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Method of acidic extractant complexing extraction separation rare-earth element

A technology of acidic extractant and rare earth elements, which is applied in the field of separating single or several groups of rare earth elements through complex extraction of acidic phosphorus-type extractants, can solve the problems that do not involve rare earth extraction sub-processes, etc., and is beneficial to the control and management of the production process , reduce pollution, omit the effect of saponification treatment process

Inactive Publication Date: 2008-05-21
NORTHEASTERN UNIV LIAONING
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the application example of patent 200510098261.4 only confirmed the extraction effect of this method at a low metal ion concentration (REO≤48g / L), and did not involve a high-concentration rare earth solution (REO=200~300g / L) rare earth extraction sub-process

Method used

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Examples

Experimental program
Comparison scheme
Effect test

example 1

[0027] Dilute P204 (commercially available) extractant with 260# sulfonated kerosene (commercially available) to an organic phase containing P204=1.5±0.2mol / L. The rare earth chloride solution prepared from monazite ore contains a total concentration of rare earth elements REO=280±20g / L, and the distribution of rare earth elements is the difference between the mass of each rare earth element and the mass of total rare earth element oxides REO in terms of oxides. The percentage ratio is: La 2 o 3 / REO=25%; CeO 2 = 51%; Pr 6 o 11 = 6.5%; Nd 2 o 3= 15.5%; medium and heavy rare earths (calculated as oxides) = 2%. Add citric acid to the solution to prepare a rare earth aqueous solution containing 0.23 ± 0.02mol / L citric acid and pH = 0.5-1, fill the prepared organic phase and rare earth aqueous solution at a volume ratio of 1:1 into the extraction tank, and LaCePrNd is separated from medium and heavy rare earths by fractional distillation extraction. The fractional distillat...

Embodiment 2

[0033] The separation method that present embodiment adopts is identical with embodiment 1, and difference is: (1) P204 (commercially available) extraction agent is used commercially available 260 # Sulfonated kerosene (commercially available) was diluted to an organic phase containing P204=1.0±0.2mol / L. (2) The mixed rare earth solution obtained by bastnaesium and monazite mixed rare earth minerals is obtained by dissolving mixed rare earth carbonate with hydrochloric acid, and the solution contains a rare earth chloride solution of rare earth elements (REO=220 ± 20g / L), solution The ratio of the REO mass ratio of each rare earth element mass to the total rare earth element oxide REO mass in terms of oxides is: La 2 o 3 / REO=53%; CeO 2 = 15%; Pr 6 o 11 = 10%; Nd 2 o 3 = 20%; medium and heavy rare earths (calculated as oxides) = 2%. (3) Add citric acid to prepare a rare earth aqueous solution containing 0.23±0.02 mol / L citric acid and pH=1.0-2.0. (4) The separation of ...

Embodiment 3

[0036] The rare earth fluoride solution separated in this embodiment and the separation method adopted are the same as in Example 1, except that: (1) the P507 (commercially available) extractant is diluted with aviation kerosene (commercially available) to contain P507=1.5 ±0.2mol / L organic phase. (2) pH of rare earth chloride solution=1~1.5; (3) LaCePrNd and medium and heavy rare earth elements are separated in 17 stages of extraction, 13 stages of washing, and 8 stages of back extraction for NdPr and Sm (including other medium and heavy elements). rare earth element) separation; the flow ratio is: organic phase: rare earth solution: lotion=5.7:1:1.1; NdPr and CeLa are separated in a fractionation extraction tank with 51 stages of extraction, 46 stages of washing, and 8 stages of back extraction. The ratio is: organic phase: rare earth solution: lotion = 12:1:0.6; the separation of Ce and La is carried out in a fractionation extraction tank with 27 stages of extraction, 36 st...

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Abstract

The invention relates to a method for complexing, extracting and separating the rare earth element with an acid phosphate extraction agent; the point is that rare earth chloride solution is added with citric acid or salt citrate to form rare earth chloride-hydrochloric acid-citric acid mixing solution as the water phase and the P204 or P205 acid phosphate extraction agent for extraction and separation; diluted coal oil is taken as the organic phase for extraction and separation; the rare earth element is separated through processes of extraction, washing and reverse extraction in an extraction groove; the extraction residual liquid which contains the citric acid is returned for recycling. The invention is characterized in that with the complexion action of the citric acid and the rare earth element, the separation effect of the acid phosphate extraction agent on the rare earth element is enhanced and especially the rare earth element in the high-consistency rare earth solution, the REO of which equals to 200 to 300g / l can be separated; at the same time, the acid phosphate extraction agent also has comparatively high capability and effect for extracting the rare earth element without saponification process. The invention needs a small amount of investment and the production cost is low; moreover, according to the method, the environmental pollution is reduced.

Description

technical field [0001] The invention relates to a method for extracting and separating rare earth elements with an acidic phosphorus-type extractant, in particular to a method for separating a single or several groups of rare-earth elements from a chloride solution containing multiple rare-earth elements by complex extraction with an acidic phosphorus-type extractant. Background technique [0002] Rare earth elements are the general term for lanthanum and lanthanide elements, scandium and yttrium elements in the periodic table of elements. These elements have special physical and chemical properties. In the fields of metallurgy, petrochemical industry, glass ceramics and various functional materials, one or several elements are often selected as additives and necessary components. [0003] Rare earth elements coexist in natural minerals. The rare earth elements in bastnaesite, monazite and mixed rare earth minerals of bastnaesite and monazite are mainly lanthanum, cerium, p...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22B3/40C22B59/00
CPCY02P10/20
Inventor 吴文远涂赣峰边雪常宏涛
Owner NORTHEASTERN UNIV LIAONING
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