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Technique for processing monazite through alkaline method and separating rare earth through extraction

A technology for monazite and rare earth, which is applied in the field of alkaline treatment of monazite, extraction and separation of rare earth, and organic phase loaded with rare earth, can solve problems such as environmental pollution, and achieve the effect of reducing alkali consumption, radioactive pollution and inhibiting harmful problems.

Active Publication Date: 2016-11-23
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

In the extraction process, rare earth chloride is used as the feed liquid, and ammonia water or sodium hydroxide must be used to saponify the organic matter, and the rare earth is separated through the extraction section, washing section and stripping section through fractional distillation extraction. This process produces a large amount of ammonia nitrogen or high-salt wastewater. environmental pollution

Method used

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  • Technique for processing monazite through alkaline method and separating rare earth through extraction

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0043] The REO content is 51.2% monazite (ThO2 content 3.9%) and 40% liquid caustic soda are placed in the reaction kettle of nitrogen protection atmosphere with the liquid-solid ratio of 3:1, adopt far-infrared heating to 140 ℃ decomposition reaction, reaction After the slurry is filtered and washed, the decomposition rate of monazite is 97.9%. Among them, the proportion of cerium Ce3+ / ΣCe in the form of +3 valence cerium hydroxide in the rare earth hydroxide is 89%. The lye in the filtrate is recovered and recycled, and the ton ore consumption Sodium hydroxide 0.57 tons.

[0044] Dissolve the rare earth hydroxide alkali cake with 0.2mol / L P204 at 20°C, no chlorine gas is generated on site during the process of dissolving the above filter cake, and an organic phase with a loaded rare earth concentration of 0.02mol / L is obtained, and the extraction yield of rare earth It reaches 99.1%, the extraction yield of thorium is 0.035%, and the separation of thorium and rare earth is r...

Embodiment 2

[0047] Put monazite with REO content of 31.1% (ThO2 content 3.1%) and 65% liquid caustic soda at a liquid-solid ratio of 1.5:1 in a reaction kettle with an argon protective atmosphere, and use eddy current electric heating to 80°C for decomposition and reaction , the reaction slurry is filtered and washed, and the monazite decomposition rate is 96.5%, wherein the cerium ratio Ce3+ / ΣCe existing in the form of +3 valence cerium hydroxide in the rare earth hydroxide is 95%, and the lye is recovered and recycled in the filtrate, tons The mine consumes 0.42 tons of sodium hydroxide.

[0048] Dissolve the rare earth hydroxide alkali cake with 0.5mol / L C272 at 50°C, no chlorine gas is generated on site during the process of dissolving the above filter cake, and an organic phase with a loaded rare earth concentration of 0.05mol / L is obtained, and the extraction yield of rare earth It reaches 99.0%, the extraction yield of thorium is less than 0.01%, and the separation of thorium and r...

Embodiment 3

[0051] Put REO content of 64.9% monazite (ThO2 content of 4.3%) and 20% liquid caustic soda at a liquid-solid ratio of 10:1 in a tubular reactor with a helium protective atmosphere, and use steam to heat to 345°C for decomposition reaction Finally, the reaction slurry is filtered and washed, and the monazite decomposition rate is 98.5%, wherein the cerium ratio Ce3+ / ΣCe in the form of +3 valence cerium hydroxide in the rare earth hydroxide is 85%, and the lye in the filtrate is recovered and recycled. Ton of ore consumes 0.71 tons of sodium hydroxide.

[0052] Dissolve the rare earth hydroxide alkali cake with 0.9mol / L naphthenic acid at 30°C, no chlorine gas is generated on site during the process of dissolving the above filter cake, and an organic phase with a loaded rare earth concentration of 0.09mol / L is obtained, and the extraction yield of the rare earth is The extraction rate reaches 92.5%, the extraction yield of thorium is 0.014%, and the separation of thorium and ra...

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Abstract

The invention provides a technique for processing monazite through an alkaline method and separating rare earth through extraction. According to the specific scheme, the monazite is processed through the alkaline method under the non-oxidation protection atmosphere, hydroxide containing trivalent rare earth is obtained, and the hydroxide is directly reacted with an acidic extraction agent to obtain an organic phase containing rare earth. Compared with hydroxide of tetravalent cerium, hydroxide of trivalent cerium has the characteristics of being dissolved easily and capable of reducing acid consumption, and conditions are created for the subsequent situations that the rare earth is dissolved by an acidulous extraction agent preferentially and the rare earth is separated from impurities such as indissolvable thorium dioxide. The hydroxide of the trivalent rare earth is directly dissolved with the acidic extraction agent, the problem that acid-base consumption is too high due to the fact that the rare earth is separated through organic liquid caustic soda or in an ammonium hydroxide saponification mode is solved, and procedures are simplified.

Description

technical field [0001] The present invention relates to a process for alkali treatment of monazite and rare earth extraction and separation, specifically a process for alkali treatment of monazite under a non-oxidative protective atmosphere to obtain trivalent rare earth hydroxides, which are directly mixed with acidic extractants Performing a reaction to obtain an organic phase loaded with rare earth, belonging to the field of rare earth ore smelting and production Background technique [0002] Monazite is an industrial rare earth phosphate mineral, which is easy to sort, and the content of monazite in the obtained concentrate can reach more than 95%. In industry, the caustic soda decomposition method is generally used to treat monazite concentrate. ["Rare Earth", Volume 1 of the first edition, Metallurgical Industry Press 1978, P221-237. )] In industry, the traditional process is to use caustic soda and concentrate to prepare in proportion to enter the decomposition tank...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22B3/12C22B3/26C22B59/00C22B60/02
CPCY02P10/20
Inventor 李效平王凯
Owner 永州市湘江稀土有限责任公司
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