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Process for removing impurities from lepidolite leaching solution

A technology of leaching solution and lepidolite, applied in the field of ore extraction of lithium, can solve the problems of high cost of impurity removal, low total recovery rate of lithium, low value of residual slag from impurity removal, etc., and achieves low cost of impurity removal, low concentration cost, The effect of less cleaning agent

Active Publication Date: 2011-02-16
江西海汇龙洲锂业有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Because these methods need a large amount of limestone, lime, sodium carbonate, sodium hydroxide and other alkaline substances to adjust the PH value, the cost of impurity removal is relatively high, and the total recovery rate of lithium is low, and the value of residual slag after impurity removal is low. Governance and other prominent issues

Method used

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  • Process for removing impurities from lepidolite leaching solution

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Comparison scheme
Effect test

Embodiment 1

[0038] A lepidolite leaching liquid impurity removal process is 2 times of forming alum and removing impurities, and 2 times of adjusting the pH value to remove impurities. The specific steps are:

[0039] 1) After the leaching solution is concentrated, it is cooled and crystallized into alum, and filtered to obtain the first alum and the first alum filtrate;

[0040] 2) Add additives to the first alum forming filtrate, continue to cool to form alum, or concentrate and then cool and crystallize to form alum. After the crystallization is completed, filter to obtain the second alum and the second alum forming filtrate respectively;

[0041] 3) The second alum-forming filtrate is added for the third time by adding a pH-adjusting impurity remover to remove magnesium, calcium, iron, and manganese ion impurities in the solution, and then filter to obtain the filtrate and precipitate, and the precipitate returns to the leaching step or abandoned;

[0042] 4) Add the filtrate in...

Embodiment 2

[0052] A lepidolite leaching liquid impurity removal process is 2 times of forming alum and removing impurities, and 2 times of adjusting the pH value to remove impurities. The specific steps are:

[0053] 1) After the leaching solution is concentrated, it is cooled and crystallized into alum, and filtered to obtain the first alum and the first alum filtrate;

[0054] 2) Add additives to the first alum forming filtrate, continue to cool to form alum, or concentrate and then cool and crystallize to form alum. After the crystallization is completed, filter to obtain the second alum and the second alum forming filtrate respectively;

[0055] 3) The second alum-forming filtrate is added for the third time by adding a pH-adjusting impurity remover to remove magnesium, calcium, iron, and manganese ion impurities in the solution, and then filter to obtain the filtrate and precipitate, and the precipitate returns to the leaching step or abandoned;

[0056] 4) Add the filtrate in step...

Embodiment 3

[0066] A lepidolite leaching liquid impurity removal process is 2 times of forming alum and removing impurities, and 2 times of adjusting the pH value to remove impurities. The specific steps are:

[0067] 1) After the leaching solution is concentrated, it is cooled and crystallized into alum, and filtered to obtain the first alum and the first alum filtrate;

[0068] 2) Add additives to the first alum forming filtrate, continue to cool to form alum, or concentrate and then cool and crystallize to form alum. After the crystallization is completed, filter to obtain the second alum and the second alum forming filtrate respectively;

[0069] 3) The second alum-forming filtrate is added with a pH regulator for the third impurity removal to remove magnesium, calcium, and iron ion impurities in the solution, and filtered to obtain the filtrate and precipitate, and the precipitate is returned to the leaching step or discarded;

[0070] 4) Add the filtrate in step 3) to the pH regulat...

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Abstract

The invention relates to a process for removing impurities from a lepidolite leaching solution. The process is completed by carrying out impurity removal on alumina twice and adjusting pH values for twice. Lithium salt precipitation products are obtained by adding additives to a lithium sulfate solution after impurity removal, and corresponding refined lithium salts can be prepared as required. The process has the advantages that the cost of impurity removal is low, by-products with high added values can be obtained, the extraction rate of lithium is high, various useful components of lepidolite ores can also be fully utilized when lithium salts are produced, and the recycling of resources is realized.

Description

technical field [0001] The invention belongs to the technical field of lithium extraction from ores, and more specifically relates to a process for removing impurities from lepidolite leachate. Background technique [0002] Lithium and lithium salts have been expanded from traditional application fields such as glass ceramics, electrolytic aluminum, grease, refrigeration, etc. to high-tech fields such as aluminum-lithium alloys, lithium batteries, nuclear fusion, etc., especially the explosive potential of new energy for high-efficiency batteries. The increase in demand poses an urgent challenge to the technological progress of the lithium salt industry. Research on new lithium mineral extraction technology is of great significance to the development of new energy sources in the world. [0003] At present, the main raw materials for extracting lithium are salt lake brine and solid lithium minerals. China has abundant reserves of lepidolite and spodumene. The impurity remo...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22B26/12C22B3/44C22B3/22
Inventor 旷戈林诚臧运凯李彦虎陈志斌兰方青王占前叶长燊
Owner 江西海汇龙洲锂业有限公司
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