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Process of refining aluminium silicon alloy from coal gangue or flyash

A technology of aluminum-silicon alloy and fly ash, which is applied in the field of extraction to achieve good economic benefits, cost reduction, and low cost

Inactive Publication Date: 2008-10-15
山西泰尔钢铁有限公司 +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] The purpose of the present invention is to propose a method for refining the aluminum-silicon alloy produced with coal gangue or fly ash as raw material, which solves the problem of the crude aluminum-silicon alloy produced from coal gangue or fly ash by the carbothermal reduction method. Then it is formulated into a cast aluminum-silicon alloy by the dilution method

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  • Process of refining aluminium silicon alloy from coal gangue or flyash

Examples

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Embodiment 1

[0042] Example 1: Refining Al-Si Alloy from Coal Gangue

[0043]After mixing 80wt% coal gangue, 15wt% coke, and 5wt% calcium lignosulfonate with a particle size of less than 0.5mm, they are put into a pelletizing device for pelletizing, and the pellet particle size is 100mm; ℃ for drying, and the water content is less than 1wt%; then the dried pellets are put into the submerged arc furnace, and the crude aluminum-silicon alloy is produced by the submerged thermal method;

[0044] The crude aluminum-silicon alloy prepared in the first step is transported to the first reaction furnace by ladle, and the dehydrated and dried sodium chloride and cryolite mixed flux (the weight ratio of sodium chloride and cryolite is 8:2) Remove slag, keep warm at 1000°C after treatment; add metal manganese blocks with a purity of 99.99%, and use electromagnetic stirring for 20 minutes; then adopt a gradient cooling method of 35°C / min to cool down to 590°C to obtain an aluminum-silicon alloy with ...

Embodiment 2

[0050] Example 2: Refining Al-Si Alloy from Coal Gangue

[0051] After mixing 65wt% coal gangue, 20wt% bituminous coal, and 15wt% sulfite pulp waste liquid with a particle size of less than 0.5mm, put them into the pelletizing equipment for pelletizing, and the pellet particle size is 110mm; ℃ for drying, and the water content is less than 1wt%; then the dried pellets are put into the submerged arc furnace, and the crude aluminum-silicon alloy is produced by the submerged thermal method;

[0052] The crude aluminum-silicon alloy prepared in the first step is transported to the first reaction furnace by ladle, and the dehydrated and dried sodium chloride and cryolite mixed flux (the weight ratio of sodium chloride and cryolite is 7:3) Remove slag, keep warm at 950°C after treatment; add metal manganese blocks with a purity of 70.00%, and use electromagnetic stirring for 25 minutes; then use a gradient cooling method of 25°C / min to cool down to 610°C to obtain an aluminum-sili...

Embodiment 3

[0058] Example 3: Refining Al-Si Alloy from Coal Gangue

[0059] After mixing 75wt% coal gangue with a particle size of less than 0.5mm, 18wt% bituminous coal and petroleum coke in a weight ratio of 8:2, and 7wt% magnesium lignosulfonate, put it into a pelletizing device for pelletizing, and the pellet size is 120mm; Then the obtained pellets are dried at 300°C, and the water content is less than 1wt%; then the dried pellets are put into a submerged arc furnace, and a crude aluminum-silicon alloy is produced by a submerged thermal method;

[0060] The crude aluminum-silicon alloy prepared in the first step is transported to the first reaction furnace through ladle, and dehydrated and dried sodium chloride and cryolite mixed flux (the weight ratio of sodium chloride and cryolite is 6:4) is used for dehydration. slag, heat preservation at 900°C after treatment; add metal manganese blocks with a purity of 90.00%, and use electromagnetic stirring for 20 minutes; then use a gradi...

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Abstract

The process of refining Al-Si alloy with coal gangue or fly ash includes the following steps: 1. eliminating slag in conventional method, compounding with certain amount of manganese block in the first reaction furnace via electromagnetic stirring, lower the temperature gradiently to 590-610 deg.c to obtain Al-Si alloy and Mn-Si-Ti-Fe compound in laminated structure; and 2. filtering in the second reaction furnace with porous filtering ceramic layer in a funnel at the negative pressure of 800-1000 Pa, compounding with required alloy elements, and casting ingot with Al content over 85 %. The process operates based on the eutectic temperature property of Al-Si alloy to eliminate Si, Ti and Fe, and has short production process, low cost and no industrial waste.

Description

technical field [0001] The present invention relates to an extraction method, more particularly, refers to a method for refining aluminum-silicon alloy from coal gangue or fly ash. Background technique [0002] At present, aluminum-silicon alloys in my country are produced by blending method, that is, primary aluminum produced by molten salt electrolysis and industrial silicon produced by carbothermal method are remelted and mixed in proportion. In this way, the process from ore to finished product must go through many processes such as alumina plant, electrolytic aluminum plant, and industrial silicon plant. The production process is long and energy-consuming, which makes the cost of aluminum-silicon alloy remain high, and the production process has a great impact on the environment. In order to reduce the production cost of aluminum-silicon alloys, it has been reported that aluminum-silicon ores such as bauxite and other high-alumina minerals are used as raw materials to p...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C1/02C22B1/14C22B1/242C22C21/02
Inventor 卢惠民种震山
Owner 山西泰尔钢铁有限公司
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