Method for removing lithium, purifying and recovering lithium of aluminum electrolyte

An aluminum electrolyte, lithium recovery technology, applied in the improvement of process efficiency, lithium oxide;/hydroxide, lithium carbonate;/acid carbonate, etc., to achieve significant social benefits, promote technological progress, process Simple and easy effects

Active Publication Date: 2019-06-25
ZHENGZHOU JINGWEI TECH & IND
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

At present, domestic enterprises do not pay enough attention to this resource, and most enterprises store such

Method used

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  • Method for removing lithium, purifying and recovering lithium of aluminum electrolyte
  • Method for removing lithium, purifying and recovering lithium of aluminum electrolyte
  • Method for removing lithium, purifying and recovering lithium of aluminum electrolyte

Examples

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Embodiment 1

[0038] The method for delithiation, purification and lithium recovery of the aluminum electrolyte of this embodiment, the process flow is as follows figure 1 As shown, it specifically includes the following steps:

[0039] Step 1: Delithiation and purification of aluminum electrolyte

[0040] (1) The aluminum electrolyte containing lithium is ball milled and the main component of the aluminum electrolyte is cryolite Na 3 AlF 6 , calcium fluoride CaF 2 , lithium fluoride LiF, etc., wherein the content of lithium fluoride LiF is 6.5%, passing through a 50-200 mesh sieve;

[0041] (2) Weigh 30g of 100-mesh aluminum electrolyte containing 6.5% lithium fluoride LiF and slowly add it to 110mL of nitric acid with a concentration of 2.5mol / L, and stir at 70°C for 5h;

[0042] (3) Cool the mixed solution after the reaction to room temperature under natural conditions, filter and wash the filter residue several times until the pH value of the final washing liquid is 7, and obtain th...

Embodiment 2

[0049] The method for delithiation, purification and lithium recovery of the aluminum electrolyte of this embodiment, the process flow is as follows figure 1 As shown, it specifically includes the following steps:

[0050] Step 1: Delithiation and purification of aluminum electrolyte

[0051] (1) The aluminum electrolyte containing lithium is ball milled and the main component of the aluminum electrolyte is cryolite Na 3 AlF 6 , calcium fluoride CaF 2 , lithium fluoride LiF, etc., wherein the content of lithium fluoride LiF is 8.5%, passing through a 50-200 mesh sieve;

[0052] (2) Weigh 100g of 200-mesh aluminum electrolyte containing 8.5% lithium fluoride LiF and slowly add it to 1000mL of nitric acid with a concentration of 7mol / L, and stir at 115°C for 3h;

[0053] (3) After the reaction, the mixed solution was naturally cooled to room temperature, filtered, and the filter residue was washed several times until the pH of the final washing liquid was 7, and the primary ...

Embodiment 3

[0060] The method for delithiation, purification and lithium recovery of the aluminum electrolyte of this embodiment, the process flow is as follows figure 1 As shown, it specifically includes the following steps:

[0061] Step 1: Delithiation and purification of aluminum electrolyte

[0062] (1) The aluminum electrolyte containing lithium is ball-milled and crushed. The main component of the aluminum electrolyte is cryolite Na 3 AlF 6 , calcium fluoride CaF 2 , lithium fluoride LiF, etc., wherein the content of lithium fluoride LiF is 7.5%, passing through a 50-200 mesh sieve;

[0063] (2) Weigh 20g of 50-mesh aluminum electrolyte containing 7.5% lithium fluoride LiF and slowly add it to 400mL of nitric acid with a concentration of 12mol / L, and stir at 70°C for 9h;

[0064] (3) Cool the mixed liquid after the reaction to room temperature naturally, filter and wash the filter residue several times until the pH value of the final washing liquid is 7, and obtain the primary ...

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Abstract

The invention discloses a method for removing lithium, purifying and recovering lithium of an aluminum electrolyte. The method comprises the following steps: (1) removing lithium and purifying the aluminum electrolyte; and (2) recycling the removed lithium, namely, evaporating and concentrating filtrate, neutralizing, purifying, recovering lithium, and preparing lithium salt. The method aims at solving the problem of energy consumption increase due to enriched lithium in the electrolyte when an electrolytic bath is used for a long term in the aluminum industry. The aluminum electrolyte treatedby the method contains not greater than 0.5% of lithium; the aluminum electrolyte can be returned into the electrolytic bath for recycling; and the removed lithium can be recycled. With the adoptionof the method, a high value-added lithium salt product can be prepared; a new lithium resource is developed, and moreover, the demand condition of the current market on a high-level lithium product isreleased; the technology progress of the country in the new energy industry and the high-level lithium application industry is promoted; and the method is obvious in social benefit, wide in raw material source, low in comprehensive cost, simple and easy in processes, clean and environmentally friendly in production processes, and high in economic and social benefits.

Description

technical field [0001] The invention relates to the technical field of aluminum electrolytic smelting, in particular to a method for delithiation, purification and lithium recovery of an aluminum electrolyte. Background technique [0002] In recent years, with the rapid development of the electrolytic aluminum industry, the demand for alumina raw materials is increasing. Due to the different mineral sources and preparation processes, domestic alumina contains Li to varying degrees. 2 O. This kind of lithium-containing alumina raw material is added to the electrolytic cell, and the lithium salt is also introduced into the aluminum electrolytic cell together, and will continue to accumulate in the electrolyte. With the extension of the age of the electrolytic cell, lithium is gradually enriched, and the content of lithium fluoride can be as high as 6-10%. In the aluminum electrolyte system, when the lithium fluoride content is 2-3%, it can reduce the initial crystal temperat...

Claims

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Application Information

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IPC IPC(8): C25C3/18C22B7/00C22B26/12C01B7/19C01D9/04C01D15/02C01D15/08C01F11/22
CPCY02P10/20
Inventor 冯晓强于长军牛文军曹国法
Owner ZHENGZHOU JINGWEI TECH & IND
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