Process for extracting and separating rare-earth elements

A rare earth element and extraction technology, applied in the field of rare earth solvent extraction and separation, can solve the problems of slow solid-liquid reaction, affecting product quality, incompleteness, etc., and achieve the effects of reducing production costs, saving three waste treatment costs, and eliminating pollution

Active Publication Date: 2011-03-30
GRIREM ADVANCED MATERIALS CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0009] The above three invention patent applications use alkaline earth metal minerals containing calcium and magnesium, or alkaline earth metal compound powder or slurry containing magnesium and/or calcium, that is, containing magnesium and/or calcium oxides, hydroxides, carbon Salt powder or water slurry is used to pretreat or pre-extract the organic phase. Since alkaline earth metal minerals containing calcium an

Method used

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  • Process for extracting and separating rare-earth elements
  • Process for extracting and separating rare-earth elements
  • Process for extracting and separating rare-earth elements

Examples

Experimental program
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Effect test

Embodiment 1

[0046] The light-burned magnesia obtained by roasting magnesite at 850-900°C for 2 hours is dissolved by adding glutaric acid, the liquid-solid weight ratio is 80:1, and the amount of glutaric acid is 110% of the theoretical amount. After reacting for 40 minutes, a pure magnesium glutarate aqueous solution (MgO: 1.2%) was obtained through clarification and filtration.

[0047] Add magnesium glutarate aqueous solution with a flow rate of 3.73L / min, lanthanum cerium chloride solution (0.928mol / L) with a flow rate of 0.8L / min, and 1.5mol / L P507 organic phase with a flow rate of 4L / min. Co-flow extraction is carried out in the extraction tank, the mixing time is 25 minutes, and the clarification is 20 minutes to obtain a loaded organic phase containing refractory rare earth ions lanthanum and cerium. The rare earth content REO is 0.185mol / L, and the pH value of the raffinate aqueous phase is 2.8. The content is less than 0.001mol / L.

[0048] The loaded organic phase is directly u...

Embodiment 2

[0050] The light-burned magnesia and calcium oxide mixture obtained by roasting dolomite at 800-850°C for 2 hours is dissolved by adding formic acid, the liquid-solid weight ratio is 100:1, the amount of formic acid is 120% of the theoretical amount, and the reaction is carried out at 20°C After 40 minutes, after clarification and filtration, pure aqueous solution of magnesium bicarbonate and calcium bicarbonate (MgO+CaO: 0.92%) was obtained.

[0051] Add magnesium formate and calcium formate aqueous solution at a flow rate of 6.4L / min, lanthanum cerium chloride solution (0.665mol / L) at a flow rate of 1.5L / min, and 1.3mol / L P204 organic phase at a flow rate of 6L / min into the 12th grade Extraction is carried out in the pre-extraction tank, the mixing time is 25 minutes, and after 6 stages of co-current and 6 stages of countercurrent extraction, the loaded organic phase containing lanthanum and cerium is obtained, the rare earth content REO is 0.165mol / L, and the pH value of the...

Embodiment 3

[0054] Calcium oxide obtained by calcining limestone at 800-850°C for 2 hours, was dissolved by adding butyric acid, the liquid-solid weight ratio was 16:1, the amount of butyric acid was 160% of the theoretical amount, reacted at 70°C for 30 minutes, after clarification Filter to obtain a pure aqueous solution of calcium butyrate (CaO: 6.25%).

[0055] Add the calcium butyrate aqueous solution at a flow rate of 1.12L / min, the lanthanum nitrate solution (0.744mol / L) at a flow rate of 1.5L / min, and the 1.5mol / L P507 organic phase at a flow rate of 6L / min into the 8-stage pre-extraction tank Carry out extraction, the mixing time is 25 minutes, after 5 stages of co-current and 3 stages of countercurrent extraction, a loaded organic phase containing refractory rare earth ion lanthanum is obtained, the rare earth content REO is 0.185mol / L, and the pH value of the raffinate aqueous phase is 4.5. REO content 0.0016mol / L.

[0056] The loaded organic phase was directly used for La / Ce ...

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Abstract

The invention provides a process for extracting and separating rare-earth elements. In the process, acid organic extracting agents such as P507, P204, C272 and naphthenic acid, aqueous solution of organic acid salt of magnesium and/or calcium, and rare-earth solution are mixed for pre-extraction; rare earth ions are extracted into an organic phase; and the organic phase is clarified to form a rare earth ion loaded organic phase used for extracting and separating mixed rare earth feed liquor. A single rare-earth compound or a concentrate of several rare-earth elements is obtained through multi-stage extraction-washing-back extraction. The aqueous solution of organic acid salt of magnesium and/or calcium is prepared by roasting minerals such as magnesite, limestone, calcite and dolomite and dissolving with organic acid; the contents of impurities such as silicon, iron and aluminium are low; three-phase substances are not generated in the pre-extraction and extraction and separation processes; the purity of rare earth products is not influenced; the organic phase is not subjected to ammonia saponification, and ammonia nitrogen wastewater is not generated; the production cost of the rare earth products is greatly reduced; and a great amount of three-waste treatment cost is saved.

Description

technical field [0001] The invention relates to a process for extracting and separating rare earth elements with an acidic organic extractant. Specifically, an acidic organic extractant is mixed with an aqueous solution of an organic acid salt of magnesium and / or calcium and a rare earth solution for pre-extraction, and the rare earth ions are extracted into the organic phase, and after clarification, a loaded organic extractant containing rare earth ions is obtained. The invention relates to the extraction and separation of mixed rare earth feed liquid, and belongs to the field of rare earth solvent extraction and separation. Background technique [0002] At present, the separation and purification of a single rare earth element in industry generally adopts solvent extraction. Phosphoric acid), C272 (two (2,4,4-trimethylpentyl) phosphonic acid) and other extractants extract and separate rare earth elements in hydrochloric acid system ([1] Collected Papers on Rare Earth Che...

Claims

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Application Information

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IPC IPC(8): C22B3/26C22B59/00
CPCY02P10/20
Inventor 彭新林黄小卫杨桂林龙志奇王良士韩业斌刘金良张顺利
Owner GRIREM ADVANCED MATERIALS CO LTD
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