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Method of producing electric melting magnesium aluminum spinel

A technology of fused magnesia aluminum spinel and electrofusion, applied in the field of materials, can solve the problems of difficult application, difficult to handle, complex composition of aluminum ash, etc., and achieve the effect of wide application prospects

Inactive Publication Date: 2007-02-28
SHANGHAI JIAO TONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Its shortcoming is that the aluminum oxide content of brown corundum demanded in the market is usually about 95%. Due to the complex composition of aluminum ash, the technical indicators of brown corundum produced instead of bauxite have not yet met the market requirements, and the application is difficult.
The aluminum ash used in this method is the waste aluminum ash extracted from overbasic aluminum chloride, which is not representative
In some areas, aluminum ash contains a large amount of magnesium oxide, which is difficult to process into a single corundum material by electromelting

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] Main ingredients of aluminum ash: Al 2 o 3 content 29.62%, Al content 22.58%, SiO 2 The content of MgO is 9.32%, and the content of MgO is 12.37%.

[0025] Aluminum ash is calcined at 1100°C, stirred in a water tank with 10% sulfuric acid at room temperature for 30 minutes, after drying, take 150 kg of aluminum ash, add 12 kg of coke and 15 kg of iron filings, mix evenly for smelting, and add it to the electric arc furnace , voltage 60V, current 1500A, smelting for 90 minutes, increase the current to 1800A, and finally add 30 kg of light burnt magnesia. After all the materials are melted, refine for 30 minutes. After cooling, crushing is carried out, and the crushed spinel is washed with water to remove dust and spinel fine powder, dehydrated, dried, and magnetically separated to remove magnetic substances.

[0026] The physical and chemical indicators of the obtained magnesium aluminum spinel are:

[0027] Al 2 o 3 Content 64.62%, MgO content 31.02%, SiO 2 Conte...

Embodiment 2

[0029] Main ingredients of aluminum ash: Al 2 o 3 Content 31.62%, Al content 22.35%, SiO 2 The content of MgO is 7.32%, and the content of MgO is 11.26%.

[0030] Aluminum ash is calcined at 1100°C, stirred in a water tank with 15% oxalic acid at room temperature for 30 minutes, after drying, take 150 kg of aluminum ash, add 12 kg of coke and 15 kg of iron filings, mix evenly for melting, and add it to the electric arc furnace , voltage 60V, current 1400A, smelting for 80 minutes, and finally adding 30 kg of light burnt magnesia, after all the materials are melted, refining for 30 minutes. After cooling, crushing is carried out, and the crushed spinel is washed with water to remove dust and spinel fine powder, dehydrated, dried, and magnetically separated to remove magnetic substances.

[0031] The physical and chemical indicators of the obtained magnesium aluminum spinel are:

[0032] Al 2 o 3 Content 65.12%, MgO content 30.52%, SiO 2 Content 1.35%, bulk density 3.41g / ...

Embodiment 3

[0034] Main component of aluminum ash: Al 2 o 3 content 26.62%, Al content 22.86%, SiO 2 The content of MgO is 10.32%, and the content of MgO is 11.67%.

[0035] Aluminum ash is calcined at 1100°C, stirred in a water tank with 20% concentration of sulfuric acid at room temperature for 30 minutes, after drying, take 150 kg of aluminum ash, add 12 kg of coke and 15 kg of iron filings, mix evenly for smelting, and add it to the electric arc furnace , voltage 60V, current 1600A, smelting for 100 minutes, and finally adding 30 kg of light burnt magnesia, and refining for 30 minutes after all the materials are melted. After cooling, crushing is carried out, and the crushed spinel is washed with water to remove dust and spinel fine powder, dehydrated, dried, and magnetically separated to remove magnetic substances.

[0036] The physical and chemical indicators of the obtained magnesium aluminum spinel are:

[0037] Al 2 o 3 Content 63.62%, MgO content 32.52%, SiO 2 Content 1.2...

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Abstract

The invention discloses a manufacturing method of electric melting magnesium aluminate spinel in the material technological domain, which comprises the following steps: sintering; placing non-disposed aluminum ash in the rotary kiln; placing aluminum ash in the groove; adding dilute acid; stirring; draining acid liquid; centrifuging; removing surface water at 200 deg.c; mixing aluminum, carbon element material and hammer slag with weight rate at 100:6-9:8-14 evenly; adding in the arc furnace; controlling pressure and current; reducing; reinforcing electric field; adding light-sintering magnesium sand with 65% Al2O3 and 30% MgO; refining; cooling the fused liquid; obtaining the magnesium aluminate spinel with Al2O3 between 63% and 67%; grinding the magnesium aluminate spinel; dehydrating; drying; proceeding magnetic cobbing.

Description

technical field [0001] The invention relates to a method in the technical field of materials, in particular to a method for producing fused magnesia-aluminum spinel by utilizing waste aluminum ash. Background technique [0002] A large amount of aluminum ash is produced in the process of aluminum production and processing, which has caused serious damage to the ecological environment, and has attracted great attention from all parties, forming a "green barrier" that restricts the development of my country's aluminum industry. The recycling of aluminum ash is the last link in the entire aluminum production and processing cycle chain. According to statistics, for every 1,000 tons of aluminum produced, about 25 tons of aluminum ash will be produced. The aluminum that can really be recycled can only account for about 10% to 30% of the weight of aluminum ash. After aluminum recycling, a large amount of waste aluminum ash will be accumulated in the factory area or landfilled, whic...

Claims

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Application Information

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IPC IPC(8): C01F7/16
Inventor 陈海䶮王俊孙宝德
Owner SHANGHAI JIAO TONG UNIV
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