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Method for producing calcium aluminate with waste aluminum gray

A technology of waste aluminum ash and calcium aluminate, which is applied in the field of metallurgical charge, can solve the problems of high silica content, low purity of calcium aluminate, difficult application, etc., and achieves the effects of low requirements, simple process and wide applicability.

Inactive Publication Date: 2008-05-07
SHANGHAI JIAO TONG UNIV
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  • Summary
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  • Description
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AI Technical Summary

Problems solved by technology

Its shortcoming is: using bauxite which is increasingly scarce in resources as a raw material, bauxite is inevitably brought into silica, and the content of silica in the synthesized calcium aluminate is relatively high
Its disadvantages are: the purity of the obtained product calcium aluminate is too low, the content of silicon dioxide is 9.15-12.44%, and the content of magnesium oxide is 8.59-11.34%, which is difficult to be applied; the amount of aluminum slag is only 10-20%, which is not the main raw material. The cost of raw materials such as metal aluminum and bauxite is still high

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0012] Main components of waste 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%, CaO4.51%. Calcium oxide main components: CaO content 92.35%.

[0013] Weigh 60 kg of waste aluminum ash and 40% of calcium oxide by weight percentage respectively, take 60 kg of waste aluminum ash and 40 kg of calcium oxide, add 10 kg of iron filings with 10% by weight, add 5 kg of 5% coke powder, mix well, put Smelting at high temperature for 60 minutes in a 400KVA electric arc furnace, pouring out and cooling, crushing and sorting the obtained calcium aluminate blocks.

[0014] In the produced calcium aluminate, Al 2 o 3 Content 41.6%, CaO content 50.51%, SiO 2 The content of MgO is 1.51%, and the content of MgO is 2.64%.

Embodiment 2

[0016] Main components of waste 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%, CaO4.51%. Calcium oxide main components: CaO content 94.35%.

[0017] Weigh 80 kg of waste aluminum ash and 20 kg of calcium oxide at 80% and 20% by weight respectively, plus 5 kg of iron filings with 5% by weight and 2 kg of coke powder with 2% by weight, mix evenly, and place in a 400KVA electric arc furnace Melting at high temperature for 75 minutes, pouring out and cooling, crushing and sorting the obtained calcium aluminate blocks.

[0018] In the produced calcium aluminate, Al 2 o 3 Content 53.42%, CaO content 38.87%, SiO 2 Content 1.21%, MgO content 3.05%.

Embodiment 3

[0020] Main components of waste 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%, CaO4.51%. Calcium oxide main components: CaO content 94.35%.

[0021] Weigh 70 kg of waste aluminum ash and 30 kg of bauxite according to 70% and 30% by weight respectively, add 7.5 kg of iron filings with a weight percentage of 7.5% and 3 kg of coke powder with a weight percentage of 3%, mix them evenly, and place them in a 400KVA electric arc furnace Melting at high temperature for 90 minutes, pouring out and cooling, crushing and sorting the obtained calcium aluminate blocks.

[0022] In the produced calcium aluminate, Al 2 o 3 Content 46.82%, CaO content 45.31%, SiO 2 Content 1.37%, MgO content 2.89%.

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Abstract

The invention relates to a method of utilizing wasted aluminum ash to produce calcium aluminate. The method comprises the steps as follows: wasted aluminum ash and calcium oxide are adopted as the raw materials; coke as the reducing agent and scrap iron as the settling agent are added, and smelted under high temperature in an electric arc furnace; the calcium aluminate produced after the melting is poured and cooled, and mulled and sieved, and utilized as the desulfurizer in making steel. The invention of simple technique does not require to process the wasted aluminum ash, which can instead bauxite to produce high-purity calcium aluminate, so that the invention reduces the production cost of the calcium aluminate, recycles the wasted aluminum ash which causes environmental pollution easily, and brings about remarkable comprehensive benefits socially and economically.

Description

technical field [0001] The invention relates to a method for producing calcium aluminate by using waste aluminum ash, and the obtained calcium aluminate can be used as a desulfurizer for smelting, belonging to the technical field of metallurgical charge. 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, the remaining waste aluminum ash still contains 15% to 30% of metal aluminum, because the grade of aluminum is low, generally no further aluminum is extracted and discarded. Waste aluminum ash is usually disposed of by landfill, which not only causes a waste of resources, but also may cause environmental pollution. [0003] Calcium aluminate is used as a desulfurizer in the produ...

Claims

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Application Information

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