Process for leaching rare earth elements

a rare earth element and processing technology, applied in the mining industry, can solve the problems of affecting the environmental situation, requiring the use of equipment made of highly alloyed molybdenum steel, and requiring aggressive sulphuric acid concentrations
US20200362436A1Inactive Publication Date: 2020-11-19KUNZE BERND +1
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Patent Information

Authority / Receiving Office
US · United States
Patent Type
Applications(United States)
Current Assignee / Owner
KUNZE BERND
Publication Date
2020-11-19
Estimated Expiration
Not applicable · inactive patent
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Abstract

Described herein is a process for stepwise leaching of all rare earth elements capable of forming peroxide and superoxide compounds, in particular cerium, lanthanum, neodymium, europium, from minerals containing these elements, namely from bastnaesites, orthites, chevkinites, and britholites.
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Description

CROSS-REFERENCE TO RELATED APPLICATION

[0001] This U.S. nonprovisional application claims priority to German Application No. 102019003556.9 filed May 19, 2019, the entire contents of which are incorporated herein by reference.TECHNICAL DESCRIPTION OF THE INVENTION

[0002] The present invention relates to the field of mining industry and specifically to the leaching of rare earth elements (REE).

[0003] The direct leaching of rare earth elements takes place by means of hydrochloric acid, sulphuric acid, nitric acid or mixtures thereof.

[0004] In patent RU 2547369 C2 dated 18 Feb. 2013 “Process for the complex treatment of residues from Domanik formations”, leaching is carried out by a multi-stage treatment with sulphuric acid of varying concentration, inter alia with the maximum aggressive concentration of 15 to 25%, at temperatures from 65° C. to 160° C. and at pressures from atmospheric pressure to 13 bar.

[0005] The disadvantage of this process is that the use of aggressive sulphuric acid con...

Claims

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