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Method for recovering lithium from lithium-containing waste liquid

A technology for recovering lithium and waste liquid, which is applied in the field of lithium recovery from lithium-containing waste liquid, can solve problems such as increased cost, increased energy consumption, and reduced quality of lithium chloride, so as to improve recovery efficiency, reduce recovery cost, and reduce The effect of the impurity removal process

Active Publication Date: 2018-06-29
TIANQI LITHIUM CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] The present invention aims to solve the above-mentioned existing method for recovering lithium from lithium-containing waste liquid, the introduction of new impurities, resulting in increased cost, increased energy consumption, and reduced quality of recovered lithium chloride. A method for recovering lithium from lithium waste liquid, the impurity removal process of this method is simple and easy, no new impurities are introduced, and there are no repeated steps of impurity removal, which reduces the process flow and saves costs

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0041] A: Distillation

[0042] Take 100 L of waste liquid and carry out negative pressure distillation with a vacuum of 400 mbar. The end point of distillation is controlled at a volume ratio of distillate to mother liquor of 1:1, and the distillation is stopped to obtain about 50 L of distillation mother liquor.

[0043] B: Remove impurities

[0044] Adjust the pH of the distillation mother liquor obtained in A to 12 with about 10 mol / L NaOH solution, and add NaOH at the same time 2 CO 3 After stirring for 30 min, the solid-liquid separation was carried out; the resulting clear liquid was adjusted to pH 2.0 with industrial HCl, and boiled for 30 min; the pH was adjusted to 7.0 with saturated LiOH solution to obtain a purified solution; 0.01 times the volume of H 2 o 2(mass fraction 30%) and then stirred for 30 min to obtain a colorless purification solution.

[0045] C: evaporation

[0046] The clarified solution from B was evaporated to give crude LiCl.

[0047] D: D...

Embodiment 2

[0053] A: Distillation

[0054] Take 100 L of waste liquid and carry out negative pressure distillation at a distillation pressure of 1000 mbar. The end point of the distillation is controlled when the volume ratio of the distillate to the mother liquor is 4:1, and the distillation is stopped to obtain about 20 L of distillation mother liquor.

[0055] B: Remove impurities

[0056] Adjust the pH of the distilled mother liquor obtained in A to 12 with about 20 mol / L NaOH, and at the same time add lithium carbonate to stir for 30 minutes, then separate the solid from the liquid; adjust the pH of the obtained clear liquid to about 0.5 with industrial HCl, and boil for 60 minutes; Saturated LiOH solution adjusts pH to 6.0 to obtain purification solution; According to the volume of purification solution, add 0.5 times volume H thereto 2 o 2 (mass fraction 25%) and then stirred for 60 min to obtain a colorless purification solution.

[0057] C: evaporation

[0058] The clarified...

Embodiment 3

[0065] A: Distillation

[0066] Take 100 L of waste liquid and carry out negative pressure distillation with a vacuum of 200 mbar. The distillation end point is controlled at a volume ratio of distillate to mother liquor of about 1:4, and the distillation is stopped to obtain about 80 L of distillation mother liquor.

[0067] B: Remove impurities

[0068] Adjust the pH of the distilled mother liquor obtained in A to 12 with about 1 mol / L lithium hydroxide, and at the same time add potassium carbonate to stir for 50 minutes, then separate the solid from the liquid; adjust the pH of the obtained clear liquid to 0.5 with industrial HCl, and boil for 10 minutes; Adjust the pH to 9.0 with a saturated LiOH solution to obtain a purified solution; add 1.0 times the volume of H to it according to the volume of the purified solution 2 o 2 (mass fraction 50%) and then stirred for 45 min to obtain a colorless purified solution.

[0069] C: evaporation

[0070] The clarified solution ...

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Abstract

The invention discloses a method for recovering lithium from lithium-containing waste liquid. The method includes the steps of distillation, impurity removal, evaporation, absolute ethyl alcohol dissolution and spray drying. Through treatment with the process steps, the lithium in the lithium-containing waste liquid can be recovered in the form of lithium chloride. According to the method, the impurity removal process is simple and practical, no new impurities are introduced, the step of repeatedly removing impurities is avoided, the number of process procedures is reduced, and cost is saved.

Description

technical field [0001] The invention relates to a method for recovering lithium, in particular to a method for recovering lithium from lithium-containing waste liquid. Background technique [0002] Lithium, silver-white metal, element symbol Li, atomic number 3, atomic weight 6.941. Density 0.534 g / cm 3 , is the least dense metal. The melting point is 180°C and the boiling point is 1340°C. It turns yellow or black gradually in the air. It reacts violently with water to generate lithium hydroxide and hydrogen gas, reacts rapidly with dilute hydrochloric acid and dilute sulfuric acid to release hydrogen gas, reacts slowly with cold sulfuric acid, and reacts violently with nitric acid. It does not react with oxygen at room temperature, but reacts with nitrogen to form a protective lithium nitride layer. Lithium oxide is formed when heated above 100 °C, and can react with hydrogen when it is red hot. Under certain conditions, it can directly combine with halogen and sulfur...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22B26/12
CPCC22B26/12
Inventor 曹乃珍高洁陶帅徐川肇巍党春霞
Owner TIANQI LITHIUM CORP
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