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Recycling method of lithium-rich aluminum electrolyte

A technology of aluminum electrolyte and treatment method, which is applied in the field of recycling lithium-rich aluminum electrolytes and acidic lithium-rich aluminum electrolytes, and can solve the problems of increased energy consumption, low economic benefits, and low direct leaching efficiency of inorganic acids, etc. , to achieve the effect of reducing alkali consumption, high efficiency and promoting stable production

Active Publication Date: 2021-06-18
CENT SOUTH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In general, direct leaching with mineral acids is inefficient and usually requires pretreatment
In the leaching process, leaching at high temperature and inorganic acid will cause increased energy consumption, generate hydrogen fluoride gas to corrode equipment, and acid leaching at room temperature will produce hydrofluoric acid, which will also corrode equipment. The alkali neutralizes the inorganic acid, and the economic benefit is low

Method used

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  • Recycling method of lithium-rich aluminum electrolyte
  • Recycling method of lithium-rich aluminum electrolyte
  • Recycling method of lithium-rich aluminum electrolyte

Examples

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Effect test

Embodiment 1

[0043] A method for reclaiming lithium from an acidic lithium-rich potassium electrolyte, the method specifically comprising the following steps:

[0044] Step 1: crush 100 g of acidic lithium-rich aluminum electrolyte, heat-treat at 960° C. for 2 hours, make the material molecular ratio 3.6, and obtain product A. Cool to room temperature, and crush product A.

[0045] Step 2: Add the crushed product A to water to make a slurry, wherein the solid-to-liquid ratio is 1:15, add 40g of aluminum nitrate to a constant temperature magnetic stirrer at 50°C for leaching for 2 hours, and filter to obtain filtrate B and filter B.

[0046] Step 3: adding sodium hydroxide to the filtrate B to adjust the pH to 7, and filtering aluminum hydroxide after reacting for 10 minutes to obtain filtrate C.

[0047] Step 4: Add 15g of sodium carbonate to filtrate C, react for 20min, and filter to obtain 12.37g of lithium carbonate and filtrate D.

[0048] Step 5: The filtrate D is concentrated and enri...

Embodiment 2

[0050] A method for recovering lithium from an acidic lithium-rich aluminum electrolyte, the method specifically comprising the following steps:

[0051] Step 1: crush 100 g of the acidic lithium-rich aluminum electrolyte, conduct heat treatment at 960° C. for 2 hours, make the material molecular ratio 3.6, obtain product A, cool to room temperature, and crush product A.

[0052] Step 2: Add the broken roasted product A into water to make a slurry, wherein the solid-to-liquid ratio is 1:10, add 20g of sodium sulfate and 25g of aluminum sulfate octadecahydrate in a constant temperature magnetic stirrer at 50°C for leaching for 2 hours, and filter to obtain Filtrate B and filter residue B.

[0053] Step 3: Add sodium hydroxide to the filtrate B to adjust the pH to 7, filter the aluminum hydroxide after reacting for 10 minutes, and obtain the filtrate C.

[0054] Step 4: Add 17g of sodium carbonate to filtrate C, react for 20min, and filter to obtain filtrate D and 10.25g of lit...

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Abstract

The invention relates to a recycling treatment method of a lithium-rich aluminum electrolyte. Firstly, a product A is obtained by heat-treating the lithium-rich aluminum electrolyte to be treated; the roasted product A is leached in water by using a water-soluble inorganic salt as a leaching agent, and then filtered to obtain a filter residue B and filtrate B; add alkali or its aqueous solution in filtrate B, remove the aluminum ion in filtrate B, obtain filtrate C; add water-soluble carbonate or its aqueous solution in filtrate C, make the lithium ion in filtrate C convert into carbonic acid After lithium precipitation, filter to obtain lithium carbonate and filtrate D. The invention solves the technical problem that the high lithium-rich content in the excess aluminum electrolyte and the ineffective use of valuable metals currently plague the aluminum electrolysis industry, improves economic benefits, and promotes the stable production of electrolytic aluminum enterprises.

Description

technical field [0001] The invention relates to a recycling treatment method of a lithium-rich aluminum electrolyte, in particular to a recycling treatment method of an acidic lithium-rich aluminum electrolyte, and belongs to the technical field of metallurgical waste treatment. Background technique [0002] In recent years, some electrolytic aluminum enterprises in my country have faced high lithium impurities contained in alumina raw materials, which have continuously accumulated in the aluminum electrolyte, resulting in a corresponding substantial increase in the lithium content in the aluminum electrolyte. It is generally believed that the enrichment amount of lithium salt at 1~3wt% is beneficial to reduce the primary crystal temperature of the aluminum electrolyte, and the enrichment amount above 5wt% will affect the condition of the aluminum electrolytic cell to a certain extent, and the enrichment amount of lithium salt in some electrolytic aluminum enterprises Even r...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01D15/08C01D9/00C01D5/00C01F7/34C01F7/54C01F11/22
CPCC01D5/00C01D9/00C01D15/08C01F7/34C01F7/54C01F11/22C01P2002/72
Inventor 吕晓军韦茗仁韩泽勋孙启东王维维
Owner CENT SOUTH UNIV
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