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Method for removing impurities from aluminum ash

A technology of aluminum ash slag and aluminum hydroxide, applied in chemical instruments and methods, aluminum compounds, inorganic chemistry, etc., can solve the problems of high material consumption and energy consumption, high impurity content, large pollution, etc., achieve high efficiency of impurity removal, prevent The effect of low corrosion requirements and simple steps

Inactive Publication Date: 2017-05-31
NORTHWEST A & F UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] Aiming at the problems of large pollution, high material consumption and energy consumption, high impurity content and the like in the removal of aluminum ash, the present invention proposes a method for removing impurities from aluminum ash

Method used

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  • Method for removing impurities from aluminum ash

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Effect test

Embodiment 1

[0024] Step (1): After grinding, sieving, washing (deionized water), the aluminum ash residue is roasted to obtain roasted powder with a certain particle size; wherein the screening condition is 20 mesh; the washing condition is: washing temperature 80 ℃, water washing time 7h; calcination conditions: calcination time 4h, calcination temperature 650℃.

[0025] Step (2): Add the calcined powder to the NaOH solution, heat and stir for a period of time, and perform solid-liquid separation through filtration to obtain an aluminum alkali solution; wherein the NaOH solution has a concentration of 40% by weight, a liquid-solid mass ratio of 4:1, and alkali-soluble Time 4h, alkali melting temperature 150℃.

[0026] Step (3): Add excess dilute hydrochloric acid to the aluminum alkali solution, observe the precipitation in the solution until the amount of precipitation does not change, and then perform solid-liquid separation by filtration to obtain AlCl 3 The filtrate; wherein the concentra...

Embodiment 2

[0029] Step (1): After grinding, sieving and washing (deionized water) the aluminum ash residue, roasting is performed to obtain roasted powder with a certain particle size; wherein the screening condition is 20 mesh; the washing condition is: washing temperature 90 ℃, water washing time 6h; calcination conditions: calcination time 3.5h, calcination temperature 700 ℃.

[0030] Step (2): Add the calcined powder to the NaOH solution, heat and stir for a period of time, and then perform solid-liquid separation by filtration to obtain an aluminum alkali solution; wherein the NaOH solution has a concentration of 40% by weight, a liquid-solid mass ratio of 5:1, and alkali-soluble Time 4h, alkali melting temperature 180℃.

[0031] Step (3): Add excess dilute hydrochloric acid to the aluminum alkali solution, observe the precipitation in the solution until the amount of precipitation does not change, and then perform solid-liquid separation by filtration to obtain AlCl 3 The filtrate; wher...

Embodiment 3

[0034] Step (1): After grinding, sieving and washing the aluminum ash (deionized water), roasting is performed to obtain roasted powder with a certain particle size; wherein the screening condition is 60 mesh; the washing condition is: washing temperature 100 ℃, water washing time 6h; calcination conditions: calcination time 3h, calcination temperature 750℃.

[0035] Step (2): Add the calcined powder to the NaOH solution, heat and stir for a period of time, and then perform solid-liquid separation by filtration to obtain an aluminum alkali solution; wherein the NaOH solution has a concentration of 35wt%, a liquid-solid mass ratio of 6:1, and alkali-soluble Time 3.5h, alkali melting temperature 210℃.

[0036] Step (3): Add excess dilute hydrochloric acid to the aluminum alkali solution, observe the precipitation in the solution until the amount of precipitation does not change, and then perform solid-liquid separation by filtration to obtain AlCl 3 The filtrate; wherein the concentr...

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Abstract

The invention discloses a method for removing impurities from aluminum ash and belongs to the technical field of compound impurity removal and industrial waste recycling. The method comprises the following steps: grinding, sieving and water-washing the aluminum ash, roasting to obtain roasted powder, and performing alkali dissolution on the roasted powder by using a NaOH solution to obtain an aluminum alkali solution; adding the aluminum alkali solution into diluted hydrochloric acid until the precipitation capacity of the solution is not changed any more, and performing solid-liquid separation to obtain AlCl3 filtrate; and introducing ammonia water into the AlCl3 filtrate, and filtering to obtain aluminium hydroxide precipitate to finally fulfill the aim of removing impurities from the aluminum ash. According to the method, processes of waster washing, roasting, alkali solution, acid treatment and the like are adopted, the impurities can be effectively removed, pure aluminum hydroxide precipitate is obtained, and high-purity raw materials are provided for subsequent preparation of aluminum oxide and other aluminum-containing products, so that the aluminum ash is completely utilized, and the method has the advantages of wide raw material source, low environmental pollution, low material consumption and energy consumption, low cost and the like, and is suitable for industrialized production.

Description

Technical field [0001] The invention belongs to the technical field of compound impurity removal and industrial waste recycling, and particularly relates to a method for removing impurities from aluminum ash. Background technique [0002] my country is the country with the largest metal aluminum production in the world. In 2015 alone, the output of primary aluminum reached 31.41 million tons. Generally, 30-50Kg of aluminum ash is produced for every ton of aluminum produced, and its main components are metals (Al, Fe, Ca, Mg, etc.), alumina, silica, nitrides, carbides, etc., of which aluminum is the most content And alumina can reach 10 to 80%. With the continuous expansion of the production scale of aluminum and aluminum alloys in my country, the amount of aluminum ash and slag produced has also shown a trend of rapid growth. Aluminum ash contains nitrides, carbides, and fluorides, which are toxic and hazardous substances. It is listed in the "National Hazardous Waste List" by ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01F7/22
CPCC01F7/22
Inventor 衣雪梅刘雄章
Owner NORTHWEST A & F UNIV
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