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Lithium-aluminum-contained electrolyte comprehensive recycling method

An electrolyte and 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, unreleased production capacity, and difficulty in high-end fields, so as to reduce production costs, reduce resource waste, and reduce product market. Competitive effect

Active Publication Date: 2016-02-24
DO FLUORIDE CHEM CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

This patented technology describes an improved way to produce high-strength pure cryolites without harmful impurities like chromic oxide or boron. By combining these materials into different forms during manufacturing, they become more valuable compared to traditional methods used alone due to their unique properties. These compositions have potential applications in various industries including batteries, electronics, lightweight structural components, medical devices, etc., making them highly useful tools for sustainable use.

Problems solved by technology

This patents discusses different methods used during manufacturing processes involving producing various types of metals such as magnesium (Mg). These techniques involve extracting excess metal values like calcium through ion exchange reactions, but these can cause issues related to decreased productivity, increased operating expenses, reduced quality of products made therefrom, difficulty in controlling the levels of residue components in the battery systems, and potential negative impacts upon economic performance and sustainability.

Method used

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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

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Claims

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Application Information

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Owner DO FLUORIDE CHEM CO LTD
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