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A kind of extraction method of lithium in electrolytic aluminum waste slag

A technology of electrolytic aluminum waste residue and extraction method, applied in the field of lithium extraction, can solve the problems of increasing the use of carbon dioxide, increasing the cost of equipment input, reducing the extraction rate of lithium carbonate, etc., to reduce pollution, reduce investment in production equipment, and low cost of raw materials Effect

Active Publication Date: 2021-03-02
台州闪能科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

But this method has too many extraction steps, and uses sodium carbonate first, then uses lime, causes in feed liquid needs to add a large amount of sodium carbonate, and sodium ion concentration is too high, and solution can't be effectively concentrated, has reduced the extraction rate of lithium carbonate
At the same time, the use of carbon dioxide is increased, and high-pressure reaction equipment is required, which increases equipment input costs and raw material costs
The causticization reaction produces a large amount of lye, which brings trouble to the subsequent waste liquid treatment
And do not see at present, adopt fewer extraction steps, milder reaction conditions, and the report of the lithium extraction method of cheaper raw material

Method used

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  • A kind of extraction method of lithium in electrolytic aluminum waste slag

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Effect test

Embodiment 1

[0039]A method for extracting lithium from electrolytic aluminum waste residue, the steps are as follows:

[0040]50kg of electrolytic aluminum waste residue from which carbon and iron have been removed is reacted with 100kg of concentrated sulfuric acid at a reaction temperature of 250°C. After 6 hours of reaction, mixture A is obtained. At the same time, water is used to absorb the HF produced by the reaction. The resulting HF aqueous solution can be used to prepare cryolite ;

[0041]Dissolve mixture A with 500 kg of water and filter to obtain filtrate B. Slowly add calcium oxide to filtrate B until the pH of the solution reaches 7.5. Filter the resulting solution to obtain filter residue C and filtrate D. The main component of filter residue C is hydroxide Aluminum and calcium sulfate, aluminum hydroxide can be used to prepare by-products such as cryolite, and calcium sulfate can be used to prepare by-products such as gypsum powder.

[0042]The filtrate D was heated to 90°C and concentra...

Embodiment 2

[0046]A method for extracting lithium from electrolytic aluminum waste residue, the steps are as follows:

[0047]50kg of electrolytic aluminum waste residue from which carbon and iron have been removed is reacted with 125kg of concentrated sulfuric acid at a reaction temperature of 100°C. After 20 hours of reaction, mixture A is obtained. At the same time, water is used to absorb the HF produced by the reaction. The resulting HF aqueous solution can be used to prepare cryolite ;

[0048]Dissolve mixture A with 500 kg of water and filter to obtain filtrate B. Slowly add calcium oxide to filtrate B until the pH value of the solution reaches 7. Filter the resulting solution to obtain filter residue C and filtrate D. The main component of filter residue C is hydroxide Aluminum and calcium sulfate, aluminum hydroxide can be used to prepare by-products such as cryolite, and calcium sulfate can be used to prepare by-products such as gypsum powder.

[0049]The filtrate D was heated to 60°C by evapo...

Embodiment 3

[0052]A method for extracting lithium from electrolytic aluminum waste residue, the steps are as follows:

[0053]50kg of electrolytic aluminum waste residue from which carbon and iron have been removed is reacted with 75kg of concentrated sulfuric acid at a reaction temperature of 300°C. After 6 hours of reaction, mixture A is obtained. At the same time, water is used to absorb the HF produced by the reaction. The resulting HF aqueous solution can be used to prepare cryolite ;

[0054]Dissolve mixture A with 500kg of water and filter to obtain filtrate B. Slowly add calcium oxide to filtrate B until the pH of the solution reaches 7.5. Filter the resulting solution to obtain filter residue C and filtrate D. The main component of filter residue C is hydroxide Aluminum and calcium sulfate, aluminum hydroxide can be used to prepare by-products such as cryolite, and calcium sulfate can be used to prepare by-products such as gypsum powder.

[0055]The filtrate D was heated to 99°C to be concentra...

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Abstract

The invention discloses a method for extracting lithium from electrolytic aluminum waste slag, which comprises the following steps: (1) reacting electrolytic aluminum waste slag with concentrated sulfuric acid to obtain mixture A; (2) adding water to dissolve mixture A and filtering to obtain filtrate B , calcium oxide is slowly added to the filtrate B, and the resulting solution is filtered to obtain the filter residue C and the filtrate D; (3) the filtrate D is heated and evaporated to concentrate, and the filtered filtrate is further evaporated and concentrated to obtain the filtrate E, and the filtrate E is maintained in a heated state; ( 4) Saturate the sodium carbonate solution in the filtrate E to obtain the suspension F, filter the suspension F to obtain a filter cake, wash and dry the filter cake to obtain the lithium carbonate product. The method adopts the waste slag of the electrolytic aluminum industry as a raw material, and the source of the raw material is wide, the cost is lower than that of the lithium ore raw material, the extraction is easy, the yield is high, the other raw materials used in the extraction method are cheap and the cost is low, and the obtained by-products can also be recycled.

Description

Technical field[0001]The invention relates to the technical field of lithium extraction, in particular to a method for extracting lithium from electrolytic aluminum waste residue.Background technique[0002]my country is a country rich in lithium resources, but there have always been certain difficulties in the development and utilization of lithium resources, including the difficulty of extracting lithium resources, the low extraction ratio, and the problems that some lithium resources have not been utilized. With the development of the new energy field, the demand for lithium-ion batteries has increased rapidly, which has led to a rapid increase in the price of lithium raw materials.[0003]At present, the extraction of lithium raw materials in my country is mainly through lithium ore extraction and brine extraction. In northern China, a certain amount of lithium is associated with aluminum ore resources. In the electrolytic aluminum industry, lithium fluoride is also added as an auxi...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01D15/08C01B7/19C01F11/46C01F7/34C01D5/06
CPCC01B7/191C01D5/06C01D15/08C01F7/34C01F11/46
Inventor 陈振宇曹毅陈垒陈志山倪孟杰张建
Owner 台州闪能科技有限公司
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