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

Inactive Publication Date: 2020-11-19
KUNZE BERND +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The disadvantage of this process is that the use of aggressive sulphuric acid concentrations requires the use of equipment made of highly alloyed molybdenum steel.
Moreover, when sulphuric acid is used, the fluorides decompose at temperatures above 95° C. to form gaseous and water-soluble compounds, which impair the environmental situation.

Method used

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Examples

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Embodiment Construction

: The leaching process for rare earth elements was carried out as follows. Take 1 kg of crushed raw materials and put them in a container, pour 5 dm3 of tap water (solid:liquid=1:5) over them and add 200, 150, 100, 50 or 30 g FeCl3. The mixture was thoroughly mixed, then heated to 80-100° C. with simultaneous stirring and kept at this temperature for 1 hour, also with simultaneous stirring. The suspension was then filtered, dried and the solid residue weighed. The results of the mass loss experiments are shown in Table 1.

TABLE 1Iron trichloride consumption,(in % to the initial mass of the raw materials)20151053Mass loss of raw materials,5711157(in % to their initial mass)

[0065]As can be seen from the table, the maximum mass loss is observed when the consumption of iron trichloride is 5% in relation to the initial mass of the raw materials studied. This can be explained by the fact that the degree of hydrolysis of iron trichloride increases with decreasing concentration and that the ...

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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.

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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Application Information

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Patent Type & Authority Applications(United States)
IPC IPC(8): C22B3/16C22B59/00C22B3/32C22B3/22
CPCC22B59/00C22B3/0025C22B3/22C22B3/1691C22B3/06C22B3/165C22B3/44Y02P10/20C22B3/322
Inventor SULTANOV, MARATSULTANOV, AZIZKUNZE, BERND
Owner KUNZE BERND
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