A method for simultaneously recovering neodymium, praseodymium, dysprosium, cobalt, and iron from NdFeB sludge under CO3-NH3 system
A CO3-NH3, NdFeB technology, applied in the field of praseodymium, iron, dysprosium, cobalt, and neodymium extraction, can solve the problems of environmental pollution, waste of rare earth resources, etc.
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Embodiment 1
[0075] Table 1 "CO 3 -NH 3 "The main chemical reactions and equilibrium constants involved in the system
[0076] No. Reactions logK No. Reactions logK 1 h 2 O=H + +OH — logK w =-14 22 Fe 2+ +4OH — =Fe(OH) 4 2— logK f2h4 =18.58 2 co 2+ +OH — =Co(OH) + logK ch1 =3.3 23 Fe 3+ +OH — =Fe(OH) 2+ logK f3h1 =11.87 3 co 2+ +2OH — =Co(OH) 2 0 logK ch2 =9.2 24 Fe 3+ +2OH — =Fe(OH) 2 + logK f3h2 =21.17 4 co 2+ +3OH — =Co(OH) 3 - logK ch3 =10.5 25 Fe 3+ +3OH — =Fe(OH) 3 0 logK f3h3 =29.67 5 co 2+ +4OH — =Co(OH) 4 2- logK ch4 =10.2 26 co 2+ +NH 3 =Co(NH 3 ) 2+ logK cam11 =2.11 6 2Co 2+ +OH — =Co 2 (OH) 3+ logK ch21 =2.7 27 co 2+ +2NH 3 =Co(NH 3 ) 2 2+ logK cam12 =3.74 7 4Co 2+ +4OH — =Co 4 (OH) 4 4+ logK ch44 =25.6 28 co 2+ +3NH 3 =Co(NH 3 ) 3 2+ logK cam13 =4.79 8 F...
Embodiment 2
[0135] Table 1 "CO 3 -NH 3 "The main chemical reactions and equilibrium constants involved in the system
[0136] No. Reactions logK No. Reactions logK 1 h 2 O=H + +OH — logK w =-14 22 Fe 2+ +4OH — =Fe(OH) 4 2— logK f2h4 =18.58 2 co 2+ +OH — =Co(OH) + logK ch1 =3.3 23 Fe 3+ +OH — =Fe(OH) 2+ logK f3h1 =11.87 3 co 2+ +2OH — =Co(OH) 2 0 logK ch2 =9.2 24 Fe 3+ +2OH — =Fe(OH) 2 + logK f3h2 =21.17 4 co 2+ +3OH — =Co(OH) 3 - logK ch3 =10.5 25 Fe 3+ +3OH — =Fe(OH) 3 0 logK f3h3 =29.67 5 co 2+ +4OH — =Co(OH) 4 2- logK ch4 =10.2 26 co 2+ +NH 3 =Co(NH 3 ) 2+ logK cam11 =2.11 6 2Co 2+ +OH — =Co 2 (OH) 3+ logK ch21 =2.7 27 co 2+ +2NH 3 =Co(NH 3 ) 2 2+ logK cam12 =3.74 7 4Co 2+ +4OH — =Co 4 (OH) 4 4+ logK ch44 =25.6 28 co 2+ +3NH 3 =Co(NH 3 ) 3 2+ logK cam13 =4.79 8 Fe ...
Embodiment 3
[0140] Table 1 "CO 3 -NH 3 "The main chemical reactions and equilibrium constants involved in the system
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[0142]
[0143] In the theoretical part: first, consult the 3 -NH 3 The possible reactions of neodymium, praseodymium, dysprosium, cobalt, and iron in the system and the equilibrium constants of each reaction are shown in Table 1. Established in CO by chemical balance, mass balance, and charge conservation 3 -NH 3 The thermodynamic model under the system, such as figure 1 shown. according to figure 1 , it can be considered that trivalent iron ions should be selected as much as possible, and the pH range of the optimal precipitation of neodymium, praseodymium, dysprosium, cobalt, and iron should be within 3 to 7, and the complex precipitation of neodymium, praseodymium, dysprosium, cobalt, and iron can be obtained by one-step process product.
[0144] In the experimental part: take five parts of 5g NdFeB sludge for distillation pretreatment, respect...
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