Process for separating rare-earth element by extraction

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

Inactive Publication Date: 2010-07-21
GRIREM ADVANCED MATERIALS CO LTD
View PDF5 Cites 30 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

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

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Process for separating rare-earth element by extraction
  • Process for separating rare-earth element by extraction

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0045] The light-burned magnesia obtained by roasting magnesite at 850-900°C for 2 hours, add 3-5 times of water to digest at 80°C for 30 minutes, then adjust the slurry with water, the liquid-solid weight ratio is 80:1, and pass through Add carbon dioxide gas (concentration: 30%), react at 20°C for 40 minutes, and obtain a pure aqueous solution of magnesium bicarbonate (Mg0: 1.2%) through clarification and filtration.

[0046] Add magnesium bicarbonate aqueous solution at a flow rate of 3.73L / min, lanthanum cerium chloride solution (0.928mol / L) at a flow rate of 0.8L / min, and 1.5mol / L P507 organic phase at a flow rate of 4L / min into the 6-stage pre-extraction Co-flow extraction is carried out in the 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 content is less than 0.001mol / L.

[0047] The loaded organic phase is directly used for LaCe / Pr fractional ext...

Embodiment 2

[0049] The mixture of lightly burned magnesia and calcium oxide obtained by roasting dolomite at 800-850°C for 2 hours is digested and mixed with water. The liquid-solid weight ratio is 100:1, and then carbon dioxide gas (concentration is 40%) is introduced. React at 20° C. for 40 minutes, and obtain pure aqueous solution of magnesium bicarbonate and calcium bicarbonate (MgO+CaO: 0.92%) through clarification and filtration.

[0050] Magnesium bicarbonate and calcium bicarbonate aqueous solution are added at a flow rate of 6.4L / min, lanthanum cerium chloride solution (0.665mol / L) is at a flow rate of 1.5L / min, and 1.3mol / L P204 organic phase is added at a flow rate of 6L / min Extraction is carried out in 12-stage pre-extraction tanks, the mixing time is 25 minutes, and after 6-stage co-current and 6-stage countercurrent extraction, a loaded organic phase containing lanthanum and cerium is obtained. The rare earth content REO is 0.165mol / L, and the pH value of the raffinate aqueou...

Embodiment 3

[0053] Calcium oxide obtained by calcining limestone at 800-850°C for 2 hours, digested with water to adjust the slurry, the liquid-solid weight ratio is 16:1, and then pass through carbon dioxide gas (concentration is 60%), react at 70°C for 30 minutes, after After clarification and filtration, a pure aqueous solution of calcium bicarbonate (CaO: 6.25%) was obtained.

[0054] Add the calcium bicarbonate 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.

[0055] The loaded organic phase w...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

PUM

No PUM Login to view more

Abstract

The invention mixes and pre-extracts the mixed solution of acidic organic extractants such as P507, P204, C272, and naphthenic acid with magnesium bicarbonate and / or calcium bicarbonate solution and rare-earth solution. The rare-earth ions are extracted into the organic phase, then the loaded organic phase containing rare-earth ions are obtained through clarification, and can be used for the extract separation of the mixed rare-earth feed liquid. After a plurality of different levels of extraction, washing, stripping, single rare-earth compounds or rare-earth elements-containing enrichments can be obtained. The magnesium bicarbonate and/or calcium bicarbonate solution are prepared by roasting, digesting, carbonizing magnesite, limestone, calcite, dolomite and similar minerals, so that the content of impurities, such as silicon, iron, aluminum is lower. Ternary phase sediment is not produced in the pre-extraction and extraction separation process, so that the purity of the rare-earth products are not affected. The organic phase does not need ammonia saponification and does not produce ammonia-nitrogen wastewater. By adopting the invention, the production cost of rare-earth products is greatly lowered and the cost for three waste disposal is also greatly saved.

Description

technical field [0001] The invention relates to a process for extracting and separating rare earth elements with an acidic organic extractant. Specifically, the acidic organic extractant is mixed with magnesium bicarbonate and / or calcium bicarbonate aqueous solution and 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 Chemistry,...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

Application Information

Patent Timeline
no application Login to view more
IPC IPC(8): C22B3/26C22B59/00
CPCY02P10/20
Inventor 黄小卫龙志奇彭新林李红卫杨桂林韩业斌崔大立罗兴华赵娜王良士
Owner GRIREM ADVANCED MATERIALS CO LTD
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Try Eureka
PatSnap group products

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic.

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap