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
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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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