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Technology for recycling potassium and sodium salts from lithium-precipitated liquid of lepidolite by means of ethanol

A technology of lepidolite and precipitation of lithium, applied in the field of potassium and sodium salt recovery, can solve the problems of high energy consumption, lithium loss, unsatisfactory sodium ion removal effect, etc., and achieve the effects of easy industrialization and low energy consumption

Pending Publication Date: 2020-03-27
CENT SOUTH UNIV +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

But the content of lithium in the lepidolite raw material is about 1.7%, but the content of potassium and sodium is as high as 6.5% and 1.25%. Because the solubility of potassium sodium salt in water is very high, these impurities will reduce the quality of lithium carbonate product on the one hand, and on the other hand Aspects will reduce production efficiency and even lead to production failure
Existing techniques for recovering potassium and sodium salts include freeze crystallization and evaporation concentration. Freeze crystallization can only initially remove potassium ions in the solution, but the removal effect on sodium ions is not ideal; and evaporation concentration will inevitably generate potassium and sodium Lithium double salt, resulting in a large loss of lithium, and low production efficiency and high energy consumption

Method used

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  • Technology for recycling potassium and sodium salts from lithium-precipitated liquid of lepidolite by means of ethanol
  • Technology for recycling potassium and sodium salts from lithium-precipitated liquid of lepidolite by means of ethanol

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] Proceed as follows:

[0025] After roasting, water immersion, purification, and precipitation of lithium carbonate, the lepidolite ore contains 80.7g / L of sodium, 28.9g / L of potassium, and 3.6g / L of lithium;

[0026] Take 10L of the above-mentioned lithium-precipitated liquid and import it into the settling tank, pump 1.5L of ethanol from the ethanol storage tank, mix evenly, cool naturally to 18°C, add 10g of finely ground potassium sulfate crystals, let stand for 30min, and filter to obtain crystal slurry I ;Pump 1.8L of ethanol into the above-mentioned filtrate, stir and mix quickly, let stand for 30min, and filter to obtain crystal slurry II and alcohol-water mixture;

[0027] Crystal slurry I and crystal slurry II are pumped into a centrifuge for separation, the centrifuge rotates at 1000r / min, and after centrifugation for 20 minutes, the crude potassium sulfate and potassium sulfate sodium salt are discharged from the solid phase outlet, and the supernatant is mer...

Embodiment 2

[0031] Proceed as follows:

[0032] After roasting, water immersion, purification, and precipitation of lithium carbonate, the lepidolite ore contains 78.6g / L sodium, 27.9g / L potassium, and 3.4g / L lithium;

[0033] Take 10L of the above lithium-precipitated liquid and introduce it into the settling tank, pump 1.5L of ethanol from the ethanol storage tank, mix well, cool naturally to 18°C, add 8g of finely ground potassium sulfate crystals, let it stand for 30min, and filter to obtain crystal slurry I ;Pump 2.0L of ethanol into the above filtrate, stir and mix quickly, let stand for 30min, filter to obtain crystal slurry II and alcohol-water mixture;

[0034] Crystal slurry I and crystal slurry II are pumped into a centrifuge for separation, and the centrifuge rotates at 1000r / min. After centrifugation for 25 minutes, the crude potassium sulfate and potassium sulfate sodium salt are discharged from the solid phase outlet, and the supernatant is merged into the lithium sink solu...

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Abstract

The invention relates to a technology for recycling potassium and sodium salts from lithium-precipitated liquid of lepidolite by means of ethanol, and belongs to the technical field of industrial water treatment. The technology comprises the technological steps of ore roasting, water leaching, purifying, lithium carbonate precipitating, lithium-precipitated mother liquid and ethanol mixing sedimentation, induced crystallization, centrifugal separation of crystal magma, MVR evaporation separation of ethanol-water mixed liquid and the like. According to the technology, classified recycling of the potassium and sodium salts and cyclic utilization of ethanol and water are achieved by adding ethanol with different volumes and potassium sulfate seed crystals according to the characteristics thatpotassium sulfate and potassium and sodium sulfate salts are supersaturated to be separated out and lithium sulfate is not separated out through the salting-out effect of ethanol, and the technologyhas the advantages of being low in energy consumption, environmentally friendly, efficient and easy to industrialize.

Description

technical field [0001] The invention relates to a process for recovering potassium and sodium salts from lepidolite liquid after lithium precipitation by using ethanol, and belongs to the technical field of industrial water treatment. Background technique [0002] With the increasingly prominent energy problems, the research and development and industrialization of new energy materials such as lithium-ion batteries are booming. my country has a large amount of lepidolite mineral resources, and the extraction of lithium, rubidium, cesium and other metals from lepidolite raw materials has a good development prospect. But the content of lithium in the lepidolite raw material is about 1.7%, but the content of potassium and sodium is as high as 6.5% and 1.25%, because potassium sodium salt is extremely high in water solubility, these impurity can reduce the quality of lithium carbonate product on the one hand, on the other hand On the one hand, it will reduce production efficien...

Claims

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Application Information

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IPC IPC(8): C22B7/00C22B26/10
CPCC22B7/006C22B26/10Y02P10/20
Inventor 王万林毛松周乐君张海辉张华龙路程薛利文张建康南进喜刘剑叶黄道远
Owner CENT SOUTH UNIV
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