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Potassium removal process of production system for lithium extraction from ore

A production system and ore technology, applied in the field of lithium salt production and hydrometallurgy, can solve the problems that the solubility of potassium aluminum sulfate is affected by temperature, the process of potassium removal is long, and the operation of potassium removal is difficult.

Active Publication Date: 2021-09-14
四川能投鼎盛锂业有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The object of the present invention is to provide a potassium removal process for the ore lithium extraction production system to solve the problem that the existing potassium removal process in lepidolite is long, and the solubility of the formed potassium aluminum sulfate is significantly affected by temperature, which makes the potassium removal operation difficult The problem

Method used

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  • Potassium removal process of production system for lithium extraction from ore
  • Potassium removal process of production system for lithium extraction from ore

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0049] Such as figure 1 Shown, a kind of ore extracts lithium production system potassium removal process, comprises the following steps:

[0050] Step 1, use 98wt% concentrated sulfuric acid to adjust the pH of lithium-containing potassium-containing mother liquor of the lithium carbonate production line to 3, in order to remove the carbonate group in the pre-neutralization liquid;

[0051] Step 2, using a lithium hydroxide production line to evaporate the potassium-rich mother liquor once to adjust the neutralization pre-liquid to 7 to obtain the neutralization post-liquid;

[0052] Step 3, after the neutralized liquid is evaporated to remove nitrate, a potassium-enriched sodium analysis mother liquor with a potassium content of 5g / L is generated, and the potassium-enriched sodium analysis mother liquor includes lithium sulfate, potassium sulfate, and sodium sulfate;

[0053] Step 4, using 98wt% concentrated sulfuric acid to adjust the pH of the potassium-rich and sodium-ri...

Embodiment 2

[0064] Such as figure 1 Shown, a kind of ore extracts lithium production system potassium removal process, comprises the following steps:

[0065] Step 1, use 98wt% concentrated sulfuric acid to adjust the pH of lithium carbonate production line lithium potassium-containing mother liquor to 2, in order to remove the carbonate group in the neutralization former liquor;

[0066] Step 2, using a lithium hydroxide production line to evaporate the potassium-rich mother liquor once to adjust the neutralization pre-liquid to 5 to obtain the neutralization post-liquid;

[0067] Step 3, after the neutralized liquid is evaporated to remove nitric acid, a potassium-enriched sodium analysis mother liquor with a potassium content of 1.8g / L is generated, and the potassium-enriched sodium analysis mother liquor includes lithium sulfate, potassium sulfate, and sodium sulfate;

[0068] Step 4, using 98wt% concentrated sulfuric acid to adjust the pH of the potassium-rich and sodium-rich mother...

Embodiment 3

[0079] Such as figure 1 Shown, a kind of ore extracts lithium production system potassium removal process, comprises the following steps:

[0080] Step 1, adjust the pH of lithium carbonate production line lithium potassium-containing mother liquor to 1 with 98wt% concentrated sulfuric acid, in order to remove the carbonate group in the pre-neutralization liquor;

[0081] Step 2, using a lithium hydroxide production line to evaporate the potassium-rich mother liquor once to adjust the pre-neutralization liquid to 6 to obtain the post-neutralization liquid;

[0082] Step 3, after the neutralized liquid is evaporated to remove the nitric acid, a potassium-rich sodium analysis mother liquor with a potassium content of 8.2g / L is generated, and the potassium-rich sodium analysis mother liquor includes lithium sulfate, potassium sulfate, and sodium sulfate;

[0083] Step 4, use 98wt% concentrated sulfuric acid to adjust the pH of the mother liquor rich in potassium and sodium analy...

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Abstract

The invention discloses a potassium removal process of a production system for lithium extraction from ore, belonging to the field of wet metallurgy. The invention particularly relates to the field of lithium salt production, and aims to solve the problems of long potassium removal process flow and high potassium removal operation difficulty in conventional removal of potassium in lepidolite. The potassium removal process comprises the following steps: conducting neutralization and nitrate removal through evaporation to generate potassium-rich sodium precipitation mother liquor; adding ferric salt into the potassium-rich sodium precipitation mother liquor with an adjusted pH value to obtain potassium-containing mother liquor; heating the potassium-containing mother liquor to 95 DEG C, and conducting stirring, reacting and crystallizing for 1-3 hours to obtain a suspension; and settling the suspension, carrying out solid-liquid separation, adjusting the pH value of a supernatant to 5-7 by using calcium carbonate, and removing iron. The process is short in process flow, convenient to control, simple in subsequent impurity removal, compatible with a sulfuric-acid-method lithium extraction process, simple in design and easy to implement.

Description

technical field [0001] The invention relates to a process for removing potassium in a production system for extracting lithium from ores. The invention belongs to the technical field of hydrometallurgy, and specifically relates to the technical field of lithium salt production. Background technique [0002] Spodumene has always been the main raw material for lithium extraction. It has a simple composition and high lithium content. Li 2 The theoretical content of O is 8.03%, but due to the replacement of sodium and potassium, usually Li 2 The O content ranges from 2.91% to 7.66% (Su Hui et al., Research Progress on the Extraction and Recovery of Lithium from Ore Resources. Acta Chemical Society, 2019, 70(1): 10-23.). In the production process of lithium carbonate and lithium hydroxide, the export of K impurities is less, so in the long-term production process, K is continuously enriched in the production mother liquor, which may easily cause product potassium pollution. Gen...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01D15/00C01D15/02C01D15/08C01D15/06C01G49/00
CPCC01D15/00C01D15/02C01D15/08C01G49/009C01D15/06C01P2006/80Y02P10/20
Inventor 严润华赵建平米茂龙何乘光林蔚婷
Owner 四川能投鼎盛锂业有限公司
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