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Method for preparing lithium carbonate from lithium-containing electrode wastes

A lithium electrode and lithium carbonate technology, applied in the field of lithium carbonate preparation, can solve the problems of increasing the processing burden and energy consumption of the separation process, reducing the overall recovery rate of lithium, reducing the concentration of lithium ions, etc., and achieving the goal of simplifying leaching and selective removal Process, extraction and selective separation to promote and realize the effect of recovery

Inactive Publication Date: 2018-08-14
INST OF PROCESS ENG CHINESE ACAD OF SCI
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  • Abstract
  • Description
  • Claims
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Problems solved by technology

The method uses a sodium hydroxide solution containing a large amount of organic solvents to adjust the pH of the acid leaching solution, which greatly reduces the concentration of lithium ions in the acid leaching solution, resulting in a low lithium precipitation rate in the subsequent preparation of lithium carbonate, thereby reducing the overall recovery rate of lithium. , and the introduction of organic reagents increases the processing burden and energy consumption of the subsequent separation process

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  • Method for preparing lithium carbonate from lithium-containing electrode wastes

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Embodiment 1

[0061] The present embodiment provides a kind of method that lithium carbonate is prepared with lithium-containing electrode waste, and its concrete method is:

[0062] (1) After grinding and screening lithium nickelate waste balls (containing lithium battery waste), add dilute sulfuric acid (aqueous solution) for slurry treatment. The solid-to-liquid ratio is 10g / L. Preheat to 70°C and place in airtight closed electrolysis In the tank, the titanium sheet is used as the anode, the carbon rod is used as the cathode, and the electrode current density is 500A / m 2 Carry out electrolysis (electrochemical treatment), apply mechanical stirring, the speed is 400rpm, and react for 6h to obtain a reaction slurry; filter the reaction slurry to obtain lithium-containing purification liquid and tailings, and obtain solid deposits on the surface of the cathode. The emission spectrometer (ICP) is used to analyze the content of various elements in the tailings, purified liquid and sediment, a...

Embodiment 2

[0067] The present embodiment provides a kind of method that lithium carbonate is prepared with lithium-containing electrode waste, and its concrete method is:

[0068] (1) Lithium cobaltate waste was roasted at 400°C for 2 hours, then added into dilute nitric acid for slurry treatment, the solid-to-liquid ratio was 15g / L, preheated to 85°C, placed in a closed electrolytic cell at atmospheric pressure, For the anode and cathode, the electrode current density is 800A / m2 Perform electrolysis, apply mechanical stirring, the rotating speed is 500rpm, and react for 4 hours to obtain a reaction slurry; the reaction slurry is filtered to obtain lithium-containing purification liquid and tailings, and solid deposits are obtained on the surface of the cathode, and ICP is used to treat the tailings, Analyze the content of each element in the purified liquid and sediment, and use XRD to analyze the phase structure of the sediment;

[0069] (2) Add potassium hydroxide and potassium carbon...

Embodiment 3

[0072] The present embodiment provides a kind of method that lithium carbonate is prepared with lithium-containing electrode waste, and its concrete method is:

[0073] (1) LiNi 0.5 co 0.2 mn 0.3 o 2 (NCM523) The waste material is pre-soaked in NaOH solution to remove the aluminum foil, washed and dried, and then added to dilute sulfuric acid for slurry treatment. The solid-to-liquid ratio is 30g / L. With carbon rods as anode and cathode, the current density is 800A / m 2 Perform electrolysis, apply mechanical stirring, the rotation speed is 700rpm, and react for 8 hours to obtain a reaction slurry; filter the reaction slurry to obtain lithium-containing purification liquid and tailings, and obtain solid substances on the surface of the cathode and anode, and use ICP to enrich Analyze the content of each element in the slag, filtrate, cathode deposits, and anode deposits, and use XRD to analyze the phase structure of the cathode deposits and anode deposits;

[0074] (2) addi...

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Abstract

The invention provides a method for preparing lithium carbonate from lithium-containing electrode wastes. The method comprises the following steps: (1) pulping the lithium-containing electrode wastesby using an aqueous solution, and then performing electrochemical treatment to obtain a reaction slurry, carrying out solid-liquid separation on the reaction slurry, wherein the obtained liquid is a lithium-containing purged liquor; (2) adjusting the lithium-containing purged liquor to be alkaline, and adding carbonate for carrying out a lithium precipitation reaction, carrying out solid-liquid separation after reaction, wherein the obtained solid is lithium carbonate. The method provided by the invention is short in flow, simple to operate and accurate and controllable in reaction process; nothree wastes are discharged in the whole process; the consumption of alkaline substances is greatly reduced; the recovery selectivity and the single extraction rate of the lithium can reach more than95%; the purity of the obtained lithium carbonate product meets the requirements of battery-grade lithium carbonate; moreover, the high-value conversion of other metal components in the lithium-containing electrode wastes can be realized.

Description

technical field [0001] The invention relates to the field of resource utilization of waste lithium ion batteries, in particular to a method for preparing lithium carbonate from lithium-containing electrode waste. Background technique [0002] Lithium-ion batteries are widely used in 3C digital products, electric vehicles, energy storage and other fields due to their outstanding advantages such as high energy density, light weight, long cycle life, and no memory effect. Accompanied by it, the generation of a large number of waste lithium-ion batteries has posed a severe challenge to the electronic waste disposal and environmental protection in my country and the world. On the one hand, waste lithium-ion batteries contain toxic and flammable electrolytes, heavy metals and other harmful components. If they are not handled properly, they will cause serious water and soil pollution, and even cause fires, explosions and other safety accidents; on the other hand, waste batteries co...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M10/54
CPCY02W30/84H01M10/54
Inventor 孙峙王中行曹宏斌林晓张懿
Owner INST OF PROCESS ENG CHINESE ACAD OF SCI
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