Back extraction solution prepared by extraction separation of washing organic matter of saponification wastewater by recycling rare earth and solution washing method
A rare earth extraction separation and saponification wastewater technology, which is applied in the direction of improving process efficiency, can solve the problems of increasing wastewater discharge, large new water volume, and large equipment investment, so as to reduce organic consumption, reduce resource waste, and increase rare earth yield. Effect
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Embodiment 1
[0018] The raw material is the raffinate after the separation of neodymium and samarium from the mixed rare earth chloride solution, the rare earth concentration is 1.5mol / L, pH=2, and its composition includes La 2 o 3 Content is 28.61%, CeO 2 The content is 50.46%, Pr 6 o 11 The content is 5.31%, Nd 2 o 3 The content is 15.63%; the separation scale is 12250 tons / year (calculated by rare earth oxide);
[0019] The organic phase is P 507 (diluted with kerosene), its concentration is 1.5mol / L;
[0020] La 3+ and Ce 3+ For refractory rare earth elements, Pr 3+ and Nd 3+ Easy to extract rare earth elements;
[0021] Ammonia is used as the saponification agent for the extraction and separation of cerium and praseodymium and the saponification agent for the extraction and separation of praseodymium and neodymium;
[0022] The saponification wastewater produced by the extraction and separation of praseodymium and neodymium is 174M 3 / day, the concentration of ammonium ch...
Embodiment 2
[0026] The raw material is the back-extraction solution after the mixed rare earth chloride solution is separated by gadolinium and terbium, the rare earth concentration is 1.2mol / L, pH=2, and its composition includes Tb by weight ratio 4 o 7 The content is 6.72%, Dy 2 o 3 The content is 22.52%, (Ho-Lu, Y) 2 o 3 The content is 70.76%; the separation scale is 464 tons / year (calculated by rare earth oxide);
[0027] The organic phase is P 507 (diluted with kerosene), its concentration is 1.5mol / L;
[0028] Tb 3+ and Dy 3+ Refractory rare earth elements, (Ho-Lu, Y) 3+ Easy to extract rare earth elements;
[0029] Sodium hydroxide is used as the saponification agent for the extraction and separation of dysprosium and holmium and the saponification agent for the extraction and separation of erbium and thulium;
[0030] Erbium and thulium extraction and separation to produce saponification wastewater is 9.25M 3 / day, the sodium chloride concentration in the waste water is...
Embodiment 3
[0034] The raw material is a mixed rare earth chloride solution, the rare earth concentration is 1.5mol / L, pH=2, and its composition is by weight ratio La 2 o 3 -Nd 2 o 3 Content is 98%, Sm 2 o 3 -Lu 2 o 3 and Y 2 o 3 The content is 2%; the separation scale is 12,500 tons / year (calculated as rare earth oxides)
[0035] The organic phase is P 507 (diluted with kerosene), its concentration is 1.5mol / L;
[0036] La 3+ -Nd 3+ For refractory rare earth elements, Sm 3+ -Lu 3+ and Y 3+ Easy to extract rare earth elements;
[0037] Ammonium bicarbonate solution is used as the saponification agent for the extraction and separation of neodymium and samarium, and ammonia water is used as the saponification agent for the extraction and separation of praseodymium and neodymium;
[0038] The saponification wastewater produced by the extraction and separation of praseodymium and neodymium is 174M 3 / day, the concentration of ammonium chloride in the waste water is 2.6mol / L; ...
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