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A method for preparing aluminum fluoride-based fluoride salts from electrolyte-containing materials produced by aluminum electrolysis

An electrolyte and aluminum fluoride technology, which is applied in the direction of aluminum fluoride, aluminum halide, calcium/strontium/barium oxide/hydroxide, etc., can solve the problems of redundant electrolyte-containing materials, reduce fluoride emissions, and broaden the scope , the effect of protecting the environment

Active Publication Date: 2020-02-07
郑州于斯新创科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

But in this way, excess electrolyte-containing materials will be produced in terms of material balance, and for electrolytic aluminum enterprises, a large amount of surplus electrolyte-containing materials will be created

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] In this embodiment, the broken electrolyte extracted or scooped out from the electrolytic cell is processed, and the specific steps are as follows:

[0035] 1) Weigh the broken electrolyte extracted or scooped out from the 1000Kg electrolyzer;

[0036] 2) take by weighing 1340Kg solid aluminum chloride hexahydrate;

[0037] 3) Put 1000Kg electrolyte and 1340Kg solid aluminum chloride hexahydrate into the reactor after mixing, and add 2400Kg of water to dilute;

[0038] 4) Put the solid-liquid mixture (the fineness of the solid particles is 200 mesh and the pH value is 1.2) into the reactor, and heat the solid-liquid mixture while stirring. The stirring speed is 300r / min, and the reaction temperature is kept 90°C, reaction time 90 minutes;

[0039] 5) carry out solid-liquid separation to the reacted solid-liquid mixture by filtration;

[0040] 6) Carry out vacuum filtration and washing again to the 880Kg precipitate that solid-liquid separation obtains, wash water con...

Embodiment 2

[0045] In this embodiment, the regenerated electrolyte or regenerated cryolite obtained by treating the carbon slag by flotation or other methods is processed, and the specific steps are as follows:

[0046] 1) Weigh 1000Kg carbon slag through flotation or other methods to obtain regenerated electrolyte or regenerated cryolite;

[0047] 2) take by weighing 1260Kg solid aluminum chloride hexahydrate;

[0048] 3) After mixing 1000Kg electrolyte and 1260Kg solid aluminum chloride hexahydrate, put it into the reactor, and add water and step 6 in Example 1) to dilute a total of 2000Kg of the solution after removing impurities;

[0049] 4) Put the solid-liquid mixture (the fineness of the solid particles is 120 mesh and the pH value is 0.8) into the reactor, and heat the solid-liquid mixture while stirring. The stirring speed is 300r / min, and the reaction temperature is kept 90°C, reaction time 100 minutes;

[0050] 5) carry out solid-liquid separation to the reacted solid-liquid ...

Embodiment 3

[0056] In this embodiment, the electrolytic cell is stopped and the cleaning material is processed, and the specific steps are as follows:

[0057] 1) Take 500 grams of electrolyzer stop tank cleaning material;

[0058] 2) take by weighing 540 grams of solid aluminum chloride hexahydrate;

[0059] 3) Put 500 grams of electrolyte and 540 grams of solid aluminum chloride hexahydrate into the reactor after mixing, and add 1.2 liters of water to dilute;

[0060] 4) Then put the solid-liquid mixture (the fineness of the solid particles is 150 mesh and the pH value is 1.5) into the beaker, and put the beaker into the water bath to heat, while using electromagnetic stirring, the stirring speed is 150r / min, The reaction temperature is maintained at 100°C, and the reaction time is 80 minutes;

[0061] 5) Settling the reacted solid-liquid mixture and performing solid-liquid separation;

[0062] 6) 450 grams of sediment obtained by solid-liquid separation was washed with a filter and ...

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Abstract

The invention provides a method used for preparing a fluorine salt taking aluminium fluoride as a main component from electrolyte-containing material produced in aluminium electrolysis. The method comprises following steps: the electrolyte-containing material is mixed with a soluble aluminium salt or an aluminium salt solution, and reaction is carried out at 50 to 100 DEG C; a reaction product issubjected to solid liquid separation, after separation, an obtained solid product is washed and dried so as to obtain the fluorine salt taking aluminium fluoride as a main component, and a liquid solid product obtained through separation and a solid product washing solution obtained in washing of the solid product are mixed so as to obtain a mixture, a strong basicity hydroxide or a solution of the strong basicity hydroxide is added into the mixture to remove calcium and iron impurities in the mixture; evaporation concentration desalting is carried out, and separation is carried out so as to obtain a concentrated mother liquor; a carbonate or a solution of the carbonate is added to remove Lithium-ion impurities in the concentrated mother liquor, after impurity removing, an obtained solution is adopted in diluting or washing step in the method. The method is capable of converting the excess electrolyte-containing material produced in aluminium electrolysis into aluminum fluoride, so that effective circulation of fluoride element in aluminium electrolysis enterprises is realized, and great meaning on aluminium electrolysis industry development of China is achieved.

Description

technical field [0001] The invention relates to the technical field of circular economic utilization of aluminum-containing electrolyte materials and environmental protection, and relates to a method for preparing aluminum fluoride as a main component of fluorine salts from electrolyte-containing materials produced by aluminum electrolysis. Background technique [0002] In the past 20 years, my country's electrolytic aluminum industry has developed rapidly. By the end of 2018, the output of electrolytic aluminum had reached 36.425 million tons. It is the world's largest aluminum producer, accounting for about 55% of the world's primary aluminum production. Aluminum electrolyte is used as a solvent for alumina in aluminum electrolysis production, and it is not consumed in principle. In the production process of aluminum electrolysis, about 18-25Kg of aluminum fluoride needs to be added to maintain the stability of the electrolyte composition and temperature for each ton of pri...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01F7/50C01D15/08C01G49/02C01F11/02C01D3/04C25C3/18
CPCC01D3/04C01D15/08C01F7/50C01F11/02C01G49/02C01P2006/80C25C3/18
Inventor 周辉放洪托张春发
Owner 郑州于斯新创科技有限公司
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