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

AI Technical Summary

Problems solved by technology

This method carries out concentration and solid-liquid separation many times, the yield of lithium is low

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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Example Embodiment

[0071] Example 1

[0072] This embodiment provides a method for extraction-reverse extraction to separate and purify lithium, which includes the following steps:

[0073] (1) Mix TBP and LIX84 to form a composite extractant, control the volume ratio of TBP to LIX84 to 0.2:1, use sulfonated kerosene as a diluent, and add 20% volume percentage of composite extractant. As a phase modifier, dodecanol is extracted with a solution obtained by purifying high-priced metal ions with a lithium battery waste leachate with a lithium concentration of 0.5 g / L and a sodium concentration of 10 g / L under the condition of pH=10 to control the lithium battery waste The volume ratio of the solution obtained by purifying the high-valent metal ions from the leachate to the organic phase is 2.2:1, and then separated to obtain a loaded organic phase with a lithium concentration of 1g / L;

[0074] (2) Wash the loaded organic phase obtained in step (1) three times with water, and then perform gas-liquid-liqui...

Example Embodiment

[0076] Example 2

[0077] This embodiment provides a method for extraction-reverse extraction to separate and purify lithium, which includes the following steps:

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

[0079] (2) Wash the loaded organic phase obtained in step (1) three times with water, and then perform gas-liquid-liquid three-phase reverse extraction in a continuous countercurrent extraction tower. The extraction tower has three stages an...

Example Embodiment

[0081] Example 3

[0082] This embodiment provides a method for extraction-reverse extraction to separate and purify lithium, which includes the following steps:

[0083] (1) Mix Cyanex923 and LIX54 to form a composite extractant, control the volume ratio of Cyanex923 to LIX54 to 2:1, sulfonated kerosene as the diluent, and the volume percentage of composite extractant to 15%. Under the condition of pH=13, The concentration of salt lake brine is extracted with a lithium concentration of 5g / L, sodium concentration of 100g / L, potassium concentration of 50g / L, and boron concentration of 5g / L. The volume ratio of salt lake brine concentrated solution to organic phase is controlled to 0.2:1 , And then separated to obtain a loaded organic phase with a lithium concentration of 2.4 g / L;

[0084] (2) Wash the loaded organic phase obtained in step (1) 4 times with water, and then perform gas-liquid-liquid three-phase reverse extraction in a continuous countercurrent extraction tower. The extr...

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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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