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Method for stripping lithium from loaded organic phase extracted from lithium-containing brine

An organic phase and brine technology, applied in the field of lithium stripping, can solve the problems of difficulty in obtaining high-purity lithium products, high cost, and difficult implementation, and achieve the effects of reducing process costs, avoiding equipment corrosion, and simplifying the recovery process.

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

The three stripping methods are difficult to obtain high-purity lithium products, the cost is high, and the implementation is difficult

Method used

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  • Method for stripping lithium from loaded organic phase extracted from lithium-containing brine

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Effect test

Embodiment 1

[0031] Using 40% TBP+20% P507 as extraction agent, kerosene as diluent, the concentration of loaded Li in the extraction system is 0.3g / L, and the concentration of Fe is 5.2g / L. Using water as the stripping agent, at the ratio of O / A=50:1, two-stage countercurrent stripping; adding the stripping agent in the second stage, the first stage Cl - The concentration is 2.1mol / L, the second grade Cl - The concentration is 1.8mol / L; the stripping rate of lithium is 99%, the concentration of lithium in the aqueous phase is 14.8g / L, and the stripping rate of iron is negligible. Lithium carbonate with a purity of 98% was obtained after sodium carbonate precipitation.

Embodiment 2

[0033] Using 40% TBP+20% P204 as extraction agent, kerosene as diluent, the concentration of loaded Li in the extraction system is 0.35g / L, and the concentration of Fe is 5.2g / L. Using water as the stripping agent, at the ratio of O / A=100:1, the five-stage countercurrent stripping; adding the stripping agent in the fifth stage, the first stage Cl - The concentration is 4.6mol / L, the second to fifth grade Cl - The concentration is 3.8-0.5mol / L; the stripping rate of lithium is 93%, the concentration of lithium in the aqueous phase is 32.6g / L, and the stripping rate of iron is negligible. Lithium carbonate with a purity of 98.5% was obtained after sodium carbonate precipitation.

Embodiment 3

[0035] Using 40% TBP+20% N503 as extraction agent, kerosene as diluent, the concentration of loaded Li in the extraction system is 0.28g / L, and the concentration of Fe is 4.7g / L. Using 1mol / L LiCl+0.4mol / L HCl as the stripping agent, at the ratio of O / A=20:1, three-stage countercurrent stripping; adding stripping agent in the third stage, the first stage Cl - The concentration is 1.9mol / L, the second to third grade Cl - The concentration is 1.8-1.2mol / L; the stripping rate of lithium is 85%, the concentration of lithium in the aqueous phase is 11.8g / L, and the stripping rate of iron is negligible. Lithium carbonate with a purity of 99% was obtained after sodium carbonate precipitation.

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Abstract

The invention relates to a method for stripping lithium from a loaded organic phase extracted from lithium-containing brine. In the method for stripping lithium, water or a low-acidity solution is used as strip liquor; a multistage reverse flow manner is adopted in a stripping process; and the stripping process comprises the following steps: in the first stage, adding the loaded organic phase extracted from the lithium-containing brine, contacting with first-stage strip liquor, and stripping, thereby acquiring lithium-loaded strip liquor; from the second stage to the second last stage, addingthe loaded organic phase after the stripping into the next stage and adding the lithium-loaded strip liquor after the stripping into the previous stage; and in the last stage, adding fresh strip liquor and stripping, thereby acquiring an organic phase for recycling. According to the method for stripping lithium provided by the invention, water or low-acidity strip liquor is adopted, multilevel chloride ion concentration is utilized to control the stripping of lithium and co-extracting iron ions, lithium is efficiently stripped, and meanwhile, iron is maintained in the organic phase, the equipment corrosion caused by high-acidity stripping and the cost increasing caused by additional alkali liquor are avoided, and the recycling process of lithium in strip liquor is simplified.

Description

technical field [0001] The invention belongs to the technical fields of extraction chemistry and chemical industry, and in particular relates to a method for back-extracting lithium from a loaded organic phase after extraction of 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 s...

Claims

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Application Information

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IPC IPC(8): C22B26/12C22B3/26
CPCC22B26/12C22B3/26Y02P10/20
Inventor 朱兆武张健王丽娜齐涛
Owner INST OF PROCESS ENG CHINESE ACAD OF SCI