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Method for preparing lithium hydroxide by taking waste metal lithium as raw material

A technology of lithium hydroxide and waste metal, applied in the direction of lithium oxide;/hydroxide, improvement of process efficiency, etc.

Active Publication Date: 2021-01-26
湖南金凯循环科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] At present, there is no relevant report on the preparation of lithium hydroxide from waste lithium metal

Method used

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  • Method for preparing lithium hydroxide by taking waste metal lithium as raw material

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] Step 1, slicing the non-metallic lithium in a helium atmosphere or an argon atmosphere, and cutting the waste metal lithium into thin slices with a length not greater than 20 cm and a thickness not greater than 0.5 cm;

[0034] Step 2. Put the sliced ​​waste metal lithium slices into a reaction vessel equipped with water in a helium atmosphere or an argon atmosphere protection. The reaction vessel is a negative pressure exhaust or an open container. The waste metal lithium slices and water The mass ratio is 5:100;

[0035] Step 3: Stir the waste metal lithium flakes and water through the stirring device installed in the reactor, so that the non-metallic lithium and water are fully contacted to ensure that the waste metal lithium and water fully react, and the waste metal lithium flakes are reacted in the reaction vessel for 2 hours , and then add an alkaline reagent in the reactor to adjust the pH value of the lithium hydroxide solution to 10;

[0036] Step 4, filter t...

Embodiment 2

[0041] Step 1, slicing the non-metallic lithium in a helium atmosphere or an argon atmosphere, and cutting the waste metal lithium into thin slices with a length not greater than 20 cm and a thickness not greater than 0.5 cm;

[0042] Step 2. Put the sliced ​​waste metal lithium slices into a reaction vessel equipped with water in a helium atmosphere or an argon atmosphere protection. The reaction vessel is a negative pressure exhaust or an open container. The waste metal lithium slices and water The mass ratio is 15:100;

[0043] Step 3: Stir the waste metal lithium flakes and water through the stirring device installed in the reactor, so that the non-metallic lithium is in full contact with the water to ensure that the waste metal lithium and water fully react, and the waste metal lithium flakes are reacted in the reaction vessel for 3 hours , and then add an alkaline reagent in the reactor to adjust the pH value of the lithium hydroxide solution to 11;

[0044] Step 4, fil...

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Abstract

The invention relates to the technical field of recycling of waste resources, in particular to a method for preparing lithium hydroxide by taking waste metal lithium as a raw material. The method comprises the following steps of 1, slicing the waste metal lithium in a protective atmosphere; 2, putting the sliced waste metal lithium sheets into a reaction container which is filled with water and isused for pumping negative pressure to exhaust air or is provided with an opening; 3, enabling the waste metal lithium sheets to react in the reaction container for 0.5 hours-5.0 hours; and 4, filtering to obtain slag and a lithium hydroxide solution. The method has the beneficial effects that the safety of operation is ensured by slicing the waste metal lithium in the protective atmosphere, negative pressure pumping or opening of the reaction container is required to ensure that hydrogen generated in the reaction process can be discharged, explosion caused by high hydrogen concentration is avoided, the waste metal lithium is cut into slices with the length of 2cm-20 cm and the thickness of 0.2cm-1.0 cm, it is ensured that the reaction speed is not too low, and the leaching efficiency is not influenced; and meanwhile, it is ensured that combustion or explosion cannot happen due to the fact that the reaction speed is too high, and high-purity battery-grade lithium hydroxide can be prepared.

Description

technical field [0001] The invention relates to the technical field of recycling and utilization of waste resources, in particular to a method for preparing lithium hydroxide by using waste metal lithium as a raw material. Background technique [0002] Lithium metal has been widely used in the field of lithium batteries, and the application has brought about the generation of waste materials such as lithium metal slag and leftovers. [0003] At present, there is no relevant report on the preparation of lithium hydroxide from waste lithium metal. Contents of the invention [0004] (1) Solved technical problems [0005] In view of the deficiencies in the prior art, and in order to develop new technologies, the purpose of the present invention is to provide a method for preparing lithium hydroxide from waste metal lithium as a raw material. The method reclaims waste metal lithium in the form of lithium hydroxide to realize waste Recovery of metallic lithium resources. [0...

Claims

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Application Information

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IPC IPC(8): C22B7/00C22B1/00C22B26/12C01D15/02
CPCC22B7/006C22B1/005C22B26/12C01D15/02Y02P10/20Y02W30/84
Inventor 颜群轩颜群湘伍习飞唐莎
Owner 湖南金凯循环科技有限公司