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Comprehensive utilization method of aluminum ash

A treatment method and technology for aluminum ash, which are applied in the preparation of alkali metal aluminate/alumina/aluminum hydroxide, the preparation/separation of ammonia, and the preparation of ammonium salt, etc. , long process flow and other problems, to avoid atmospheric dust pollution, ensure environmental safety, and achieve the effect of huge economic benefits

Active Publication Date: 2016-02-24
湖南绿脉环保科技股份有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The problem of traditional aluminum ash utilization is that it mainly focuses on the recovery of metal aluminum, and resources such as alumina and salt are greatly wasted; there is a large pollution to the environment. First, the dust pollution is serious, resulting in particulate matter (PM10, PM2. 5) Pollution, the second is the pollution caused by the stacking of waste residues after the extraction of metal aluminum. The waste residues will slowly release ammonia gas when they see water, causing air pollution. The third is that the waste ash has unstabilized fluorine components, which are still hazardous wastes , causing groundwater pollution after contact with water
Among them, CN101973565A discloses a method for recycling aluminum in aluminum ash by low-temperature alkaline smelting, but does not consider the impact of ammonia release on the environment during the treatment process
CN1673084A discloses a method for producing alumina with waste aluminum ash, which has high sintering temperature, long process flow and complicated equipment
CN1927718A discloses a method for preparing sodium aluminate with waste aluminum ash, the dissolution rate of alumina in this method is low, and the loss of alumina is relatively large

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] A method for comprehensive utilization of aluminum ash, comprising the following steps:

[0027] Catalytic deamination step: take aluminum ash with a weight percentage content of less than 2% of metal aluminum, add water to the aluminum ash, form a paste under stirring, keep the water weight percentage in the paste at 5%, and add a catalyst Carry out catalytic decomposition and deamination, the catalyst used is sodium organic acid, and the catalyst dosage is 0.1% of the dry weight of aluminum ash. Ammonia gas absorption tower, adopts spray water to collect in the ammonia gas absorption tower, obtains ammonia water;

[0028] Forming step: add sodium hydroxide solution to the remaining paste after the catalytic deamination step, the weight of sodium hydroxide is 10% of the dry weight of aluminum ash, mix evenly, process and shape with a forming machine to obtain dispersed particles, dispersed particles The shape can be spherical, elliptical, cylindrical, cube, cuboid and...

Embodiment 2

[0032] A method for comprehensive utilization of aluminum ash, comprising the following steps:

[0033] The step of separating metal aluminum from aluminum ash: take the aluminum ash whose weight percentage of metal aluminum is greater than 2%, grind the aluminum ash, and sieve the aluminum ash. The flakes are collected, and the low-alumina aluminum ash enters the catalytic deamination step;

[0034] Catalytic deamination step: add water to the undersize low-aluminum aluminum ash, and form a paste under the action of stirring. The weight percentage of water in the paste is 50%, and then add a catalyst for catalytic decomposition and deamination. The catalyst used is It is sodium aluminate, the amount of catalyst used is 100% of the dry weight of aluminum ash, the temperature of catalytic decomposition and deamination reaction is 20°C, and the reaction time is 2h, and the ammonia gas generated by catalytic decomposition and deamination is collected in an ammonia gas absorption ...

Embodiment 3

[0039] A method for comprehensive utilization of aluminum ash, comprising the following steps:

[0040] The step of separating metal aluminum from aluminum ash: take the aluminum ash whose weight percentage of metal aluminum is greater than 2%, carry out wet grinding on the aluminum ash, and sieve. , the metal aluminum flakes are collected, and the low-aluminum aluminum ash enters the catalytic deamination step;

[0041] Catalytic deamination step: the undersieve low-aluminum aluminum ash slurry is precipitated and concentrated to form a paste. The weight percentage of water in the paste is 15%, and then a catalyst is added for catalytic decomposition and deamination. The catalyst used is sodium acetate The mixture with sodium aluminate, the amount of catalyst used is 3% of the dry weight of aluminum ash, the temperature of catalytic decomposition and deamination reaction is 50°C, the reaction time is 1h, and the ammonia gas generated by catalytic decomposition and deamination...

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Abstract

The invention belongs to the technical field of comprehensive utilization of waste resources from the aluminum industry and specifically discloses a comprehensive utilization method of aluminum ash. According to the comprehensive utilization method of aluminum ash, metallic aluminium is extracted from aluminum ash through an ore grinding method; the aluminum ash obtained after aluminium extraction undergoes catalytic deamination; the aluminum ash obtained after deamination is mixed with alkali and granulation forming is then carried out; and the granulation product is sintered and the sintered product is finally dissolved out. By the above method, useful components in the aluminum ash can be recovered to the maximum; ammonia gas which has been ignored for a long time is effectively recovered; components such as aluminium oxide, villiaumite and the like are recovered and utilized to the maximum; pollution of aluminum ash processing to the environment is avoided; atmospheric dust pollution is avoided; atmospheric pollution is also avoided due to ammonia gas recovery; pollution of aluminum ash stacking to underground water and soil is avoided due to extraction and recovery of fluoride salt; and environmental safety during the treating process is guaranteed.

Description

technical field [0001] The invention relates to the technical field of comprehensive utilization of waste resources in the aluminum industry, in particular to a comprehensive utilization treatment method for aluminum ash. Background technique [0002] Aluminum ash is an important solid waste in the aluminum industry with a huge amount. It is mainly derived from infusible inclusions, oxides, additives, and reaction products produced by physical and chemical reactions with additives floating on the surface of aluminum melt during the production process of smelting aluminum and aluminum alloys. It is produced in all production processes where aluminum is melted. process. The aluminum content of aluminum ash ranges from 10% to 80%, and the aluminum in it accounts for about 1% to 12% of the total loss in the process of aluminum production and use. [0003] Aluminum ash contains a large amount of alumina, metal aluminum and aluminum nitride with economic value. It is a renewable...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01C1/02C01C1/28C01F7/04C22B7/00C22B21/00
CPCY02A50/20
Inventor 陈湘清李花霞郑慧慧
Owner 湖南绿脉环保科技股份有限公司
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