Method for recycling and utilizing electrolytic aluminum fluorine-containing resources

A technology of electrolytic aluminum and resources, applied in the direction of aluminum fluoride, aluminum halide, etc., can solve problems such as environmental hazards and waste of valuable resources

Active Publication Date: 2019-03-08
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

At present, most of these waste materials are dumped, resulting in a waste of valuable resources, and because they contain fluorine, they are extremely harmful to the environment

Method used

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  • Method for recycling and utilizing electrolytic aluminum fluorine-containing resources
  • Method for recycling and utilizing electrolytic aluminum fluorine-containing resources
  • Method for recycling and utilizing electrolytic aluminum fluorine-containing resources

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] Get 200kg of high-molecular-ratio electrolytes pulled out from the electrolyzer. The analysis of electrolyte components is as shown in Table 1. Grind it into powder, add 400kg of water to make raw material slurry; prepare 400kg of leaching agent, the consumption is 40%. The ratio is 25% of aluminum sulfate, 5% of sodium sulfate, and the rest is water. The raw material slurry and the leaching agent were mixed and stirred in the reactor, heated to 86°C, and kept for 1.5h. After the reaction was completed, 35kg of the dissolved residue was obtained by filtration, and the filtrate was neutralized with NaOH to obtain 213kg of precipitate, which was roasted at 550°C to obtain 182kg The product, the component analysis of gained product is shown in Table 7.

[0023] Table 1 Analysis of the electrolyte components taken out of the electrolyzer

[0024] F

Embodiment 2

[0026] Take 500kg of carbon slag fished out from the electrolytic cell. The composition analysis of the carbon slag is shown in Table 2. Add the carbon slag to the wet mill, add 2t of water during the grinding process, and 600kg of leaching agent. The ratio of the leaching agent is aluminum nitrate 55%, sodium chloride 25%, aluminum chloride 20%, grind for 2 hours to make slurry 2.1t. Transfer the prepared slurry to the reaction kettle, heat it to 72°C, and keep it warm for 1 hour. After the reaction is completed, filter to obtain 115kg of dissolved residue. The filtrate is neutralized with NaOH to obtain 375kg of precipitate, which is roasted at 680°C to obtain 310kg of product , the composition analysis of the obtained product is shown in Table 7.

[0027] Table 2 Carbon slag composition analysis

[0028] F

Embodiment 3

[0030] Get the regenerated cryolite obtained by 300kg carbon slag flotation, the component analysis of the regenerated cryolite is shown in Table 3, this regenerated cryolite is added in the slurry tank, add water 1.6t, leaching agent 200kg, the ratio of leaching agent is Aluminum chloride 74%, aluminum sulfate 26%, made into slurry 2.1t. Transfer the prepared slurry to the reaction kettle, heat it to 94°C, and keep it warm for 3 hours. After the reaction is completed, filter to obtain 43kg of dissolved residue. The filtrate is neutralized with NaOH to obtain 308kg of precipitate, which is roasted at 660°C to obtain 278kg of product , the composition analysis of the obtained product is shown in Table 7.

[0031] Table 3 Composition analysis of cryolite regenerated by carbon slag flotation

[0032] F

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Abstract

The invention relates to the technical field of recycling and utilization of fluorine-containing resources in the electrolytic aluminum industry, in particular to a method for recycling and utilizingelectrolytic aluminum fluorine-containing resources. The method for recycling the electrolytic aluminum fluorine-containing resources comprises the step of leaching electrolytic aluminum fluorine-containing waste residues, and the step of leaching the electrolytic aluminum fluorine-containing waste residues is: mixing the electrolytic aluminum fluorine-containing waste residues with a leaching agent, and adding water to prepare a mixed reaction solution with a solid content of 3 to 60%, and performing leaching reaction on the mixed reaction solution at 10 to 150 DEG C to obtain a mixed leaching solution. The method for recycling and utilizing the electrolytic aluminum fluorine-containing resources, which is provided by the invention, mainly uses the leaching agent to leach fluorides in theelectrolytic aluminum fluorine-containing waste residues, and transfers valuable elements fluorine and aluminum in the electrolytic aluminum fluorine-containing waste residues to a liquid phase; thesum of the mass percentages of the fluorine element and the aluminum element in filtrate obtained by filtration is 1 to 50%. The method for recycling and utilizing the electrolytic aluminum fluorine-containing resources, which is provided by the invention, provides a possibility for further treatment to obtain fluorine-containing and aluminum-containing products.

Description

technical field [0001] The invention relates to the technical field of recycling fluorine-containing resources in the electrolytic aluminum industry, in particular to a method for recycling fluorine-containing resources in electrolytic aluminum. Background technique [0002] Cryolite, molecular formula Na 3 AlF 6 , can dissolve in alumina, is the most important auxiliary material in the electrolytic aluminum industry, and is mainly used as a flux for aluminum electrolysis. Starting a 300KA electrolytic cell requires about 40 tons of cryolite. The annual aluminum output of a single 300KA cell is 800 tons. According to China’s 2016 electrolytic aluminum production capacity of 31.87 million tons, the cryolite in use is about 1.9 million tons. Cryolite is based on the molecular ratio of sodium fluoride to aluminum fluoride (NaF / AlF 3 ), which can be divided into high molecular ratio cryolite and low molecular ratio cryolite. Most domestic electrolytic aluminum plants use low...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01F7/54C25C3/06
CPCC01F7/54C01P2006/10C01P2006/80C25C3/06
Inventor 陈湘清陈黎军唐剑邹春林李湘花彭助桂
Owner 湖南绿脉环保科技股份有限公司
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