Monazite ore comprehensive utilization and recovery process

A technology for monazite mines and monazite, which is applied in the field of comprehensive utilization and recovery of monazite mines, can solve problems such as difficult decomposition, poor extraction and phase separation, and difficult operation, so as to achieve the effects of recycling and reducing environmental pollution

Inactive Publication Date: 2017-02-01
永州市湘江稀土有限责任公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] First, monazite concentrate contains xenotime associated with it, its crystal form is stable, and it is difficult to decompose by monazite alkaline treatment, so after the hydrochloric acid is completely dissolved, there will still be a total amount of 5%-10% fully dissolved slag that cannot be dissolved , the total melting slag contains rare earth, uranium, thorium and other valuable elements, which belongs to radioactive slag, causing waste of resources and environmental problems;
[0007] Second, ilmenite is associated with monazite, so it mainly enters the thorium uranium (rare earth) excellent slag during the subsequent a

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] For zircon sand and / or monazite, the associated mineral of ilmenite, after enrichment by wet high-gradient magnetic separation at 0.4T, the content of monazite is 99.6wt.%, using 50wt.% NaOH to react at 140°C After 8 hours, the alkali-decomposed slurry was subjected to solid-liquid separation to obtain hydroxide solids and sodium phosphate solution, and the alkali-decomposed rate of monazite reached 99.0%. The hydroxide solid is preferentially dissolved in hydrochloric acid, the pH value is controlled at 1, and 0.5wt.% H is added 2 o 2 , 93% RE(OH) 3 Dissolve, and then return to pH=4.5 by alkali decomposition slurry to obtain RECl 3 The solution and the excellent molten slag were completely dissolved with 20wt.% hydrochloric acid at 98°C for 5 hours, and the acidity of the system was maintained at 2.5N during the control of the complete dissolution process, and the solid-liquid separation obtained a [RE+Th+U+Fe] concentration of 160g / L solution, where [TiO 2 ] was 1...

Embodiment 2

[0030] For zircon sand and / or monazite, the associated mineral of ilmenite, after enrichment by wet high-gradient magnetic separation at 0.9T, the monazite content is 99.8wt.%, and 50wt.% NaOH is used to react at 180°C for 4 Hours, the alkali decomposed slurry is separated into solid and liquid to obtain hydroxide solid and sodium phosphate solution, and the monazite alkali decomposition rate reaches 99.1%. The hydroxide solid is preferentially dissolved in hydrochloric acid, the pH value is controlled at 1, and 1wt.% H is added 2 o 2 , 95% RE(OH) 3 Dissolve, and then return to pH=4.5 by alkali decomposition slurry to obtain RECl 3 For the solution and excellent slag, use 25wt.% hydrochloric acid at 90°C for 3 hours to completely dissolve the hydrochloric acid. During the process of controlling the total dissolution, the acidity of the system is maintained at 2.1N, and the solid-liquid separation obtains a [RE+Th+U+Fe] concentration of 170g / L solution, where [TiO 2 ]=0.6g / ...

Embodiment 3

[0032]For zircon sand and / or ilmenite associated mineral monazite, after wet high-gradient magnetic separation enrichment at 0.6T, monazite 99.8wt.% was obtained, and 55wt.% NaOH was used to react at 130°C for 8 hours , Alkali decomposition slurry is separated from solid and liquid to obtain hydroxide solid and sodium phosphate solution, and the alkali decomposition rate of monazite reaches 98.7%. The hydroxide solid is preferentially dissolved in hydrochloric acid, the pH value is controlled at 1, and 2wt.% H is added 2 o 2 , 97% RE(OH) 3 Dissolve, and then return to pH=4.0 by alkali decomposition slurry to obtain RECl 3 For the solution and the excellent slag, use 30wt.% hydrochloric acid to fully dissolve the hydrochloric acid at 80°C for 5 hours, control the acidity of the system during the complete dissolution process to maintain 3.0N, and obtain a [RE+Th+U+Fe] concentration of 175g / L by solid-liquid separation solution, where [TiO 2 ]=0.8g / L, the slag rate is 0.7%. ...

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PUM

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Abstract

The invention relates to a monazite ore comprehensive utilization and recovery process, wherein monazite and xenotime and other associate minerals are completely separated through mineral dressing, and alkali decomposition treatment, preferred dissolving, complete dissolving and extraction separation are used, such that the recovery rate of rare earth, uranium and thorium is improved, and the production of radioactive waste residue is reduced. According to the present invention, the comprehensive utilization of the radioactive waste residue is achieved, the amount of the radioactive waste residue is reduced, and the environmental pollution is avoided; during the mineral dressing process, the titanium-containing ilmenite and the monazite are separated, such that the problem that titanium enters the subsequent rare earth, uranium, thorium extraction process so as to easily cause the generation of the three-phase matter is avoided; and H2O2 is added during the preferred dissolving process of the hydrochloric acid, such that the recovery rate of the rare earth is easily increased, and the extraction separation pressure of the subsequent complete dissolving residue is reduced.

Description

technical field [0001] The invention relates to a monazite ore comprehensive utilization and recovery process, specifically a method of thoroughly separating monazite from xenotime and other associated minerals through ore dressing, and then using alkali decomposition to process monazite to improve the recovery rate of rare earth, uranium and thorium , a process for reducing the generation of radioactive waste residues, belonging to the field of rare earth ore smelting and production. Background technique [0002] Monazite is one of the important rare earth ores. It also contains a considerable amount of uranium, which is a nuclear fuel urgently needed by the country at present, and contains a high content of thorium, which is a valuable resource for future important nuclear fuels. [0003] At present, the monazite mineral content in the industrially obtained concentrate can reach more than 95%, and the rest are associated minerals such as zircon sand, xenotime, and ilmenite...

Claims

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Application Information

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IPC IPC(8): C22B3/12C22B3/10C22B3/26
CPCY02P10/20
Inventor 俞正明李效平王凯严炳琛陈伯华李金叶徐学道
Owner 永州市湘江稀土有限责任公司
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