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One-step production method for cerium poor rare earth fluoride and cerium fluoride

A technology of rare earth chloride and cerium fluoride, which is applied in the fields of rare earth metal compounds, chemical instruments and methods, inorganic chemistry, etc., can solve the problems of high treatment cost, high cost, and high labor intensity, and achieve equipment efficiency improvement, energy The effect of reducing consumption and reducing fluorine emission

Active Publication Date: 2012-02-29
LESHAN SHENGHE RARE EARTH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Such a process has the following problems and deficiencies: the ore after roasting has undergone multiple optimization processes, alkali conversion, water washing, and filtration, and the process flow is long; because the process is repeated, the slag needs to be transported many times, and the labor intensity is high; the filter residue needs to be washed after alkali conversion , containing fluorine and alkali in the washing solution, the discharge of the waste water seriously pollutes the environment, the cost of its treatment is high, and the difficulty is great; such a process has low utilization efficiency of equipment; alkali conversion needs to consume 0.28 tons of liquid sodium hydroxide per ton of ore, During the alkali conversion process, it is necessary to keep the temperature in the alkali transfer tank at 100-120 degrees 24 hours a day, which consumes a lot of electric energy and water vapor. The alkali cake after alkali conversion also needs a lot of water and flocculant lotion. , the cost is high; the fluorine discharged directly is a product demanded by the market

Method used

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  • One-step production method for cerium poor rare earth fluoride and cerium fluoride
  • One-step production method for cerium poor rare earth fluoride and cerium fluoride
  • One-step production method for cerium poor rare earth fluoride and cerium fluoride

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specific Embodiment 1

[0022] The one-step production method of cerium-less rare earth chloride and cerium fluoride comprises the following steps:

[0023] D. Oxidation roasting of rare earth concentrate;

[0024] E. Perform dilute hydrochloric acid to dissolve the rare earth concentrate after oxidation and roasting, and add a catalyst;

[0025] F. Filter and separate the slag and solution after excellent dissolution.

[0026] The catalyst is 5% sulfuric acid, and the addition amount is 0.8% of the hydrochloric acid consumption, and the addition method is to add first or simultaneously, after excellent dissolution, the content of cerium in the dilute chloride diagram with less cerium and rich lanthanum is 6-18%, which is rich in lanthanum. The content of cerium in cerium slag is not less than 93%.

[0027] A catalyst is added in the dilute hydrochloric acid dissolving process to make cerium participate in the reaction. Using the principle of preferential complexation of fluorine, the cerium and fl...

specific Embodiment 2

[0028] The one-step production method of cerium-less rare earth chloride and cerium fluoride comprises the following steps:

[0029] G. Oxidation roasting of rare earth concentrate;

[0030] H. Carry out dilute hydrochloric acid to the rare earth concentrate after oxidizing and roasting, and add a catalyst;

[0031] 1. Filtration and separation of slag and solution after excellent dissolution.

[0032] The acid catalyst is 8% nitric acid, the addition amount is 0.8% of the hydrochloric acid consumption, and the addition method is to add first or at the same time. The content of cerium in cerium slag is not less than 93%.

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Abstract

The invention relates to a non-ferrous metal rare-earth separating method, concretely, a one-step production method for cerium poor rare earth fluoride and cerium fluoride, wherein the one-step production method for cerium poor rare earth fluoride and cerium fluoride, comprising the following steps of: A. oxidizing and roasting rare-earth ore concentrate; B. selectively dissolving the rare-earth ore concentrate with dilute hydrochloric acid after oxidizing roasting, and adding a catalyst; C. filtrating and separating the SLAG and the solution after selective dissolution. The method of the invention can implement zero discharge of waste water, reduce the cost, increase product value, decrease process flow, and reduce labor strength.

Description

technical field [0001] The invention relates to the separation of rare earths from nonferrous metals, in particular to a one-step production method of rare earth chloride and cerium fluoride with less cerium. Background technique [0002] At present, the production method of cerium rare earth chloride widely used in the industry is as follows: oxidation roasting, primary hydrochloric acid optimal dissolution, filtration, filter residue alkali transfer, 11 to 13 times of water washing, filtration; second optimal dissolution, filtration; third optimal dissolution, filtration . Such a process has the following problems and deficiencies: the ore after roasting has undergone multiple optimization processes, alkali conversion, water washing, and filtration, and the process flow is long; because the process is repeated, the slag needs to be transported many times, and the labor intensity is high; the filter residue needs to be washed after alkali conversion , containing fluorine a...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01F17/00
Inventor 周继海王满合熊志刚陈学松王全根
Owner LESHAN SHENGHE RARE EARTH CO LTD
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