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A method for comprehensive recycling of lithium-containing aluminum electrolyte

An electrolyte, lithium-aluminum technology, applied in the field of comprehensive recycling and utilization of lithium-aluminum electrolytes, can solve the problems of many accompanying impurity ions, difficult to high-end fields, unable to release production capacity, etc., to reduce production costs, product market competitiveness is strong, The effect of saving fluorite

Active Publication Date: 2017-07-14
DO FLUORIDE CHEM CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The current lithium compounds in my country mainly come from the extraction of lithium from salt lakes and ores. However, the lithium compounds prepared from salt lakes are difficult to use in high-end fields due to the large number of associated impurity ions and the limited purity. Restrictions, mining costs, and regional characteristics affect production capacity and cannot be released; how to reasonably develop and recycle existing lithium resources is an important topic that requires long-term research and development in the lithium-related industry in the future

Method used

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  • A method for comprehensive recycling of lithium-containing aluminum electrolyte
  • A method for comprehensive recycling of lithium-containing aluminum electrolyte
  • A method for comprehensive recycling of lithium-containing aluminum electrolyte

Examples

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Embodiment 1

[0030] The method for the comprehensive recycling of the lithium-containing aluminum electrolyte of this embodiment, the process flow is as follows figure 1 shown, including the following steps:

[0031] 1) Add 1000g of aluminum electrolyte containing 3wt% lithium fluoride and 85wt% cryolite and 3000g pure water into the reaction kettle and mix them; add 30wt% hydrochloric acid to adjust the pH of the system to 1, and stir and react at 10°C for 3h to obtain slurry;

[0032] 2) According to lithium fluoride: aluminum trichloride molar ratio 3:1, add 54g aluminum trichloride (purity is 95wt%) in the slurry obtained in step 1), heat up to 95 ℃ and react for 2h to convert lithium fluoride into Lithium chloride and aluminum fluoride are filtered, washed, and dried to obtain 878g of cryolite product; the washing water is neutralized with lime and discharged;

[0033] 3) add 63g sodium carbonate (purity is 98wt%) in step 2) gained filtrate by lithium chloride and sodium carbonate m...

Embodiment 2

[0036] The method for the comprehensive recycling of the lithium-containing aluminum electrolyte of this embodiment, the process flow is as follows figure 1 shown, including the following steps:

[0037] 1) Add 1000 g of aluminum electrolyte containing 10wt% lithium fluoride, 80wt% cryolite and 2000g pure water into the reaction kettle and mix; add 98wt% sulfuric acid to adjust the pH of the system to 0, and stir and react at 40°C for 2h to obtain slurry;

[0038]2) Add 231g of aluminum sulfate (purity: 95wt%) to the slurry obtained in step 1) according to the molar ratio of lithium fluoride: aluminum sulfate 6:1, heat up to 95°C for 3 hours to convert lithium fluoride into lithium sulfate and fluorine Aluminum, filtered, washed, and dried to obtain 900g of cryolite product; the washing water is neutralized with lime and discharged;

[0039] 3) add 205g sodium carbonate (purity is 98wt%) in step 2) gained filtrate by lithium sulfate and sodium carbonate mol ratio 1:1, carry ...

Embodiment 3

[0042] The method for the comprehensive recycling of the lithium-containing aluminum electrolyte of this embodiment, the process flow is as follows figure 1 shown, including the following steps:

[0043] 1) Add 1000g of aluminum electrolyte containing 15wt% lithium fluoride, 82wt% cryolite and 6000g pure water into the reaction kettle and mix them; add 98wt% nitric acid to adjust the pH of the system to 1.5, and stir and react at 45°C for 2h to obtain slurry;

[0044] 2) According to lithium fluoride: aluminum nitrate molar ratio 3:1, add 410g aluminum nitrate (purity is 98wt%) in the slurry obtained in step 1), heat up to 95 ℃ and react for 2.5h to convert lithium fluoride into lithium nitrate and Aluminum fluoride, filtered, washed, and dried to obtain 975g of cryolite product; the washing water was neutralized with lime and discharged;

[0045] 3) add 313g sodium carbonate (purity is 98wt%) in step 2) gained filtrate by lithium nitrate and sodium carbonate mol ratio 2:1, ...

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Abstract

The invention discloses a lithium-aluminum-contained electrolyte comprehensive recycling method, and belongs to the technical field of aluminum electrolysis preparation. The method comprises the following steps that firstly, a lithium-aluminum-contained electrolyte and water are mixed, inorganic acid is added to adjust pH of the system to be smaller than or equal to 2, and the stirring reaction is carried out to obtain slurry, wherein the lithium-aluminum-contained electrolyte comprises, by mass percentage, 1%-15% of lithium fluoride and 80%-90% of kryocide; and secondly, aluminum salt is added into the slurry obtained in the step one, the temperature rises to 75 DEG C to 95 DEG C for the reaction, filtering is carried out, and obtained crystals are kryocide. The method solves the technical problems which trouble the production of the electrolytic aluminum industry at present, the labor efficiency of electrolytic aluminum production is improved, the production cost is reduced, the service life of electrolytic aluminum equipment is prolonged, stable production of the electrolytic aluminum industry is promoted, and obtained product quality is superior to the national standard.

Description

technical field [0001] The invention belongs to the technical field of aluminum electrolysis preparation, and in particular relates to a method for comprehensive recycling of lithium-containing aluminum electrolytes. Background technique [0002] In recent years, electrolytic aluminum production enterprises generally face the problem that the lithium impurities contained in the alumina raw materials are relatively high, resulting in a correspondingly large increase in the lithium content in the electrolyte. The lithium fluoride content of existing enterprises has exceeded 3%, and the highest has reached 9% to 10%. The electrolyte system with high lithium salt content leads to low temperature of the electrolytic production tank, poor alumina dissolving ability, and many deposits at the bottom of the electrolytic tank, which makes the operation of the electrolytic process difficult, the stability of the aluminum electrolytic tank is poor, and the technical conditions are diffi...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22B7/00C22B26/12
CPCY02P10/20
Inventor 侯红军杨华春刘海霞李云峰薛旭金于贺华薛峰峰王建萍李霞叶文豪
Owner DO FLUORIDE CHEM CO LTD
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