A method for simultaneously recovering neodymium, praseodymium, dysprosium, cobalt, and iron from NdFeB sludge under C2H2O4-OH system
A C2H2O4-OH, C2H2O4 technology, applied in the field of praseodymium, neodymium, dysprosium, iron, cobalt, can solve the problems of environmental pollution, waste of rare earth resources, etc.
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Embodiment 1
[0079] Table 1"C 2 h 2 o 4 The main chemical reactions and equilibrium constants involved in the -OH" system
[0080]
[0081]
[0082] In the theoretical part: first, consult the 2 h 2 o 4 The possible reactions of neodymium, praseodymium, dysprosium, cobalt, and iron in the -OH system and the equilibrium constants of each reaction are shown in Table 1. Established in C through chemical equilibrium, mass balance, and charge conservation 2 h 2 o 4 The thermodynamic model under the -OH system, the equation can be obtained from the ionization balance of water:
[0083] [H + ]=10 -pH (1-1)
[0084] [OH - ]=Kw*10 pH (1-2)
[0085] in C 2 h 2 o 4 In the -OH system, the concentration of free metal ions in the solution is:
[0086] [Nd 3+ ]=min{(Kspnac / [C 2 o 4 2- ] 3 ) 1 / 2 ,Kspnh / [OH - ] 3}(1-3)
[0087] [Pr 3+ ]==min{(Ksppac / [C 2 o 4 2- ] 3 ) 1 / 2 ,KsppH / [OH - ] 3}(1-4)
[0088] [Dy 3+ ]=min{(Kspdac / [C 2 o 4 2- ] 3 ) 1 / 2 ,Kspdh / [OH - ...
Embodiment 2
[0141] Table 1"C 2 h 2 o 4 The main chemical reactions and equilibrium constants involved in the -OH" system
[0142]
[0143] In the theoretical part: first, consult the 2 h 2 o 4 The possible reactions of neodymium, praseodymium, dysprosium, cobalt, and iron in the -OH system and the equilibrium constants of each reaction are shown in Table 1. Established in C through chemical equilibrium, mass balance, and charge conservation 2 h 2 o 4 The thermodynamic model under the -OH system, such as figure 1 shown. according to figure 1, it can be considered that trivalent iron ions should be selected as far as possible, and it can be seen that the optimum recovery pH value of neodymium, praseodymium and dysprosium rare earth salt should be within 0.5~2.5, and the recovery of iron and cobalt should be at a high pH value. Therefore, The patented design process is completed by adjusting the pH twice. The pH range of the optimal precipitation of neodymium, praseodymium, dys...
Embodiment 3
[0146] Table 1"C 2 h 2 o 4 The main chemical reactions and equilibrium constants involved in the -OH" system
[0147]
[0148]
[0149] In the theoretical part: first, consult the 2 h 2 o 4 The possible reactions of neodymium, praseodymium, dysprosium, cobalt, and iron in the -OH system and the equilibrium constants of each reaction are shown in Table 1. Established in C through chemical equilibrium, mass balance, and charge conservation 2 h 2 o 4 The thermodynamic model under the -OH system, such as figure 1 shown. according to figure 1 , it can be considered that trivalent iron ions should be selected as far as possible, and it can be seen that the optimum recovery pH value of neodymium, praseodymium and dysprosium rare earth salt should be within 0.5~2.5, and the recovery of iron and cobalt should be at a high pH value. Therefore, The patented design process is completed by adjusting the pH twice. The pH range of the optimal precipitation of neodymium, pras...
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