Regeneration method of lithium extraction system

An extraction and system technology, which is applied in the field of lithium extraction system regeneration, can solve the problems of complicated lithium separation technology, and achieve the effect of simple regeneration method, guaranteed recycling and high regeneration efficiency

Inactive Publication Date: 2015-03-04
QINGHAI INST OF SALT LAKES OF CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The presence of high content of magnesium in brine makes the technology of separating lithium more complicated and becomes a key technical problem for lithium extraction from brine

Method used

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  • Regeneration method of lithium extraction system
  • Regeneration method of lithium extraction system
  • Regeneration method of lithium extraction system

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0041] First take 40mL of the empty organic phase HFeCl 4 ·nS; then with 4.00mol·L -1 The NaOH solution is the lye, the above empty organic phase HFeCl under different degrees of saponification 4 nS saponification, analysis of saponification phase separation effect under different degrees of saponification. After saponification, stand still and separate phases to obtain the extracted organic phases of each group under different degrees of saponification after regeneration.

[0042] In order to illustrate the effect of the above saponification regeneration, when the regenerated extraction organic phase is used for circular extraction, the Li in the aqueous phase is extracted + The concentration is 5g·L -1 , the extraction ratio is 5:1.

[0043] In this example, the above-mentioned empty organic phase HFeCl 4 nS comes from an extractant with a volume fraction of 80% TBP, FeCl 3 The extraction process is the co-extraction agent and 20% sulfonated kerosene is the diluent. A...

Embodiment 2

[0049] In the description of Embodiment 2, the similarities with Embodiment 1 will not be repeated here, and only the differences with Embodiment 1 will be described. The difference between Example 2 and Example 1 is that the empty organic phase HFeCl 4 nS comes from a 50% N by volume fraction, N-bis(2-ethylhexyl)acetamide as extractant, FeCl 3 The extraction process is the co-extraction agent and 50% sulfonated kerosene is the diluent. Among them, the extraction of Fe in the organic phase 3+ The concentration is 0.187mol L -1 ; After the extraction and stripping process, calculated by measurement, the empty organic phase HFeCl 4 · H in nS + The concentration is 0.176mol L -1 .

[0050] Get the empty organic phase HFeCl after the above stripping 4 nS 20mL, with 1.712mol L -1 The NaOH solution was used as lye for saponification, and the phase separation effect of saponification under different degrees of saponification was analyzed. After saponification, stand still an...

Embodiment 3

[0057] First take 20 mL of the empty organic phase HFeCl 4 ·nS; then with 4.00mol·L -1 The NaOH solution is the lye, the above empty organic phase HFeCl under different degrees of saponification 4 nS saponification, analysis of saponification phase separation effect under different degrees of saponification. After saponification, stand still and separate phases to obtain the extracted organic phases of each group under different degrees of saponification after regeneration.

[0058] In order to illustrate the effect of the above saponification regeneration, when the regenerated extraction organic phase is used for circular extraction, the Li in the aqueous phase is extracted + The concentration is 1.87g·L -1 , the extraction ratio is 2:1.

[0059] In this example, the above-mentioned empty organic phase HFeCl 4 nS comes from a 5% TBP / 45% N by volume fraction, N-di(2-ethylhexyl) acetamide as extractant, FeCl 3 The extraction process is the co-extraction agent and 50% sulf...

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Abstract

The invention discloses a regeneration method of a lithium extraction system. The lithium extraction system is regenerated by virtue of alkaline saponification and the regeneration method comprises the following steps of mixing empty-loading organic phases subjected to lithium extraction and reverse extraction and alkaline liquor, saponifying and standing for separating phases to obtain a clarified and transparent regenerated and extracted organic phase, wherein the empty-loading organic phases comprise an extractant, a synergistic extractant and a diluent which are involved in the lithium extraction and reverse extraction processes; the synergistic extractant is iron chloride; and the alkaline liquor is any one of sodium hydroxide solution and potassium hydroxide solution. The regeneration method of the lithium extraction system disclosed by the invention has the advantages of simplicity in operation and good saponifying effect; when lithium is extracted by virtue of the saponified, regenerated and recycled extraction organic phase, the extraction efficiency of lithium is high and the extraction effect is good; and by the method, the recycling of the extraction organic phase for extracting lithium is achieved and the process flows of extracting, carrying out reverse extraction, regenerating and extracting for circularly extracting lithium are completed.

Description

technical field [0001] The invention belongs to the fields of extraction chemistry and chemical industry, and in particular relates to a regeneration method for a lithium extraction system. Background technique [0002] Global lithium resources are mainly concentrated in a few countries such as Bolivia, China, Chile, Argentina, Australia, and the United States, and salt lake resources are the main resources. Therefore, extracting lithium from salt lake brine has become the top priority for countries competing for energy strategic heights. China is also one of the countries rich in lithium resources, with reserves accounting for about 10% of the world's total. The proven industrial reserves of lithium resources rank second in the world, second only to Bolivia. Among them, salt lake lithium resources accounted for more than 80%, mainly distributed in Qinghai and Tibet. The prospective reserves of lithium in the salt lake brine of Qinghai and Tibet alone are equivalent to the...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22B3/38C22B3/28C22B26/12
CPCY02P10/20
Inventor 时东李丽娟宋富根姬连敏彭小五聂峰刘志启曾忠民宋雪雪李慧芳
Owner QINGHAI INST OF SALT LAKES OF CHINESE ACAD OF SCI
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