Saponification-free process for extracting lithium

A non-saponifiable and extraction technology, applied in the direction of improving process efficiency, can solve problems such as destroying the extractant, and achieve the effects of reducing production cost, reducing acid consumption and prolonging service life

Inactive Publication Date: 2018-05-11
青海柴达木兴华锂盐有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] Aiming at the problem of excessive saponification and damage to the extractant in the saponification section of the existing process, the present invention provides a saponification-free process for extracting lithium. The process includes four major sections of extraction, washing, back-extraction and acid back

Method used

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  • Saponification-free process for extracting lithium
  • Saponification-free process for extracting lithium

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] Add 65 mL of LTBP and 35 mL of kerosene into a 250 mL separating funnel, mix well in the 250 mL separating funnel, add 100 mL of iron-on-iron brine for one extraction (iron on the organic phase, Fe: Li=1.5), let stand to separate the phases, Add 100 mL of brine without iron and boron removal to the organic phase for extraction, a total of 4 extractions (industrial production uses multi-stage countercurrent extraction). Take 6 M HCl and add it to the organic phase for stripping (industrial production uses multi-stage countercurrent stripping), and strip 3 times, 5 mL each time. The organic phase after stripping was washed once with 50 mL of workshop raffinate, and the washing solution was neutralized to pH=2 with magnesium hydroxide, and then washed once. Take 100 mL workshop boron extraction raffinate (without iron brine) for secondary extraction, and determine Li in the raffinate + Concentration, calculate the second extraction rate of 67.2%.

[0027] Under the same ...

Embodiment 2

[0029] Add 15 mL of N503, 35 mL of LTBP and 50 mL of kerosene into a 250 mL separating funnel, mix well in the 250 mL separating funnel, add 100 mL of iron brine for one extraction (iron on the organic phase, Fe: Li=1.3), let stand Separate the phases, add 100mL brine to the organic phase that has not been treated with iron and boron for extraction, and extract a total of 3 times (industrial production uses multi-stage countercurrent extraction). Use workshop stripping solution (Li + 38.5g / L,H +0.551 g / L) and washed 3 times, 3 mL each time (industrial production uses multi-stage countercurrent washing). Take 7 M HCl and add it to the organic phase for back extraction, back extraction 3 times, 5 mL each time (industrial production uses multi-stage countercurrent back extraction); the organic phase after back extraction is washed twice with workshop raffinate, 25 mL each time , after the second washing, neutralize it with magnesium oxide to pH = 1, then introduce it into the s...

Embodiment 3

[0031] Add 40 mLDIBK, 10 mLTBP and 50 mL kerosene into a 250 mL separating funnel, mix well in the 250 mL separating funnel, add 100 mL iron brine for one extraction (iron on the organic phase, Fe: Li=1.3), let stand Separate the phases, add 100mL brine to the organic phase that has not been treated with iron and boron for extraction, and extract a total of 3 times (industrial production uses multi-stage countercurrent extraction). Take 5 M HCl and add it to the organic phase for back extraction, back extraction 3 times, 5 mL each time (industrial production uses multi-stage countercurrent back extraction); the organic phase after back extraction is washed once with workshop raffinate, 20 mL, The washed solution is neutralized with slaked lime to pH = 1, and then introduced into the system for the second washing. After the second washing, the solution is neutralized with slaked lime to pH = 1, and then introduced into the system for the third wash (Industrial production uses m...

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Abstract

The invention discloses a saponification-free process for extracting lithium. The saponification-free process comprises four large sections of extraction, washing, back extraction and acid pickling, wherein the extraction is carried out for 2-10 stages, the washing is carried out for 0-20 stages, back extraction is carried out for 2-10 stages and the acid washing is carried out for 2-10 stages; and brine is the refined brine after the boron is extracted, the brine is used for adjusting the acidity before feeding, the pH value of a control system is 0-2, the extraction temperature is 25-50 DEGC, and an obtained reverse extraction liquid is subjected to oil removal, evaporation, cooling crystallization, filtering and drying to obtain a high-purity anhydrous lithium chloride product. According to the saponification-free process for extracting the lithium developed for the first time, the service life of an extraction agent is greatly prolonged, use of sodium hydroxide with relatively expensive price can be avoided, meanwhile, acid consumption is reduced, and production cost is reduced; and after saponification is removed, the whole process is easier to control and operate, continuousproduction can be realized, and the method has certain potential industrial production values.

Description

technical field [0001] The invention relates to a saponification-free method for extracting lithium from salt lake brine, which belongs to the field of extraction chemical industry. Background technique [0002] As a new type of strategic energy, lithium is mainly used in new energy batteries, nuclear power generation, aerospace, medicine and other fields. Lithium resources exist in the form of solid ore and salt lake brine. In terms of production costs, lithium extraction from salt lakes has an absolute advantage. my country's salt lakes are rich in lithium resources, especially in the Qaidam Basin in Qinghai, with reserves of 24.47 million tons (calculated as LiCl). [0003] The extraction method is one of the most promising methods for extracting lithium from brine. The extraction agents mainly include amide extractants, neutral phosphine extractants, ketone extractants, alcohol extractants, and crown ethers. In 1979, the Qinghai Salt Lake Institute of the Chinese Acade...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22B26/12C22B3/26
CPCC22B26/12C22B3/26Y02P10/20
Inventor 孟庆芬赵朋龙陈颖林庞全世
Owner 青海柴达木兴华锂盐有限公司
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