Method for recovering lithium from lithium-containing electrode waste material

A lithium electrode, lithium recovery technology, applied in the direction of lithium oxide;/hydroxide, lithium carbonate;/acid carbonate, etc., can solve the problems of low lithium concentration and low lithium recovery rate, and achieve high High, short leaching time, easy industrial application effect

Inactive Publication Date: 2018-06-29
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

This method uses traditional carbothermal reduction, and its disadvantages are that the recov

Method used

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  • Method for recovering lithium from lithium-containing electrode waste material

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Embodiment 1

[0049] The present embodiment provides a kind of method that reclaims lithium from lithium-containing electrode waste material, and its specific method is:

[0050] Put the lithium-ion battery positive electrode waste (lithium cobalt oxide battery positive electrode waste) in the tube furnace, and the gas flow rate is 1.0L min -1 H 2 , reduced and roasted at 800°C for 1 hour, then cooled with the furnace, and the gas was changed to 0.2L min during cooling -1 Ar. Take an appropriate amount of the reduced material, press 200g·L -1 Add deionized water to the solid-to-liquid ratio, place in a 50°C water bath for leaching for 60 minutes, and filter to obtain a lithium-rich aqueous solution and filter residue.

[0051] The lithium-containing product is prepared by distilling a lithium-rich aqueous solution with an evaporation crystallizer to obtain lithium hydroxide monohydrate.

[0052] The process flow of the method for recovering lithium from lithium-containing electrode wast...

Embodiment 2

[0058] The present embodiment provides a kind of method that reclaims lithium from lithium-containing electrode waste material, and its specific method is:

[0059] Put the nickel-cobalt-lithium-manganese-oxide positive electrode waste into the tube furnace, and the gas flow rate is 0.5L min -1 H 2 , baked at 700°C for 4 hours, then cooled with the furnace, and the gas was changed to 0.2L min during cooling -1 Ar. Take an appropriate amount of the reduced material, press 100g·L -1 Add deionized water to the solid-liquid ratio, place in a 60°C water bath for leaching for 20 minutes, and filter to obtain a lithium-rich aqueous solution and filter residue.

[0060] Add 0.1L min to the lithium-rich aqueous solution at room temperature -1 Carbon dioxide, precipitated lithium carbonate.

[0061] In this example, the concentration of lithium in the lithium-rich aqueous solution was 8.3 g L as detected by ICP-OES -1 . According to XRD analysis, the main phases of filter residue...

Embodiment 3

[0066] The present embodiment provides a kind of method that reclaims lithium from lithium-containing electrode waste material, and its specific method is:

[0067] Put the positive electrode waste of nickel-cobalt lithium manganese oxide battery in a tube furnace, and the gas flow rate is 1.5L min -1 H 2 , baked at 700°C for 1 hour, then cooled with the furnace, and the gas was changed to 0.1L min during cooling -1 Ar. Take an appropriate amount of reduced material, press 300g·L -1 Add deionized water to the solid-to-liquid ratio, place in a 60°C water bath for leaching for 100 minutes, and filter to obtain a lithium-rich aqueous solution and filter residue.

[0068] Add 0.5L min to the lithium-rich aqueous solution at room temperature -1 Carbon dioxide, precipitated lithium carbonate.

[0069] In this example, the concentration of lithium in the lithium-rich aqueous solution is 20.8 g L as detected by ICP-OES -1 . According to XRD analysis, the main phases of filter r...

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Abstract

The invention provides a method for recovering lithium from a lithium-containing electrode waste material. The method comprises the following steps of (1) roasting the lithium-containing electrode waste material under a reducing atmosphere, after roasting, cooling under a protective atmosphere to obtain a reduced material, leaching the reduced material through a leaching agent, and carrying out solid-liquid separation to obtain a lithium-containing solution and solid slags; (2) preparing the lithium-containing solution in the step (1) into a lithium-containing product. According to the methodprovided by the invention, a reducing gas is adopted for reducing roasting, so that the roasting temperature is low, and the energy consumption is less; and one-step leaching is carried out after reducing, so that high-efficient separation of lithium and other metal elements can be realized, the concentration of the lithium in the leaching agent is high, the recovery rate of the lithium is greatlyimproved, the recovered lithium-containing product has high purity, and in addition, other transition metal elements in the waste electrodes can be further recovered. The method provided by the invention is short in flow, low in cost, and easy to realize industrial application.

Description

technical field [0001] The invention belongs to the technical field of secondary resource recycling and circular economy, and relates to a method for recovering lithium from lithium-containing electrode waste. Background technique [0002] The natural reserves of lithium in the earth's crust are 11 million tons, accounting for about 0.0065% of the elements in the earth's crust. In nature, it mainly exists in the form of salt lake brine, spodumene, lepidolite and phosphate ore. Lithium is mainly extracted from lithium-containing ores and salt lake brine, and is used in lithium-ion batteries, ceramics, glass and lubricants. my country's spodumene ore has low grade, unstable quality, and high mining and dressing costs. The ore mainly depends on imports; the lithium content in salt lake brine is low, the ratio of magnesium to lithium is high, and the removal of impurities is complicated. With the development and utilization of primary lithium resources, the recycling of seconda...

Claims

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Application Information

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IPC IPC(8): C22B7/00C22B26/12C22B1/02C22B47/00C22B23/00
CPCC22B1/02C22B7/006C22B23/0407C22B26/12C22B47/00C01D15/02C01D15/08
Inventor 孙峙刘春伟曹宏斌
Owner INST OF PROCESS ENG CHINESE ACAD OF SCI
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