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Method for recovering fluoride salt from complex aluminum electrolyte

An aluminum electrolyte and fluoride salt technology, applied in chemical instruments and methods, aluminum fluoride, aluminum compounds, etc., can solve the problems of high electrolyte recovery cost, environmental pollution, poor operation stability of aluminum electrolytic cells, etc.

Active Publication Date: 2022-04-12
NORTHEASTERN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Complicated aluminum electrolyte will lead to more difficult control of process technical conditions, and poor operation stability of aluminum electrolytic cell, which seriously affects the process technical indicators of aluminum electrolytic cell
Enterprises usually remove complex electrolytes with high impurity content from the electrolyte cycle, resulting in a large amount of complex aluminum electrolytes being piled up and discarded, which not only pollutes the environment, but also causes a serious waste of fluorine resources. Therefore, solving the problem of reusing waste complex aluminum electrolytes is beneficial to my country's aluminum industry. continuous development is very important
[0003] Patent CN112919507A discloses a method for extracting lithium salt in aluminum electrolyte by multiple acid-base combined leaching, which consumes a lot of alkali and acid, and the cost of electrolyte recovery is high; Direct leaching, the leaching efficiency is not high, and HF gas will be generated to corrode the equipment
High-temperature acid leaching will increase energy consumption. Before adding carbonate to precipitate lithium after acid leaching at room temperature, it needs to consume a large amount of alkali to neutralize inorganic acids, and the economic benefit is low.
In addition, there are still a large number of valuable elements that cannot be effectively recovered in the recycling process of the above method, resulting in waste of resources

Method used

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  • Method for recovering fluoride salt from complex aluminum electrolyte
  • Method for recovering fluoride salt from complex aluminum electrolyte
  • Method for recovering fluoride salt from complex aluminum electrolyte

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] S1: Mix the crushed complex aluminum electrolyte and aluminum sulfate evenly, and perform a roasting reaction to obtain roasted material A. The mass ratio of the complex aluminum electrolyte to aluminum sulfate is 1:0.5, the calcination temperature is 400°C, and the calcination time is 60min.

[0028] S2: pickling and washing the calcined material A obtained in step S1, the acid used for pickling is dilute sulfuric acid with a mass concentration of 5%; the washing process is carried out until the pH of the washing solution is 7. Then filter to obtain filtrate A and filter residue A.

[0029] S3: After the filter residue A is dried at 60°C, it is added to the alkali solution (sodium hydroxide solution with a mass percentage of 20%), the mass ratio of the dried filter residue to the alkali solution is 1:1.5, and it is dried in an oven at 40°C Alkali leaching in the medium, the alkali leaching time is 40min. Afterwards, filtrate B and filter residue B were obtained by fi...

Embodiment 2

[0032] Basically the same as Example 1, the difference is that the filtrate B produced in step S3 is also processed to prepare alumina:

[0033] S4: React the filtrate B in step S3 with an acid to obtain aluminum hydroxide, wherein the acid reacted with the filter residue B is a dilute sulfuric acid solution with pH=5, and the temperature for the reaction between the filtrate B and the acid is 40°C.

[0034] The obtained aluminum hydroxide is roasted at a temperature of 800° C. to further obtain alumina products.

Embodiment 3

[0036] Substantially the same as Example 1, the difference is that the filtrate A in S2 is also included in the recovery of Li:

[0037] S5: Add enough sodium carbonate to the filtrate A obtained in step S2 to heat and stir, and the heating temperature is 50°C. Filtrate C and filter residue C are obtained by filtration, and the main component of filter residue C is lithium carbonate, which can be used as a raw material for the production of high-purity lithium carbonate.

[0038] The filtrate C was evaporated and crystallized at 60°C to obtain sodium sulfate.

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Abstract

The invention belongs to the technical field of aluminum smelting solid waste recycling and reusing, and particularly relates to a method for recycling fluoride salt from complex aluminum electrolyte. According to the method for recovering the fluoride salt from the complex aluminum electrolyte, the complex aluminum electrolyte and the aluminum sulfate are used as raw materials, the processes of roasting, acid pickling dissolution, alkaline leaching, lithium removal, potassium removal, sodium removal and the like are sequentially carried out, a pure fluoride product (aluminum fluoride / sodium fluoride) is prepared, the whole process flow is simple and green, and the yield is high. According to the method, the fluorine element, the lithium element and the like in the complex aluminum electrolyte are recycled at the same time, HF is not generated, the resource utilization efficiency and economic benefits are improved, and stable production of electrolytic aluminum enterprises is promoted.

Description

technical field [0001] The invention belongs to the technical field of recovery and reuse of aluminum smelting solid waste, and in particular relates to a method for recovering fluoride salt from a complex aluminum electrolyte. Background technique [0002] In recent years, my country's electrolytic aluminum industry has developed rapidly, but currently electrolytic aluminum production enterprises generally face the problem of high impurities such as lithium and potassium contained in alumina raw materials. With the continuous operation of the electrolytic cell, the content of impurities such as lithium and potassium continues to Increase, this kind of electrolyte with high lithium and potassium content is called complex aluminum electrolyte. The complex aluminum electrolyte will lead to more difficult control of process technical conditions, and the poor operation stability of the aluminum electrolytic cell, which seriously affects the process technical indicators of the alu...

Claims

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Application Information

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IPC IPC(8): C01F7/50C01D3/02C01F7/54C01F7/441C01D15/08
Inventor 高炳亮赵丽楠王兆文石忠宁胡宪伟
Owner NORTHEASTERN UNIV
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