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Silica brick for glass furnace

A glass kiln and silica brick technology, applied in the field of refractory materials, can solve the problems of unmentioned product rate, service life and impurity content, high residual quartz content, cumbersome production process, etc., and achieve good high temperature performance and high SiO2 content , The effect of low apparent porosity

Active Publication Date: 2013-08-07
ZHEJIANG ZHAOSHAN SILICEOUS REFRACTORY MATERIAL
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The high-quality silica bricks currently on the market have high residual quartz content (3%), high apparent porosity (21%), and high true density (2.34g / cm 3 ), etc., thereby limiting its service life in long-term high-temperature environments, especially in large glass melting furnaces and float furnaces
[0004] Chinese patent CN102126866A discloses a high-purity siliceous refractory material suitable for masonry superstructures of oxy-fuel combustion glass furnaces and its production process. The refractory material described in it is SiO 2 High-purity silica bricks with a content of 97~98%, with SiO 2 Crystalline silica with a content greater than 98% is aggregate, SiO 2 Vein quartz or SiO with a content greater than 99% 2 Crystalline silica with a content greater than 98% is used as the matrix, and 0.3-1.5% of calcium mineralizer, 0.1-0.6% of iron oxide or manganese oxide mineralizer, and 0.03-1.0% of polycarboxylic acid chemical admixture are added Composed of an appropriate amount of calcium lignosulfonate binder, it is made after compounding, kneading, molding, drying and sintering. The refractory material has excellent high temperature resistance and corrosion resistance. ≤21.5%, true density≤2.332g / cm 3 , normal temperature compressive strength ≥ 47.6MPa, it mainly has the following deficiencies: 1) It mainly emphasizes the dispersant effect of the dispersant on the mineralizer in the mud. According to the general refractory production process, it belongs to the pouring molding method, and the molding method is curing, Demoulding, the production cycle is longer than that of press molding, and the process is more cumbersome; 2) The patent does not mention issues such as product rate, service life and impurity content; 3) Its formula is complicated, the production process is cumbersome, and the production cost is relatively high

Method used

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Embodiment 1

[0032] Silica bricks for glass kilns, the weight percentage of the components contained is: 30% of silica with a particle size of 3~1.0mm, 20% of silica with a particle size of 1.0~0.5mm, 50% of silica with a particle size of less than 0.5mm, and The total weight of the above components is 5% of additives and 2% of composite additives, of which SiO in silica 2 The content is not less than 99%, Al 2 o 3 Content not higher than 0.25% and Fe 2 o 3 The content is not higher than 0.45%; the additive is SiO 2 Waste silica material with a content of not less than 96%; the compound additive is a mixture of milk of lime, iron scale and calcium lignosulfonate.

Embodiment 2

[0034] Silica bricks for glass kilns, the weight percentage of the components contained is: 45% of silica with a particle size of 3~1.0mm, 5% of silica with a particle size of 1.0~0.5mm, 50% of silica with a particle size of less than 0.5mm, and The total weight of the above components is 15% of additives and 10% of composite additives, of which SiO in silica 2 The content is not less than 99%, Al 2 o 3 Content not higher than 0.25% and Fe 2 o3 The content is not higher than 0.45%; the additive is SiO 2 Waste silica bricks with a content of not less than 96%; the composite additive is a mixture of 75% milk of lime, 15% iron scale and 10% calcium lignosulfonate.

Embodiment 3

[0036] Silica bricks for glass kilns, the weight percentage of the components contained is: 45% of silica with a particle size of 3~1.0mm, 25% of silica with a particle size of 1.0~0.5mm, 30% of silica with a particle size of less than 0.5mm, and The total weight of the above components is 10% of additives and 8% of composite additives, of which SiO in silica 2 The content is not less than 99%, Al 2 o 3 Content not higher than 0.25% and Fe 2 o 3 The content is not higher than 0.45%; the additive is SiO 2 Waste silica material with a content of not less than 96%, waste quartz tubes with a particle size of 3~0.5mm; the composite additive is a mixture of 90% milk of lime, 3% iron scale and 7% calcium lignosulfonate.

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Abstract

The invention discloses a silica brick for a glass furnace, and belongs to the technical field of refractory materials. The silica brick for a glass furnace comprises: by weight, 30 to 45% of silica having particle sizes of 3 to 1.0mm, 5 to 25% of silica having particle sizes of 1.0 to 0.5mm, 30 to 50% of silica having particle sizes less than 0.5mm, an additive and a composite additive, wherein the weight of the additive is 5 to 15% of the total weight of the silica and the weight of the composite additive is 2 to 10% of the total weight of the silica. SiO2 content of the silica is great than or equal to 99%. Al2O3 content of the silica is less than or equal to 0.25%. Fe2O3 content of the silica is less than or equal to 0.45%. The additive is a waste silica material having SiO2 content great than or equal to 96%. The composite additive is a mixture of lime milk, mill scales and calcium lignosulphonate. The silica brick for a glass furnace has high SiO2 content, a high yield, low impurity content, low apparent porosity, good high-temperature performances and a long service life. A preparation technology of the silica brick for a glass furnace is simple and is suitable for large-scale production.

Description

technical field [0001] The invention relates to the technical field of refractory materials, in particular to silica bricks for glass furnaces. Background technique [0002] Glass furnace is a kind of melting device that glass manufacturing industry must have. It is usually made of refractory materials. Its investment is relatively large, accounting for about 1 / 3 of the total investment. Its importance can be imagined. Silica brick is a kind of SiO 2 The acidic refractory material as the main component has the characteristics of high temperature volume stability, excellent acid corrosion resistance, and high load softening temperature. It is mainly used in coke ovens, glass furnaces and non-ferrous metal smelting, among which silica bricks used in glass furnaces As long as it is used for its crown, the top of the hanging wall, and the front and rear walls. [0003] At present, the technical indicators of domestic silica brick manufacturers are basically maintained at the t...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B35/66C03B5/43
CPCC03B5/43Y02P40/57
Inventor 陈作夫陆宝根吴天鸣童丽萍
Owner ZHEJIANG ZHAOSHAN SILICEOUS REFRACTORY MATERIAL
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