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A composite extraction system and extraction method for extracting lithium from lithium-containing brine

A technology for extracting lithium and brine, which is applied in the fields of chemical industry and extraction chemistry, can solve the problems of high preparation cost of new ionic liquids, difficulty in commercial production, difficulty in lithium recovery, etc., and achieve the effect of avoiding corrosion, simplifying the recovery process and simplifying the recovery steps

Active Publication Date: 2018-11-27
INST OF PROCESS ENG CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, lithium stripping still requires 6mol / L hydrochloric acid, which makes it difficult to recover lithium in the stripping solution, and the equipment is seriously corroded.
Patents CN101767804 and CN103710549 provide a new type of ionic liquid as a co-extraction agent or co-extraction agent, which improves the stripping effect of lithium, but the preparation cost of the new type of ionic liquid is high and it is difficult to produce commercially

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] In this example, the composition of the composite extraction system is: 40% TBP + 20% P507 as the extractant, kerosene as the diluent, and the Fe(III) loading capacity is 5.2 g / L.

[0027] In the lithium-containing brine, the lithium content is 1.6g / L, the chloride ion concentration is 298g / L, the sulfate radical concentration is 50g / L, the magnesium content is 106g / L, the sodium content is 14g / L, and the potassium content is 2.5g / L.

[0028] Using the composite extraction system and lithium-containing brine as raw materials, lithium is extracted through the following steps:

[0029] (1) Mix the composite extraction system with the lithium-containing brine at a ratio of 3:1, wherein the equivalent ratio of iron in the organic phase to lithium in the aqueous phase is 1.2. Hydrochloric acid was used to adjust the pH of the system to 0.12 for the extraction operation, and the single-stage extraction rate of lithium was 80.6%. After four stages of countercurrent extraction...

Embodiment 2

[0033] The composite extraction system is composed of: 20%TiAP+20%N503+10%P507+10%P204 as extraction agent, isotridecane as diluent, and Fe(III) loading capacity is 8.5g / L.

[0034] In lithium-containing brine, the lithium content is 1.6g / L, the chloride ion concentration is 298g / L, the sulfate radical concentration is 50g / L, the magnesium content is 106g / L, the sodium content is 14g / L, and the potassium content is 2.5g / L.

[0035] Using the composite extraction system and lithium-containing brine as raw materials, lithium is extracted through the following steps:

[0036](1) The composite extraction system is mixed with lithium-containing brine at a ratio of 3:1, wherein the equivalent ratio of iron in the organic phase to lithium in the aqueous phase is 2.0. Sulfuric acid was used to adjust the pH of the system to 0.5 for extraction operation, and the single-stage extraction rate of lithium was 85.3%. After five stages of countercurrent extraction, the extraction rate of li...

Embodiment 3

[0040] The composite extraction system consists of: 10% TBP+10% P507+10% Cyanex 272 as extractant, heptane as diluent, Fe(III) load 2.5g / L.

[0041] In lithium-containing brine, the lithium content is 0.3g / L, the chloride ion concentration is 150g / L, the sulfate radical concentration is 10g / L, the magnesium content is 45g / L, the sodium content is 12g / L, and the potassium content is 1.5g / L.

[0042] Using the composite extraction system and lithium-containing brine as raw materials, lithium is extracted through the following steps:

[0043] (1) Mix the composite extraction system with lithium-containing brine at a ratio of 1:1, wherein the equivalent ratio of iron in the organic phase to lithium in the aqueous phase is 1.0, and use sulfuric acid to adjust the pH of the system to 0.3 for extraction operations. Single-stage lithium The extraction rate was 78.2%. After five stages of countercurrent extraction, the extraction rate of lithium reaches 90.8%. The extraction rates of...

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Abstract

The invention discloses a composite extraction system and an extraction method for extracting lithium from lithium-containing brine. The composite extraction system is loaded with 2.5-10.4g / L of Fe(III), including 10%-60% of extractant A and 10%-30% of extractant B, and the balance is diluent, wherein the extraction The agent A is a neutral phosphine extractant and / or an amide extractant, the extractant B is an acidic phosphine extractant, and the percentage is the volume percentage in the composite extraction system. The composite extraction system of the invention can effectively extract lithium from lithium-containing brine, especially can effectively strip lithium at a pH of 1.0-1.8, avoid the corrosiveness of high-acid stripping to equipment, and lithium in stripping liquid easy to recycle.

Description

technical field [0001] The invention relates to the technical fields of extraction chemistry and chemical industry, in particular to a composite extraction system and an extraction method for extracting lithium from lithium-containing brine. Background technique [0002] Lithium is an important raw material for secondary clean energy. The wide application of lithium-ion batteries has promoted the rapid growth of lithium demand. In recent years, lithium consumption has increased at a rate of more than 10%. In 2016, China's lithium consumption reached 84,000 tons, and it is expected to exceed 90,000 tons in 2017. China is a big consumer of lithium, and its total lithium consumption has accounted for about 40% of the world's total consumption in recent years. China is rich in lithium resources, with a total reserve of 3.5 million tons, accounting for about 20% of global reserves, second only to Chile in the world. 85% of my country's lithium resources exist in salt lakes, and...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22B3/40C22B26/12
CPCC22B26/12C22B3/409Y02P10/20
Inventor 朱兆武张健齐涛王丽娜
Owner INST OF PROCESS ENG CHINESE ACAD OF SCI
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