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Method for producing calcium hexaluminate with waste aluminum ash

A technology of calcium hexaaluminate and waste aluminum ash, which is applied in the field of producing calcium hexaaluminate by using waste aluminum ash, can solve the problems of low production efficiency, complicated process, difficult application, etc., and achieves low requirements, simple process and applicable sexually widespread effect

Inactive Publication Date: 2009-01-28
SHANGHAI JIAO TONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Its disadvantages are: the use of alumina as a raw material with high cost and increasingly scarce resources, and the process is complicated, the production efficiency is not high, and it is difficult to be applied

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0015] Main components of waste aluminum ash: Al 2 o 3 content 30.56%, Al content 39.58%, SiO 2 Content 5.21%, MgO content 5.34%, TiO 2 Content 0.42%, Fe 2 o 3 Content 1.23%, CaO2.51%. Calcium oxide main components: CaO content 92.35%.

[0016] Weigh 80 kg of waste aluminum ash and 20% of calcium oxide as raw materials respectively by weight percentage, add 10 kg of iron filings of 10% of the total weight of raw materials, and add coke powder of 5% of the total weight of raw materials 5 kg, mixed evenly, placed in a 400KVA electric arc furnace for high-temperature melting for 60 minutes, poured out and cooled, and the obtained calcium aluminate blocks were crushed and separated.

[0017] In the produced calcium aluminate, Al 2 o 3 Content 77.6%, CaO content 16.51%, SiO 2 The content of MgO is 1.51%, and the content of MgO is 2.64%.

Embodiment 2

[0019] Main components of waste aluminum ash: Al 2 o 3 content 30.56%, Al content 39.58%, SiO 2 Content 5.21%, MgO content 5.34%, TiO 2 Content 0.42%, Fe 2 o 3 Content 1.23%, CaO2.51%. Calcium oxide main components: CaO content 94.35%.

[0020] Weigh 95 kg of waste aluminum ash and 5 kg of calcium oxide according to 97% and 3% of the weight percentage respectively, plus 15 kg of iron filings of 15% of the total weight of raw materials and 7 kg of coke powder of 7%, mix evenly, and place in a 400KVA electric arc Melting in the furnace at high temperature for 75 minutes, pouring out and cooling, crushing and sorting the obtained calcium aluminate blocks.

[0021] In the produced calcium aluminate, Al 2 o 3 Content 90.42%, CaO content 3.87%, SiO 2 Content 1.21%, MgO content 3.05%.

Embodiment 3

[0023] Main components of waste aluminum ash: Al 2 o 3 content 30.56%, Al content 39.58%, SiO 2 Content 5.21%, MgO content 5.34%, TiO 2 Content 0.42%, Fe 2 o 3 Content 1.23%, CaO2.51%. Calcium oxide main components: CaO content 94.35%.

[0024] Weigh 90 kg of waste aluminum ash and 10 kg of calcium oxide according to 90% and 10% of the weight percentage respectively, plus 12.5 kg of iron filings of 12.5% ​​of the total weight of raw materials and 6 kg of coke powder of 6%, mix evenly, and place in a 400KVA electric arc Smelting in the furnace at high temperature for 90 minutes, pouring out and cooling, crushing and sorting the obtained calcium aluminate blocks.

[0025] In the produced calcium aluminate, Al 2 o 3 Content 85.82%, CaO content 8.31%, SiO 2 Content 1.37%, MgO content 2.89%.

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Abstract

The invention relates to a method for producing calcium aluminate by waste aluminium dross. In the method, according to weight proportion the waste aluminium dross accounting for 80-97% and calcium oxide accounting for 3-20% are taken as raw materials (the total proportion thereof is 100%), uniformly mixed with a reducing agent accounting for 5-5% of the total weight of the raw materials and a precipitating agent accounting for 10-15% of the total weight of the raw materials and smelted in an electric arc furnace to obtain calcium hexaluminate, and the smelted calcium hexaluminate is poured out, cooled, crushed and separated. The method has simple and convenient process and can replace bauxite to produce high-purity calcium aluminate without treating the waste aluminium dross, thus the production cost of the calcium aluminate is reduced, and the waste aluminium dross which easily causes environmental pollution is utilized.

Description

technical field [0001] The invention relates to a preparation method in the technical field of refractory materials, in particular to a method for producing calcium hexaaluminate by utilizing waste aluminum ash. Background technique [0002] From the melting of metal aluminum, aluminum slag will inevitably become a by-product, accounting for about 3-5% of the total weight of aluminum melt. Aluminum slag is an important source of recycled aluminum. The freshly released aluminum slag usually contains 50%-70% % of metal aluminum, after conventional recycling treatment, the remaining waste aluminum ash still contains 15% to 40% of metal aluminum. Because the grade of aluminum is low, it is generally discarded without further extraction of aluminum. Waste aluminum ash is usually disposed of by landfill, which not only causes a waste of resources, but also may cause environmental pollution. [0003] In the field of metallurgy and building materials, calcium aluminate is an emergi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01F7/16
Inventor 孙宝德陈冲陈海䶮王俊陈海
Owner SHANGHAI JIAO TONG UNIV
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