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Clean separating method of Baotou rare-earth ore concentrate

A rare earth concentrate and separation method technology, applied in the direction of improving process efficiency, can solve the problems of incomplete understanding of the direction of non-rare earth impurities, backward roasting equipment, etc., and achieve simplified extraction and separation process, less interference from solvent extraction, and simplified separation Effect

Inactive Publication Date: 2014-01-29
INST OF PROCESS ENG CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, because there was no high-grade rare earth concentrate (20-40% mixed ore) at that time, the roasting equipment was backward, and the agglomeration in the rotary kiln during the roasting process and the lack of understanding of the direction of non-rare earth impurities such as thorium, sulfur, phosphorus, and fluorine Thorough, there are some problems in the connection with the subsequent separation process and other reasons, it has not been applied in industry

Method used

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  • Clean separating method of Baotou rare-earth ore concentrate
  • Clean separating method of Baotou rare-earth ore concentrate
  • Clean separating method of Baotou rare-earth ore concentrate

Examples

Experimental program
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Effect test

Embodiment 1

[0054] The mixed rare earth concentrate (50% REO) was roasted with sodium carbonate, washed with water and pickled with 0.5 mol / L dilute hydrochloric acid, and then pickled with 5 mol / L nitric acid to obtain Ce-containing 4+ 、Th 4+ and the leaching solution of trivalent rare earth elements, using P503 extractant to extract Ce 4+ Th 4+ extraction, followed by separation of light rare earths.

[0055] Extraction of Ce with P503 Extractant 4+ The method is: use alkane solution with a volume ratio of 20~40%P503 as the extraction agent, after 5-8 stages of extraction, 7-10 stages of washing, 3~5 stages of countercurrent back extraction, the pH of the cerium stripping solution is adjusted to 1~2, add oxalic acid to precipitate cerium, wash the precipitate, and roast at 800~850°C for 0.5-2 hours to obtain CeO 2 Product, the purity is as high as 99.9%, ThO 2 / CeO 2 -4 .

[0056] Th extraction with P503 extractant 4+ The method is: use alkane solution with a volume ratio of 20-...

Embodiment 2

[0059] In Example 2, the mixed rare earth concentrate REO is 60%, and 0.5 mol / liter of dilute nitric acid is used for pickling, and the rest are the same as in Example 1.

Embodiment 3

[0061] In Example 3, the REO content of the mixed rare earth concentrate is 55%, and the mixed acid of 0.5 mol / L dilute sulfuric acid and dilute hydrochloric acid is used for pickling, and the rest are the same as in Example 1.

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Abstract

The invention relates to a clean separating method of Baotou rare-earth ore concentrate. The method comprises the following steps: roasting the rare-earth ore concentrate by using sodium carbonate; carrying out acid leaching by adopting a nitric acid after washing and pickling by a dilute acid, so as to obtain a leach liquor containing Ce4<+>, Th4<+> and trivalent rare-earth elements; respectively extracting the Ce4<+> and Th4<+> by adopting a P503 extracting agent, and then carrying out separation of light rare earth. By adopting the same extracting agent, selective separation of cerium, thorium and other trivalent rare earth can be achieved; the clean separating method is economical to a factory, small in equipment pressure, and easy to operate; only separation of lanthanum, praseodymium and neodymium exists in separation of the trivalent rare earth; the extraction technology is mature. Interference of an adjacent element trivalent cerium is not generated, so that the separation coefficient of lanthanum, praseodymium and neodymium is large; corresponding extraction and separation flows are greatly simplified and shortened.

Description

technical field [0001] The invention relates to a method for cleaning and separating rare earth concentrates, in particular, the invention relates to a method for cleaning and separating Baotou rare earth concentrates. Background technique [0002] The Baiyan Obo Mine in Baotou is mainly composed of bastnaesite and monazite, the ratio is about 6:4, and the cerium group elements account for about 98% of the total rare earth elements in the mineral. In addition to rare earths, the concentrate contains a large number of non-rare earth impurities, such as: iron, calcium, fluorine, phosphorus, silicon and radioactive element thorium (0.2%~0.3%), and thorium is a very useful renewable nuclear fuel, recycled crucial. At present, Baotou Rare Earth Mine mainly uses concentrated sulfuric acid to strengthen high-temperature roasting technology. Most of iron, phosphorus, and thorium are "burned" in the slag. The radioactive waste slag containing thorium and waste gas containing fluorin...

Claims

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Application Information

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IPC IPC(8): C22B1/02C22B3/04C22B3/38C22B59/00
CPCY02P10/20
Inventor 赵君梅刘会洲
Owner INST OF PROCESS ENG CHINESE ACAD OF SCI
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