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Method for producing using aluminum gray and coal gangue composite castoff

A technology of aluminum-silicon alloy and coal gangue, which is applied in the direction of improving process efficiency, etc., can solve the problems of high iron content, high impurity content, and inability to melt and mix aluminum-silicon alloy in aluminum-silicon alloy, and achieve the effect of low impurity element content.

Inactive Publication Date: 2008-09-24
SHANGHAI JIAO TONG UNIV +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Silica, silica sand, clay, bentonite and aluminum ash have a high content of impurities, coupled with the metal iron brought in by the self-baking electrode, the iron content in the aluminum-silicon alloy is too high, and this product can only be used for steelmaking. Deoxidizer, cannot be used to melt Al-Si alloy

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] The aluminum ash is pretreated by magnetic separation and iron removal, and the main component weight percentage of the aluminum ash after pretreatment is: Al 2 o 3 Content 35.65%, Al content 25.60%, SiO 2 Content 10.52%, MgO content 7.82%, TiO 2 Content 2.31%, Fe 2 o 3 The content of CaO is 1.68%, and the content of CaO is 3.78%.

[0022] Coal gangue is preferred, and it is ground to a particle size of less than 40 mesh, and pretreated by magnetic separation to remove iron. The main component weight percentage of coal gangue after pretreatment: Al 2 o 3 Content 32.82%, SiO 2 Content 36.46%, TiO 2 Content 0.35%, Fe 2 o 3 Content 0.23%, CaO content 0.17%, fixed carbon 14.50%.

[0023] 15% of aluminum ash, 75% of coal gangue and 10% of petroleum coke are prepared according to the weight percentage, plus 18% of the weight of the raw material pulp waste liquid, mixed evenly, pelletized and dried. The dried pellets and rice husk charcoal are mixed together and pl...

Embodiment 2

[0026] The aluminum ash is pretreated by magnetic separation and iron removal, and the main component weight percentage of the aluminum ash after pretreatment is: Al 2 o 3 Content 35.65%, Al content 25.60%, SiO 2 Content 10.52%, MgO content 7.82%, TiO 2 Content 2.31%, Fe 2 o 3 Content 1.68%, CaO content 3.78%.

[0027] Coal gangue is preferred, and it is ground to a particle size of less than 40 mesh, and pretreated by magnetic separation to remove iron. The main component weight percentage of coal gangue after pretreatment: Al 2 o 3 Content 32.82%, SiO 2 Content 36.46%, TiO 2 Content 0.35%, Fe 2 o 3 Content 0.23%, CaO content 0.17%, fixed carbon 14.50%.

[0028] 20% of aluminum ash, 70% of coal gangue and 10% of petroleum coke are prepared according to the weight percentage, plus 16% of the weight of the raw material pulp waste liquid, mixed evenly, pelletized and dried. The dried pellets and rice husk charcoal are mixed together and placed in a 400KVA single-elec...

Embodiment 3

[0031] The aluminum ash is pretreated by magnetic separation and iron removal. After pretreatment, the main component weight percentage of aluminum ash is: Al 2 o 3 Content 35.65%, Al content 25.60%, SiO 2Content 10.52%, MgO content 7.82%, TiO 2 Content 2.31%, Fe 2 o 3 The content of CaO is 1.68%, and the content of CaO is 3.78%.

[0032] Coal gangue is preferred, and it is ground to a particle size of less than 40 mesh, and pretreated by magnetic separation to remove iron. The main component weight percentage of coal gangue after pretreatment: Al 2 o 3 Content 32.82%, SiO 2 Content 36.46%, TiO 2 Content 0.35%, Fe 2 o 3 Content 0.23%, CaO content 0.17%, fixed carbon 14.50%.

[0033] 10% of aluminum ash, 80% of coal gangue and 10% of petroleum coke are prepared according to the weight percentage, plus 19% of the raw material weight of pulp waste liquid, mixed evenly, pelletized and dried. The dried pellets and rice husk charcoal are mixed together and placed in a 40...

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Abstract

The invention discloses a production method of Aluminum-Silicon alloy in the field of metallurgy technology by utilizing a composite waste including aluminum ash and coal gangue, which has the procedures as follows: the first step is the material preparation and the pretreatment of raw material, i.e. iron removal by magnetic separation pretreatment for aluminum ash, optimal selection and milling to the granularity of smaller than 40 meshes and iron removal by magnetic separation pretreatment on coal gangue; the second step is proportioning and briquetting, i.e. proportioning according to the following weight percent including 5 to 25 percent of aluminum ash, 60 to 95 percent of coal gangue and 0 to 15 percent of petroleum coke, adding 15 to 20 percent by the weight of raw material of waste pulp with as binder, mixing the material to briquette and baking to moisture of below 2 percent; the third step is preparation of Aluminum-Silicon alloy by using electrothermal method. The invention overcomes the component limitation of one solid waste, not only decreases the cost of Aluminum-Silicon alloy and but also consumes the wastes which easily cause the environmental pollution.

Description

technical field [0001] The invention relates to a method for producing an aluminum-silicon alloy in the field of metallurgy technology, in particular to a method for producing an aluminum-silicon alloy by using composite waste of aluminum ash and coal gangue. Background technique [0002] At present, there are two methods for producing aluminum-silicon alloys in the world, namely blending method and electrothermal method. The blending method is prepared by melting and blending the metal aluminum produced by electrolysis and the industrial silicon produced by the electrothermal method; the electrothermal method is to directly reduce the raw materials containing alumina and silicon dioxide at high temperature to obtain an aluminum-silicon alloy once. Refining, and then preparing various grades of aluminum-silicon alloys. At present, the aluminum-silicon alloy produced in my country is made by blending, which has high energy consumption and high production cost. The productio...

Claims

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Application Information

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IPC IPC(8): C22B7/00C22B4/02C22B4/06C22B1/242C22B21/02
CPCY02P10/20
Inventor 陈海䶮黄耀滨王俊孙宝德
Owner SHANGHAI JIAO TONG UNIV
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