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Method for removing impurity-aluminum in CeFCO3 rare earth ore leaching process

A technology for cerium fluorocarbonate and rare earth ore, which is applied in the rare earth field, can solve the problems of reducing product yield, removing aluminum and high operating cost, and achieves the effects of improving product yield, low operating cost and simple process

Active Publication Date: 2015-01-28
LESHAN SHENGHE RARE EARTH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to provide a method for removing impurity aluminum in the ore leaching process of cerium fluorocarbonate rare earth ore, so as to solve the problems of high operating cost and lower product yield in the existing method for removing aluminum

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0037] (1) Leaching cerium fluorocarbonate rare earth maglev ore with hydrochloric acid to obtain a rare earth feed solution.

[0038] (2) Add barium sulfate to the obtained rare earth feed solution in the amount of barium sulfate: rare earth oxide = 1:1000, and detect the iron content in the rare earth feed solution to ensure that iron in the rare earth feed solution: rare earth oxide = 1:76.

[0039] (3) Add a small amount of ammonia water to the rare earth feed liquid, adjust the pH to 4.6, stir evenly and filter.

[0040] (4) Al in the obtained feed liquid after filtration 2 O 3 Content 48ppm.

Embodiment 2

[0042] (1) Leach cerium fluorocarbonate rare earth magnetic beneficiation with hydrochloric acid to obtain rare earth feed solution.

[0043] (2) Add barium sulfate to the obtained rare earth feed solution, and the addition amount is barium sulfate: rare earth oxide = 1:800, and detect the iron content in the rare earth feed solution to ensure that iron in the rare earth feed solution: rare earth oxide = 1:55.

[0044] (3) Add a small amount of ammonia water to the rare earth feed liquid, adjust the pH to 4.9, stir evenly and filter.

[0045] (4) Al in the obtained feed liquid after filtration 2 O 3 The content is less than 32ppm.

Embodiment 3

[0047] (1) Leach cerium fluorocarbonate rare earth magnetic beneficiation with hydrochloric acid to obtain rare earth feed solution.

[0048] (2) Add barium sulfate to the obtained rare earth feed solution, the addition amount is barium sulfate: rare earth oxide = 1:100, and detect the iron content in the rare earth feed solution to ensure that iron in the rare earth feed solution: rare earth oxide = 1:99.

[0049] (3) Add a small amount of ammonia water to the rare earth feed liquid, adjust the pH to 4.7, stir evenly and filter.

[0050] (4) Al in the obtained feed liquid after filtration 2 O 3 The content is less than 35ppm.

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PUM

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Abstract

The invention discloses a method for removing impurity-aluminum in a CeFCO3 rare earth ore leaching process. The method comprises the following steps: (1) leaching CeFCO3 rare earth ore with hydrochloric acid to obtain a rare earth feed liquid; (2) adding barium sulfate into the obtained rare earth feed liquid, wherein the ratio of barium sulfate to rare earth oxide is equal to 1:1000-1:100, detecting the content of iron in the rare earth feed liquid, and ensuring the ratio of iron to rare earth oxide in the rare earth feed liquid to be more than or equal to 1:100; and (3) adding ammonium hydroxide into the rare earth feed liquid, adjusting the pH to be 4.5-5.0, stirring uniformly and filtering. The characteristic of aluminum element in the rare earth ore is researched, seed crystal and coprecipitates are added, the aluminum element is precipitated at certain pH, and the rare earth element is ensured not to be precipitated.

Description

technical field [0001] The invention belongs to the field of rare earths, and in particular relates to a method for removing impurity aluminum in a bastnaesite leaching process. Background technique [0002] After the bastnaesite rare earth ore is leached with hydrochloric acid, a mixed rare earth chloride liquid is produced, and the mixed rare earth chloride liquid is extracted for multi-stage extraction and separation. - Multistage extraction of neodymium liquid to separate and remove aluminum. [0003] In the original process, the content of aluminum in the mixed rare earth chloride is uncontrollable in the bastnasite leaching process. After leaching with hydrochloric acid, extraction and separation, aluminum is enriched in the praseodymium chloride-neodymium liquid. The aluminum content can reach 5000ppm, and the aluminum element can be separated and removed only after multi-stage extraction and separation. This method has large investment, high operating cost and reduc...

Claims

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Application Information

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IPC IPC(8): C22B3/44C22B59/00
CPCY02P10/20
Inventor 杜元忠曾明汤朝文童贵全朱利兵王静宋福宝刘艳蔡红艳
Owner LESHAN SHENGHE RARE EARTH CO LTD