Method for producing electrolyte for aluminium and recovering carbon through recycle of aluminum electrolysis carbon residue

A technology of electrolytic aluminum and electrolyte, which is applied in the field of waste resource recycling, can solve the problems of unutilized valuable elements, high environmental risks of landfill method, unqualified product quality of flotation method, etc., and achieve low harmful impurity content and high moisture content low effect

Active Publication Date: 2014-07-30
云南蓝天铝业环保科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

These methods have their own deficiencies, such as the landfill method has high environmental risks, valuable elements are not used, as a fuel is subject to supporting restrictions and valuable elements are not used, and the product quality of the flotation method is not up to standard, and it is impossible to achieve continuous scale production.

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  • Method for producing electrolyte for aluminium and recovering carbon through recycle of aluminum electrolysis carbon residue

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0037] Put 100Kg of electrolytic aluminum carbon slag into the jaw crusher for crushing, and then enter the ball mill to crush it through a 100-150 mesh sieve, magnetic separation to remove iron filings, add diesel 2.1Kg coal flotation GF oil 0.7Kg into the microbubble countercurrent flotation Column selection and separation to obtain 65Kg of underflow product and 35Kg of foam product. The underflow product is filtered by centrifugal and carbon is removed by an intermediate frequency furnace. The power of the intermediate frequency induction furnace is controlled at 350KW. The carbon removal time is about 8-10 minutes. The target aluminum is obtained by hammer crushing. Using 63.5Kg of electrolyte, the separated foam product was filtered and dried to obtain 34Kg of target carbon powder. The flue gas produced in the preparation process is first absorbed by the second spray absorption tower, and then discharged through the activated alumina absorption tower. The wastewater is recy...

Embodiment 2

[0040] Put 100Kg of raw material electrolytic aluminum carbon slag into the jaw crusher for crushing, then enter the ball mill to crush through 100~150 mesh screen, magnetic separation to remove iron filings, add diesel oil 2.2Kg coal flotation GF oil 0.8Kg into the microbubble countercurrent flotation Column selection and separation to obtain 62Kg of underflow product and 38Kg of foam product. After centrifugal filtration, the underflow product is used to remove carbon from an intermediate frequency furnace. The power of the intermediate frequency induction furnace is controlled at 350KW. The carbon removal time is about 8-10 minutes. The target aluminum is obtained by hammer crushing. Using 61Kg of electrolyte, the separated foam product was filtered and dried to obtain 37.5Kg of target carbon powder. The flue gas produced in the preparation process is first absorbed by the second spray absorption tower, and then discharged through the activated alumina absorption tower. The w...

Embodiment 3

[0043] Put 100Kg of electrolytic aluminum carbon slag into the jaw crusher for crushing, and then enter the ball mill to crush it through a 100-150 mesh sieve, magnetic separation to remove iron filings, add diesel 2.1Kg coal flotation GF oil 0.7Kg into the microbubble countercurrent flotation Column selection separation obtains 59Kg of underflow product and 41Kg of foam product. After centrifugal filtration, the underflow product is used to remove carbon with an intermediate frequency furnace. The power of the intermediate frequency induction furnace is controlled at 350KW. The carbon removal time is about 8-10 minutes. The target aluminum is obtained by hammer crushing. With 58Kg of electrolyte, the separated foam product is filtered and dried to obtain 40Kg of target carbon powder. The flue gas produced in the preparation process is first absorbed by the second spray absorption tower, and then discharged through the activated alumina absorption tower. The wastewater is recycl...

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Abstract

The invention discloses a method for producing an electrolyte for aluminium and recovering carbon through recycle of aluminum electrolysis carbon residue. The method comprises steps of pretreatment, flotation separation, preparation and post-treatment, and specifically comprises: crushing electrolysis waste old carbon material, removing scrap iron through magnetic separation, performing separation on the electrolysis waste old carbon material subjected to pretreatment to obtain a bottom flow product and a foam product; performing filtering, carbon-removing and crushing on the separated bottom-flow product to obtain a target electrolyte for aluminium; performing pressing filtration and drying on the separated foam product to obtain a target carbon powder; and recovering flue gas and wastewater generated during preparation, and discharging when flue gas and wastewater reach the standards. According to the method, waste materials badly needing processing are taken as the raw material, various resources are completely recycled, waste gas is completely recovered and subjected to purification processing, also the produced electrolyte for aluminium is low in water content and less in harmful impurities, and is an ideal raw material for aluminium electrolysis production, and the carbon powder obtained through flotation can be used as a dye during production of aluminium electrolysis bottom pastes or bottom carbon blocks or metallurgy production.

Description

Technical field [0001] The invention belongs to the technical field of recycling and utilization of waste resources, and particularly relates to a method for recycling electrolytic aluminum carbon slag to produce aluminum electrolyte and recovering carbon. Background technique [0002] At present, the domestic aluminum electrolytic carbon slag contains 50-65% electrolyte and about 20% fluorine, which is a hazardous waste, and its production is increasing with the increase in electrolytic aluminum production. Domestic aluminum plants mainly adopt treatment methods such as landfilling, supplementary fuel for alumina and cement production, fluorite substitutes for iron furnaces, and separation and recovery of carbon and impurities by flotation. These methods have their own shortcomings. For example, the landfill method has high environmental risks, valuable elements are not used, as fuels are restricted and valuable elements are not used, and the quality of flotation products is unq...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B09B3/00B09B5/00C25C3/06C01B32/05
Inventor 邹彪
Owner 云南蓝天铝业环保科技有限公司
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