Process of producing alumina with waste aluminium ash

A technology of alumina and waste aluminum ash, applied in the direction of alumina/hydroxide, solid waste removal, etc., can solve environmental pollution, social environmental pollution has not been reduced, and the use of waste aluminum ash has not found a better way out and other issues, to achieve the effect of low production cost and simple process flow

Inactive Publication Date: 2005-09-28
潘坤涛 +1
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  • Abstract
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Problems solved by technology

For a long time, aluminum ash has been discharged everywhere as industrial waste, causing pollution to the environment
In order to reduce the pollution of aluminum ash to the local environment, in recent years, the places where aluminum ash is disc

Method used

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  • Process of producing alumina with waste aluminium ash

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Experimental program
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Embodiment Construction

[0025] refer to figure 1 , the production process flow of the embodiment of the present invention is:

[0026] (1) Raw material screening to remove impurities: screen raw aluminum ash with a screen mesh of 60 mesh, add water and centrifuge washing liquid to remove various impurities through multi-stage vibrating screens, and obtain relatively pure aluminum ash;

[0027] (2) Magnetic separation: the screened aluminum ash is removed by a water magnetic separator, the magnetic force is not strictly required, and it is adjusted to be able to absorb iron powder; the water is discharged to recycle the iron powder;

[0028] (3) Dehydration of raw materials: After magnetic separation, the aluminum ash with water is dehydrated by a centrifuge until the water content is generally <15%, and then dehydrated and discharged;

[0029] (4), batching stirring: 31% of the dehydrated aluminum ash enters the batching tank, and adds 31% Na 2 CO 3 and 38% water or add 31% Na 2 CO 3 and a conce...

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Abstract

The process of producing alumina with waste aluminum ash includes the following steps: sieving waste aluminum ash in 40-60 mesh; eliminating iron magnetically; dewatering to water content lower than 15 %; adding Na2CO3 solution via stirring to obtain chamotte; sintering aluminum ash slurry at 1100-1200 deg.c; cooling to 100-200 deg.c; adding water and grinding to obtain chamotte slurry of 120-150 mesh with sodium aluminate content of 120-150 g/L; heating to leach out sodium aluminiate at 80-100 deg.c for 1-2 hr; pressure filtering to obtain concentrated sodium aluminiate solution; introducing CO2 gas to separate crystal at 50-70 deg.c; solid-liquid separation in centrifuge to obtain aluminum hydroxide crystal; and roasting at 1100-1200 deg.c to obtain alumina product.

Description

technical field [0001] The invention belongs to a method for producing alumina by using waste aluminum ash. Background technique [0002] Dali Town, Nanhai, Guangdong Province is the place where the production of aluminum profiles is most concentrated in my country, known as the "Hometown of Aluminum Profiles". Because in the production process of aluminum profiles, an industrial waste residue - aluminum ash will be produced. Discharged in Dali Town and its surrounding areas, the amount of this waste aluminum ash formed is tens of thousands of tons every year. For a long time, aluminum ash has been discharged everywhere as industrial waste, causing pollution to the environment. In order to reduce the pollution of aluminum ash to the local environment, in recent years, the places where aluminum ash is discharged have gradually moved to remote mountainous areas with few people, but the pollution to the social environment has not been reduced. As far as we know, so far, peop...

Claims

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Application Information

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IPC IPC(8): B09B3/00C01F7/02
Inventor 潘炯涛谭光明
Owner 潘坤涛
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