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Method for preparing rare-earth oxide

A technology of rare earth oxides and rare earths, applied in the fields of rare earth metal compounds, chemical instruments and methods, inorganic chemistry, etc., can solve the problems of wasting rare earth resources, etc., and achieve the effect of simple process, strong adaptability, and easy control of production operations

Inactive Publication Date: 2010-10-06
益阳桃江金牛稀土厂
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The fluoride slag contains 30% to 50% of rare earth, and contains fluorine ion (F - ), silicon (si), calcium (ca), iron (Fe), etc. 50%-70%, insoluble in acid, insoluble in water, and insoluble in alkali. In the past, manufacturers discarded it or used it for paving, etc., which was wasted precious rare earth resources

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0015] In this embodiment, electrolytic fluoride slag produced by electrolysis of rare earth metals is used as raw material. The electrolytic fluoride slag contains 50% rare earth (mainly praseodymium and neodymium), 20% fluorine, and 30% non-rare earth impurities.

[0016] A preparation method of rare earth oxide, it comprises the following steps:

[0017] (1) raw material treatment: use a vibration ball mill to grind the raw material to 250 mesh to 350 mesh (350 mesh in this embodiment);

[0018] (2) Roasting: Put the abrasive material obtained in step (1) into a roasting furnace, add concentrated sulfuric acid with a concentration of 98% by weight at a rate of 1:1.2 to 1.5 (1.5 in this embodiment), stir and heat to 150°C ~800 ℃ (this embodiment is 700 ℃), roasting time is 3 hours~6 hours (this embodiment is 6 hours), fluorine and rare earth are separated;

[0019] (3) Crushing: put the raw material roasted in step (2) into the crusher, and crush it to 50 mesh to 100 mesh (...

Embodiment 2

[0025] In this embodiment, xenotime is used as a raw material, with 55% rare earth content (yttrium, cerium, gadolinium, dysprosium, erbium, ytterbium), 30% phosphorus, and 15% non-rare earth impurities. A preparation method of rare earth oxide, it comprises the following steps:

[0026] (1) Raw material processing: use a vibration ball mill to grind the raw material to 300 mesh;

[0027] (2) roasting: the abrasive material obtained in step (1) is put into a roasting furnace, by weight, adding concentration is 98% concentrated sulfuric acid by 1: 1.4, stirring and heating to 450 DEG C, roasting time 4 hours, make phosphorus and rare earth separation;

[0028] (3) crushing: the raw material roasted through step (2) is added in the crusher, and crushed to 50 mesh;

[0029] (4) Leaching: Put the crushed raw materials in the step (3) into a dissolving tank, add water in a ratio of 1:4 by weight, stir to dissolve the rare earth in water, and perform leaching. The clarification ti...

Embodiment 3

[0034] In this embodiment, monazite ore is used as the raw material, the rare earth content is 60% (yttrium, cerium, gadolinium, neodymium, lanthanum, praseodymium), phosphorus is 20%, and non-rare earth impurities are 20%. A preparation method of rare earth oxide, it comprises the following steps:

[0035] (1) Raw material processing: use a vibration ball mill to grind the raw material to 250 mesh;

[0036] (2) roasting: put the abrasive material of step (1) gained in the roasting furnace, by weight, add the concentrated sulfuric acid that concentration is 98% by 1: 1.2, stir and be heated to 150 ℃, roasting time 3 hours, make phosphorus and rare earth separation;

[0037] (3) crushing: the raw material roasted through step (2) is added in the crusher, and crushed to 50 mesh;

[0038] (4) Leaching: Put the crushed raw materials in the step (3) into a dissolving tank, add water at a ratio of 1:5 by weight, stir to dissolve the rare earth in water, and perform leaching. The c...

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Abstract

The invention discloses a method for preparing a rare-earth oxide by using electrochemical fluorination residues generated by electrolyzing rare-earth metals. The method comprises the steps of treating, calcining, crushing, leaching and filtering raw materials, preparing the rare-earth oxide and the like. Compared with an alkaline method, the method has the advantages of simple process, short flow, easily controlled manufacture operation, low cost, small wastewater drainage and over 95 percent of recovery rate; and meanwhile, the method has strong adaptability to raw materials, can treat the electrochemical fluorination residues, rare-earth catalyst waste, waste battery scarp and the like, and can treat phosphor-containing xenotime and monazite.

Description

Technical field: [0001] The invention relates to a preparation method of rare earth oxides, in particular to a preparation method for producing rare earth oxides from electrolytic fluoride slag generated by electrolysis of rare earth metals. Background technique: [0002] As a unique mineral resource and production and processing technology in China, rare earth occupies an important position in the field of rare earth application in the world, and basically controls the world rare earth market. In 2009, China's rare earth exports exceeded 60,000 tons of oxides, and global rare earth consumption exceeded 100,000 tons of oxides. With the integration of the global economy and the development of the world economy and science and technology, the application scope and demand of rare earths are expanding day by day. It is estimated that by 2012, the global rare earth consumption will exceed 180,000 tons of oxides. However, the rare earth mineral resources in the world are limited. ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01F17/00
Inventor 王良
Owner 益阳桃江金牛稀土厂
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