphate binder.

Embodiment 2

[0031] A high-purity cristobalite high-alkali-resistant low-thermal-expansion silica brick, the particle size composition and addition ratio of each raw material are:

[0032] 35 parts of fused silica aggregate with particle size ≤5mm, 53 parts of fused silica fine powder with particle size ≤0.09mm, zirconium-containing SiO with particle size ≤0.001mm 2 5 parts of fine powder, 4 parts of nano-silica sol binder, 1.5 parts of boric acid fine powder, 1 part of dextrin, 0.5 parts of sodium tripolyphosphate and sodium hexametaphosphate binder.

Embodiment 3

[0034] A high-purity cristobalite high-alkali-resistant low-thermal-expansion silica brick, the particle size composition and addition ratio of each raw material are:

[0035] 44 parts of fused silica aggregate with a particle size of ≤5mm, 43 parts of fused silica fine powder with a particle size of ≤0.09mm, zirconium-containing SiO with a particle size of ≤0.001mm 2 8 parts of fine powder, 2 parts of nano-silica sol binder, 2.5 parts of boric acid fine powder, and 0.5 part of dextrin.

[0036]The preparation process of embodiments 1, 2, and 3 is as follows: batching is carried out according to the above ratio, after the weighed materials are dry-mixed in a mixing mixer for 5-10 minutes, the added liquid additive mixture is wet-mixed for 10 minutes, and then mixed at a high speed for 10 minutes. minute. Press molding; drying at 80-120°C for 12-36h; firing temperature at 1200-1400°C, holding time for 18-25h. That is, the high-purity cristobalite high-alkali-resistant low-the...

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Abstract

The invention discloses high-purity, high-alkali-resistance and low-thermal-expansion silicon bricks using cristobalite as the main crystal phase and a production method thereof. The production methodincludes: using fused quartz aggregates, fused quartz fine powder, zirconium-containing SiO2 micro-powder and dextrin as the raw materials; adding boric acid, a nano silica sol binding agent, sodiumtripolyphosphate and a sodium hexametaphosphate binding agent; mixing, performing compression moulding, drying, and performing a special high-temperature sintering process to obtain the high-purity, high-alkali-resistance and low-thermal-expansion silicon bricks using cristobalite as the main crystal phase. The production method has the advantages that the crystallization speed and degree of quartz glass are controlled effectively by using reasonable sintering temperature and heat preservation time, product mineral phase comprises both quartz glass and cristobalite, and optimal performance isachieved by the component proportion of the mineral phase.

Description

technical field [0001] The invention relates to the technical field of refractory material manufacture, in particular to a high-purity cristobalite high-alkali-resistance low-thermal-expansion silica brick and a preparation method thereof. Background technique [0002] The use of traditional silica bricks in glass kilns has difficult problems: because mineralizers must be added in the production of traditional silica bricks, it is difficult to improve the alkali erosion resistance of traditional silica bricks. [0003] When preparing silica bricks, there are a small amount of iron oxide and alumina in the raw materials, and at least 2.0% calcium oxide mineralizer is added, which makes the silica bricks unable to do what they want in the all-oxygen combustion furnace and high boron glass melting furnace. Since there is no nitrogen in the atmosphere of the oxy-fuel combustion furnace, the total amount of exhaust gas decreases and the concentration increases. In addition, the e...

Claims

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Application Information

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IPC IPC(8): C04B35/66C04B35/14C04B35/622C04B35/64
Inventor 王鸿妹曹红飞肖士珺
Owner LUOYANG MAILE REFRACTORY CO LTD
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