Separation method for co-producing pure neodymium and pure lutetium by fractional extraction
A separation method and extraction technology, which is applied in the field of preparation of 4N-grade neodymium chloride and 5N-grade lutetium chloride by the fractional distillation extraction method, can solve the problems of high product qualification rate, low product qualification rate, poor process stability, etc., and achieve the degree of greening High efficiency, reduced alkali consumption, and improved pass rate
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[0030] Example 1
[0031] The saponified P229 organic phase is the extractant P229 in the kerosene solution. The volume percentage of P229 in the kerosene solution is 30%, and the saponification rate is 36%.
[0032] The pH of the 2N grade neodymium chloride solution is 3, and the concentrations of rare earth elements are: La 0.030g / L, Ce 0.10g / L, Pr0.50g / L, Nd 140.0g / L, Sm 0.050g / L, Eu 0.030g / L, Gd 0.010g / L.
[0033] The pH of 2N grade lutetium chloride solution is 3, and the concentration of rare earth elements are: Er 0.003g / L, Tm 0.20g / L, Yb 0.50g / L, Lu 165.0g / L, Ti 0.060g / L, Th 0.060g / L.
[0034] Step 1: Fractional extraction and separation of LaCePrNd / NdSmEuGd
[0035] Saponified P229 organic phase is used as the extraction organic, 2N grade neodymium chloride solution is the first feed liquid, and 3.0mol / L HCl is the washing acid. The saponified P229 organic phase enters the LaCePrNd / NdSmEuGd fractionation extraction system from the first stage, the first feed liquid enters ...
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[0049] Example 2
[0050] The saponified P229 organic phase is the extractant P229 in the kerosene solution. The volume percentage of P229 in the kerosene solution is 30%, and the saponification rate is 36%.
[0051] The pH of 2N grade neodymium chloride solution is 4, and the concentrations of rare earth elements are: La 0.050g / L, Ce 0.020g / L, Pr1.0g / L, Nd 135.0g / L, Sm 0.10g / L, Eu 0.050g / L, Gd 0.030g / L.
[0052] The pH of 2N grade lutetium chloride solution is 2, and the concentration of rare earth elements are respectively: Er 0.0050g / L, Tm 0.50g / L, Yb1.0g / L, Lu 170.0g / L, Ti 0.10g / L, Th 0.10g / L.
[0053] Step 1: Fractional extraction and separation of LaCePrNd / NdSmEuGd
[0054] Saponified P229 organic phase is used as the extraction organic, 2N grade neodymium chloride solution is the first feed liquid, and 3.0mol / L HCl is the washing acid. The saponified P229 organic phase enters the LaCePrNd / NdSmEuGd fractionation extraction system from the first stage, the first feed liquid en...
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[0068] Example 3
[0069] The saponified P229 organic phase is the extractant P229 in the kerosene solution. The volume percentage of P229 in the kerosene solution is 30%, and the saponification rate is 36%.
[0070] The pH of 2N grade neodymium chloride solution is 2, and the concentrations of rare earth elements are: La 0.010g / L, Ce 0.050g / L, Pr0.20g / L, Nd 145.0g / L, Sm 0.020g / L, Eu 0.010g / L, Gd 0.005g / L.
[0071] The pH of the 2N grade lutetium chloride solution is 4, and the concentrations of rare earth elements are: Er 0.001g / L, Tm 0.050g / L, Yb0.10g / L, Lu 160.0g / L, Ti 0.030g / L, Th 0.030g / L.
[0072] Step 1: Fractional extraction and separation of LaCePrNd / NdSmEuGd
[0073] Saponified P229 organic phase is used as the extraction organic, 2N grade neodymium chloride solution is the first feed liquid, and 3.0mol / L HCl is the washing acid. The saponified P229 organic phase enters the LaCePrNd / NdSmEuGd fractionation extraction system from the first stage, the first feed liquid enter...
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