Process for extracting rare earth element by non-saponifiable phosphorous mixing extractant

A technology of mixing extractants and rare earth elements, applied in the direction of improving process efficiency, can solve the problems of high nitric acid concentration, large acid consumption and high production cost, and achieve the advantages of improving stripping efficiency, improving production capacity and reducing acid consumption. Effect

Active Publication Date: 2006-07-19
GRIREM ADVANCED MATERIALS CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The first and second methods have good separation effects and are widely used, but they must be saponified with ammonia water, sodium hydroxide, ammonium bicarbonate, etc., which will produce a large amount of ammonia nitrogen wastewater and cause great pollution to the environment.
The third method is the process adopted by France Rhodia and American Molybdenum Company. It is derived from the rare earth nitrate solution obtained when processing monazite ore to separate rare earth. The concentration of nitric acid in the extraction system of this process is high, so the production cost is high. stop state
The fourth process was invented by Beijing General Research Institute of Nonferrous Me

Method used

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Examples

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Example

[0029] Comparative example 1

[0030] 1000 grams of bastnaesite and monazite mixed rare earth ore (REO 50%) are roasted in sulfuric acid, leached in water, neutralized and removed to obtain 11.5 liters of pure rare earth sulfate solution, its acidity is pH 4, and the main component is REO 40g / L, Fe<0.05g / L, P<0.005g / L, ThO2<0.001g / L; add 720g of ammonium bicarbonate to precipitate, wash and filter to obtain 945g of rare earth carbonate, add 970ml of concentrated hydrochloric acid to dissolve, then add 70 grams of barium chloride removes sulfate radicals to obtain 1703ml of rare earth chloride solution containing 260g / l (REO); this solution uses 1.5mol / l saponified P507 for neodymium / samarium extraction grouping, compared: organic phase / water phase / The washing liquid is 0.79 / 1 / 0.073, the organic phase saponification degree is 50% (consumption of liquid ammonia 72g), the load organic phase is washed with 4N hydrochloric acid (consumption of concentrated hydrochloric acid 52ml, abo...

Example Embodiment

[0033] Example 1

[0034] 1000 grams of bastnaesite and monazite mixed rare earth ore (REO 50%) are roasted in sulfuric acid, leached in water, neutralized and removed to obtain 11.5 liters of pure rare earth sulfate solution, its acidity is pH 4, and the main component is REO 40g / L, Fe<0.05g / L, P<0.005g / L, ThO2<0.001g / L, directly use 60% non-saponified P204 (1.0mol / L) and 40% non-saponified P507 (1.0mol / L) The mixed extractant of Nd / Sm is extracted into groups, using 7-level extraction, 13-level washing, and 8-level back extraction. Compared with: organic / feed liquid / washing liquid is 0.25 / 1 / 0.015, washing liquid is 210g containing samarium, europium, and gadolinium / l, 1.5N acidity rare earth chloride stripping solution (consumption of concentrated hydrochloric acid 110ml, about 121g), the concentration of rare earth in the washing section is 245g / l, the loaded rare earth organic phase containing rare earth 18g / l, back extraction with 6N hydrochloric acid to obtain 47ml (Nd2O3 / ...

Example

[0038] Comparative example 2

[0039] 1000 grams of bastnaesite and monazite mixed rare earth ore (REO 50%) are roasted in sulfuric acid, leached in water, neutralized and removed to obtain 12.5 liters of pure rare earth sulfate solution, the acidity is pH 4, and the rare earth concentration REO is 36.5 g / L, add 72ml concentrated sulfuric acid to the rare earth sulfate solution to adjust the acidity to 0.2N, use 1.0mol / L non-saponified P204 for Nd / Sm extraction grouping, use 7-stage extraction, 13-stage washing, and 8-stage back extraction. Ratio: organic / material liquid / washing liquid is 0.2 / 1 / 0.06, washing liquid adopts 1NH2SO4 (consumption 22ml concentrated sulfuric acid), rare earth concentration in washing section is 45g / l, loaded rare earth organic phase containing rare earth 4.2g / l, 6N hydrochloric acid is used By reverse extraction, 74ml of rare earth chloride solution containing 130g / L (REO) of samarium, europium and gadolinium and acidity of 2.5N (consumption of concentr...

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Abstract

The extraction and separation method for rare-earth element comprises: with rare-earth solution contained a plurality of rare-earth elements as material, preparing mixed extractant with the non-saponifiable P204 and one or two from P507, P229, P350, TBP, C272, C301, C302 and HEOPPA; in the mixed solution with rare-earth sulfate solution, or rare-earth sulfate and rare-earth chloride solution and rare-earth nitrate solution, extracting and separating rare-earth elements. This invention eliminates saponification to overcome pollution, reduces acidity to improve rare-earth concentration, and decreases the main material consumption more than 30% compared with the technique with NH4HCO3 and P507.

Description

technical field [0001] The invention relates to a process for extracting and separating rare earth elements. Specifically, the rare earth solution containing various rare earth elements obtained from the treatment of rare earth ores is used as raw material, and one or both of non-saponifiable P204 and non-saponifiable P507, P229, P350, TBP, C272, C301, C302, and HEOPPA are used. The invention relates to a process for extracting and separating rare earth elements in rare earth sulfuric acid solution or a mixed solution of rare earth sulfuric acid solution, rare earth chloride solution and rare earth nitrate solution with a prepared mixed extractant. Background technique [0002] Lanthanum, cerium, praseodymium, neodymium, promethium, samarium, europium, gadolinium, terbium, dysprosium, holmium, erbium, thulium, ytterbium, lutetium, yttrium, and scandium are collectively called rare earth elements. Their properties are very similar, except for promethium. Except for non-exist...

Claims

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Application Information

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IPC IPC(8): C22B3/26
CPCY02P10/20
Inventor 黄小卫李建宁彭新林龙志奇朱兆武崔大立赵娜刘营李红卫张国成
Owner GRIREM ADVANCED MATERIALS CO LTD
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