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Method of extracting lithium from electrolytic aluminium waste residues

A technology for electrolytic aluminum waste residue and filter residue, which is used in the removal of solid waste, lithium carbonate;/acid carbonate, reagents, etc., can solve the problem of high fluorine content, achieve simple process, reduce production cost, and be environmentally friendly. Benefit and Economic Benefit Significant effect

Active Publication Date: 2016-02-03
焦作多氟多实业集团有限公司
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

According to the characteristics of high fluorine content in electrolytic aluminum waste slag, the above-mentioned prior art uses electrolytic aluminum waste slag and concentrated sulfuric acid as raw materials to prepare cryolite, so that the resources in electrolytic aluminum waste slag can be recovered to a certain extent. Extraction not yet reported in the literature

Method used

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  • Method of extracting lithium from electrolytic aluminium waste residues
  • Method of extracting lithium from electrolytic aluminium waste residues
  • Method of extracting lithium from electrolytic aluminium waste residues

Examples

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Effect test

Embodiment 1

[0041] The method for extracting lithium from electrolytic aluminum waste slag of the present embodiment, such as figure 1 shown, including the following steps:

[0042] 1) Water mill the lithium-containing electrolytic aluminum waste slag to below 200 mesh, remove carbon and iron in the waste slag, and obtain a pretreated waste slag (main component content F: 45%, Al: 15%, Na: 23%, Li: 1 %);

[0043] Take 23.80 kg of pretreated waste residue, add concentrated sulfuric acid with a mass concentration of 98% according to the mass ratio of pretreated waste residue to concentrated sulfuric acid of 1:1, and react at 200° C. for 12 hours to obtain mixture A;

[0044] The HF gas generated during the reaction is condensed by a condenser, absorbed by water to a HF solution with a concentration of 40%, and used for the subsequent reaction of preparing cryolite;

[0045] 2) Take the mixture A obtained in step 1), and extract it with 47.60kg of water (the quality of adding water is twic...

Embodiment 2

[0054] The method for extracting lithium from electrolytic aluminum waste slag of the present embodiment, such as figure 1 shown, including the following steps:

[0055] 1) Dry-grind lithium-containing electrolytic aluminum waste slag to below 200 mesh, remove carbon and iron in the waste slag, and obtain pretreated waste slag (main component content F: 48%, Al: 14%, Na: 22%, Li: 2%);

[0056] Take 12.05 kg of pretreatment waste residue, add concentrated sulfuric acid with a mass concentration of 98% according to the mass ratio of pretreatment waste residue to concentrated sulfuric acid as 1:2, and react at 300°C for 10 hours to obtain mixture A;

[0057] The HF gas generated during the reaction is condensed by a condenser, absorbed by water to a HF solution with a concentration of 40%, and used for the subsequent reaction of preparing cryolite;

[0058] 2) Take the mixture A obtained in step 1), and extract it with 24.10 kg of water (the quality of adding water is twice the...

Embodiment 3

[0067] The method for extracting lithium from electrolytic aluminum waste slag of the present embodiment, such as figure 1 shown, including the following steps:

[0068] 1) Dry-grind lithium-containing electrolytic aluminum waste slag to below 200 mesh, remove carbon and iron in the waste slag, and obtain pretreated waste slag (main component content F: 40%, Al: 18%, Na: 26%, Li: 1.5%);

[0069] Take 15.62 kg of pretreated waste residue, add concentrated sulfuric acid with a mass concentration of 98% according to the mass ratio of pretreated waste residue to concentrated sulfuric acid of 1:2, and react at 400° C. for 5 hours to obtain mixture A;

[0070] The HF gas generated during the reaction is condensed by a condenser, absorbed by water to a HF solution with a concentration of 40%, and used for the subsequent reaction of preparing cryolite;

[0071] 2) Take the mixture A obtained in step 1), and extract it with 31.25kg of water (the quality of adding water is twice the m...

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Abstract

The invention discloses a method of extracting lithium from electrolytic aluminium waste residues. The method comprises the following steps of performing a reaction on the electrolytic aluminium waste residues containing the lithium and concentrated sulfuric acid under the condition of 200 to 400 DEG C, and a mixture A is obtained; adding water into the mixture A, filtering after leaching to obtain filtrate A and a filter residue A; adding the filtrate A into sodium carbonate, and performing an alkaline hydrolysis reaction under the condition of 20 to 40 DEG C, then filtering to obtain filtrate B and a filter residue B; adding water into the filter residue B to prepare slurry, then adding lime into the slurry for a causticizing reaction, then filtering to obtain filtrate C and a filter residue C; feeding CO2 into the filtrate C in step 4) for a carbonization reaction, then filtering, washing, drying so as to obtain the lithium. The content of impurity ions in the obtained cell grade lithium carbonate is low, the quality of a product is excellent, and the problems of low yield, high production cost, weak market competitiveness when the lithium is extracted from ore to prepare the cell grade lithium carbonate at present are solved; a new process that a high value-added and high quality lithium product is produced by low-grade lithium resources is developed, the process is simple, the industrialized operation is liable to be realized, and the economic and social benefit is remarkable.

Description

technical field [0001] The invention belongs to the technical field of electrolytic aluminum waste slag treatment, and in particular relates to a method for extracting lithium from electrolytic aluminum waste slag. Background technique [0002] Although my country's lithium resource reserves are abundant, the degree of development is not high, and the output only accounts for about 5% of the global total output. As new energy vehicles enter the golden development period and the price of lithium carbonate rises, many enterprises in my country try hard to industrialize ore lithium and salt lake lithium, but affected by resources, technology, mining conditions and economics, the industrialization process of lithium carbonate slower. Lithium carbonate, as the center of the lithium industry chain, has a vital position. Global lithium companies measure their size by the output of lithium carbonate. According to the existing resource sources, the current production of lithium carb...

Claims

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Application Information

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IPC IPC(8): C01D15/08B09B3/00
CPCY02P20/141
Inventor 于贺华温丰源王建萍薛峰峰郭琬马广辉耿梦湍张良王宗凯王艳君
Owner 焦作多氟多实业集团有限公司
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