Making process of electrofused mullite

A technology of fused mullite and its manufacturing method, which is applied in the field of ceramics and refractory materials, can solve problems such as incompleteness, complicated manufacturing process, and many amorphous phases.

Inactive Publication Date: 2007-06-06
SHANGHAI JIAO TONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Its disadvantages are: the sintering method is a solid phase reaction, it is difficult to carry out completely, there are many non-crystalline phases, which will affect the product quality, and the manufacturing process is more complicated
In further searches, no literature reports were found on the use of aluminum ash as raw material to produce fused mullite using the smelting process

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0011] Main ingredients of aluminum ash: Al 2 o 3 content 30.56%, Al content 29.58%, SiO 2 Content 10.21%, MgO content 5.34%, TiO 2 Content 2.42%, Fe 2 o 3 Content 2.23%, Na 2 O content 4.74%. Bauxite Al 2 o 3 Content 88.56%, SiO 2 Content 6.51%. SiO in silica 2 Content 98.30%.

[0012] After the aluminum ash was calcined at 1100°C for 3 hours, it was washed twice at room temperature in a water tank added with 10% hydrochloric acid, stirred for 20 minutes each time, and dried at 200°C. Weigh 120 kg of aluminum ash and 30 kg of silica according to the weight percentage of 80% and 20%, respectively, without adding alumina, electric melting at 1950-2100°C for 60 minutes, pouring out and cooling, crushing and sorting.

[0013] The obtained fused mullite had a content of 91.4%.

Embodiment 2

[0015] Main ingredients of aluminum ash: Al 2 o 3 Content 34.87%, Al content 26.52%, SiO 2 Content 9.23%, MgO content 5.62%, TiO 2 Content 1.67%, Fe 2 o 3 Content 2.62%, Na 2 O content 4.53%. Bauxite Al 2 o 3 Content 85.20%, SiO 2 Content 8.01%. SiO in silica 2 Content 98.30%.

[0016] The aluminum ash was calcined at 1100°C, washed twice at room temperature in a water tank added with 12% hydrochloric acid, stirred for 20 minutes each time, and dried at 200°C. Weigh 60 kg of aluminum ash, 75 kg of bauxite and 15 kg of silica according to the weight percentage of 40%, 50% and 10%, respectively, electric melting at 1900-2100°C for 75 minutes, pouring out and cooling, crushing and sorting.

[0017] The obtained fused mullite had a content of 90.3%.

Embodiment 3

[0019] Main ingredients of aluminum ash: Al 2 o 3 Content 34.87%, Al content 26.52%, SiO 2 Content 9.23%, MgO content 5.62%, TiO 2 Content 1.67%, Fe 2 o 3 Content 2.62%, Na 2 O content 4.53%. Bauxite Al 2 o 3 Bauxite Al 2 o 3 Content 88.56%, SiO 2 Content 6.51%. SiO in silica 2 The content is 98.3%.

[0020] After the aluminum ash is calcined at 1000°C, it is washed twice at room temperature in a water tank with 15% hydrochloric acid, stirred for 20 minutes each time, and dried at 200°C. Weigh 75 kg of aluminum ash, 52.5 kg of bauxite and 22.5 kg of silica respectively according to 50%, 35% and 15% by weight, electro-melt at 1950-2100°C for 90 minutes, pour out and cool, crush and separate.

[0021] The obtained fused mullite had a content of 92.8%.

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Abstract

The present invention relates to ceramic and refractory material technology, and is especially making process of electrofused mullite. The making process includes the following steps: 1. the waste aluminum ash pre-treating step comprising calcining waste aluminum ash at 1100 deg.c to convert partial Al into Al2O3, washing with hydrochloric acid and stoving; and 2. the electrofusing step comprising mixing aluminum ash 30-80 wt%, alum 0-50 wt% and silica 10-20 wt%, smelting in an arc furnace, cooling outside the furnace, crushing and sorting. The present invention has low production cost and can eliminate environmental pollution caused by waste aluminum ash.

Description

technical field [0001] The invention relates to a method in the technical field of ceramics and refractory materials, in particular to a method for manufacturing fused mullite. Background technique [0002] In recent years, my country's aluminum industry has developed rapidly, and its output has continued to grow. It has become a major aluminum producer in the world. A large amount of aluminum ash waste is produced during aluminum smelting. According to statistics, for every 1,000 tons of aluminum produced, about 25 tons of aluminum ash will be produced. In Shanghai alone, about 50,000 tons of waste aluminum ash are produced every year. In recent years, a variety of channels have been developed for the recycling of waste aluminum ash, such as secondary refining to extract aluminum, and synthesis of polyaluminium chloride (water purifier), etc. secondary pollution. [0003] Found through literature search to prior art, Shi Zhenke etc. published " the mullite crystal phase s...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/185C04B35/622C04B35/66
Inventor 陈海䶮王俊孙宝德
Owner SHANGHAI JIAO TONG UNIV
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