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Title:
METHOD FOR SELECTIVE NITRIC ACID LEACHING OF LITHIUM ELEMENTS IN ALUMINUM ELECTROLYTE
Document Type and Number:
WIPO Patent Application WO/2019/100673
Kind Code:
A1
Abstract:
Disclosed is a method for the selective nitric acid leaching of lithium elements in an aluminum electrolyte, comprising the following steps: S1. pulverizing and sieving an aluminum electrolyte containing lithium elements; S2. mixing nitric acid with water, and adjusting the pH value of the acid solution to be less than 4 and the potential to be between 0.015-0.8 V; S3. adding the aluminum electrolyte to the acid solution, stirring and heating same for leaching, wherein the reaction temperature is 20-85ºC, and the addition amount of the aluminum electrolyte is controlled depending on the fluoride ion concentration and acidity in the solution, with the acidity being of a pH value less than 4 and the fluoride ion concentration being greater than 1 g/L; S4. filtering and washing the mixed solution to obtain a filtrate and a filtered substance; and S5. using the filtrate for extracting the lithium elements, and washing and drying the filtered substance, and then returning same to the aluminum electrolysis plant for producing the aluminum electrolyte, and/or returning to the leaching process.

Inventors:
WANG ZHAOWEN (CN)
Application Number:
CN2018/087340
Publication Date:
May 31, 2019
Filing Date:
May 17, 2018
Export Citation:
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Assignee:
UNIV NORTHEASTERN (CN)
International Classes:
C22B26/12; C01F7/46; C22B3/06; C25C3/18
Domestic Patent References:
WO2016054683A12016-04-14
Foreign References:
CN107974565A2018-05-01
CN107935015A2018-04-20
CN107937722A2018-04-20
CN105543504A2016-05-04
CN105349786A2016-02-24
EP1269554A12003-01-02
Attorney, Agent or Firm:
BEIJING EASY JOY SOON IP AGENT LTD (CN)
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