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Method for lithium extraction through extraction-reverse extraction, separation and purification

A technology for separation, purification and extraction of lithium, applied in the direction of improving process efficiency, can solve the problems of low lithium yield, large investment, long process flow, etc., and achieve the effects of high preparation cost, reduced operating cost, and reduced environmental pollution.

Active Publication Date: 2020-01-07
INST OF PROCESS ENG CHINESE ACAD OF SCI +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

This method carries out concentration and solid-liquid separation many times, the yield of lithium is low, the process flow is long, and the investment is large, which is not conducive to industrial application

Method used

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  • Method for lithium extraction through extraction-reverse extraction, separation and purification
  • Method for lithium extraction through extraction-reverse extraction, separation and purification
  • Method for lithium extraction through extraction-reverse extraction, separation and purification

Examples

Experimental program
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Embodiment 1

[0072] This embodiment provides a method for extracting-back-extracting, separating, purifying and extracting lithium, comprising the following steps:

[0073] (1) TBP and LIX84 are mixed to form a composite extractant, and the volume ratio of TBP and LIX84 is controlled to be 0.2:1, and sulfonated kerosene is used as a diluent, and the volume percentage of the composite extractant is 20%. Dodecyl alcohol is used as a phase modifier, and under the condition of pH=10, it is extracted with the solution obtained by purifying high-valent metal ions from the lithium battery waste leaching solution with a lithium concentration of 0.5g / L and a sodium concentration of 10g / L to control lithium battery waste. The volume ratio of the solution obtained by purifying high-valent metal ions by the leach solution to the organic phase is 2.2:1, and then separated to obtain a loaded organic phase with a lithium concentration of 1 g / L;

[0074] (2) The loaded organic phase that step (1) obtains ...

Embodiment 2

[0077] This embodiment provides a method for extracting-back-extracting, separating, purifying and extracting lithium, comprising the following steps:

[0078] (1) Mix TOPO and LIX860 to form a composite extractant, control the volume ratio of TOPO and LIX860 to 1:1, n-dodecane is the diluent, and the volume percentage of the composite extractant is 25%, under the condition of pH=12 Extract with lithium concentration of 2g / L, sodium concentration of 50g / L, potassium concentration of 25g / L and boron concentration of 10g / L lithium sinking mother liquor, control the volume ratio of lithium sinking mother liquor and organic phase to 1:1, Separation then, obtaining lithium concentration is the loaded organic phase of 2g / L;

[0079] (2) The loaded organic phase that step (1) obtains is washed 3 times, then carries out gas-liquid-liquid three-phase extraction in continuous countercurrent extraction tower, and the stage number of described extraction tower is 3 grades, uses SO 2 As t...

Embodiment 3

[0082] This embodiment provides a method for extracting-back-extracting, separating, purifying and extracting lithium, comprising the following steps:

[0083] (1) Cyanex923 and LIX54 are mixed to form a composite extractant, the volume ratio of Cyanex923 and LIX54 is controlled to be 2:1, sulfonated kerosene is a diluent, and the volume percentage of the composite extractant is 15%. The concentration of lithium is 5g / L, the concentration of sodium is 100g / L, the concentration of potassium is 50g / L and the concentration of boron is 5g / L salt lake brine concentrated solution is extracted, and the volume ratio of controlling the volume ratio of salt lake brine concentrated solution and organic phase is 0.2:1 , and then separated to obtain a loaded organic phase with a lithium concentration of 2.4g / L;

[0084] (2) The loaded organic phase that step (1) obtains is washed 4 times, then carries out gas-liquid-liquid three-phase extraction in continuous countercurrent extraction towe...

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Abstract

The invention relates to a method for lithium extraction through extraction-reverse extraction, separation and purification. The method comprises the following steps: (1) an extracting system containing a composite extracting agent is adopted to extract and separate lithium-contained solution under a condition of pH=10-13 to obtain a lithium-loaded organic phase; (2) the gas-liquid-liquid three-phase reverse extraction is performed on the lithium-loaded organic phase obtained in the step (1) to obtain lithium-loaded reverse extracting liquid; and (3) the reverse extracting liquid obtained in the step (2) is heated and separated to obtain a lithium product and separated mother liquor. The method realizes efficient separation of lithium from such impurity elements as Na, K and B by adoptingthe composite extracting agent, adopts the gas-liquid-liquid three-phase continuous reverse extraction to reach the reverse extracting rate of lithium is 90% above, the total yield is 83% or above andthe purity of the lithium product is 96% above, is high in treatment quantity, simple in process and equipment and low in investment, effectively utilizes industrial tail gas, and achieves energy conservation, environmental protection and continuous production.

Description

technical field [0001] The invention relates to the technical field of chemical separation, in particular to an extraction-back extraction, separation, purification, and lithium extraction method. Background technique [0002] Lithium is the metal with the smallest density and is widely used in electronics, chemistry, new energy and pharmaceuticals. Lithium resources mainly come from salt lakes, minerals and seawater. With the advancement of waste resources reuse in recent years, waste lithium batteries have also become important source. The process of extracting lithium from these raw materials requires multiple purification steps. In the classic process, evaporation and concentration, separation and removal of impurities, and deep removal of calcium and magnesium ions are used to obtain a high-purity lithium-containing solution, and then the lithium-containing solution is precipitated. Lithium carbonate product is obtained. [0003] CN108423696A discloses a method for ex...

Claims

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Application Information

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IPC IPC(8): C22B3/38C22B7/00C22B26/12
CPCC22B7/006C22B26/12C22B3/37Y02P10/20C22B3/32C22B3/30C22B3/382C22B3/3844C22B3/3846C22B3/40C22B3/04
Inventor 齐涛朱兆武张健林道勇
Owner INST OF PROCESS ENG CHINESE ACAD OF SCI
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