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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.

Active Publication Date: 2016-01-06
宁波智合志远企业管理合伙企业(有限合伙)
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Therefore, this method is not only a great waste of rare earth resources, but also causes huge pollution to the local environment

Method used

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  • A method for simultaneously recovering neodymium, praseodymium, dysprosium, cobalt, and iron from NdFeB sludge under CO3-NH3 system
  • A method for simultaneously recovering neodymium, praseodymium, dysprosium, cobalt, and iron from NdFeB sludge under CO3-NH3 system
  • A method for simultaneously recovering neodymium, praseodymium, dysprosium, cobalt, and iron from NdFeB sludge under CO3-NH3 system

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Experimental program
Comparison scheme
Effect test

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

[0141]

[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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Abstract

The invention discloses a method for recovering Nd (neodymium), Pr (praseodymium), Dy (dysprosium), Co (cobalt) and Fe (iron) simultaneously from NdFeB (neodymium iron boron) oil sludge under a CO3-NH3 system and belongs to the technical field of recovery of NdFeB oil sludge. By thermodynamic study and simulation of the CO3-NH3 system, a thermodynamic model is built, and applicable technologies and technological parameters are determined. In addition, the pH is adjusted to be in a range of 6-7 under the specific CO3-NH3 system so as to perform 'compounding-sedimentation', and the effect of simultaneous recovery of the Nd, the Pr, the Dy, the Co and the Fe can be realized. According to the method, early technological explorations can be effectively shortened, the method is simple to operate and concise in technology, waste discharge can be effectively reduced, and total recovery of the Nd, the Pr, the Dy, the Co and the Fe in the NdFeB oil sludge can be realized. According to the method, the recovery rate of the Nd is higher than or equal to 98%, the recovery rate of the Pr is higher than or equal to 99%, the recovery rate of the Co is higher than or equal to 58%, the recovery rate of the Dy is higher than or equal to 99%, and the recovery rate of the Fe is higher than or equal to 99%.

Description

technical field [0001] The present invention relates to a CO 3 -NH 3 The method for extracting neodymium, praseodymium, dysprosium, cobalt and iron from NdFeB sludge under a system belongs to the technical field of NdFeB sludge recovery. Background technique [0002] Since Japanese and American scientists discovered the (third-generation) rare earth permanent magnet alloy based on NdFeB almost simultaneously in 1983, its huge magnetic energy product has refreshed the existing permanent magnet material record, causing a huge market for permanent magnet materials in the world. The change. The domestic development of NdFeB is very fast, and the annual production capacity of nearly 100 enterprises in the country has reached nearly 100,000 tons. As we all know, in the production process of NdFeB materials, there are many scraps, defective products and scraps from cutting and grinding, and the total loss is as high as more than 30%. Therefore, it is important to strengthen the ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22B7/00C22B1/00C22B3/06C22B23/00C22B59/00
CPCY02P10/20
Inventor 刘敏赖伟鸿李春燕尹小文金琼花岳明索红莉
Owner 宁波智合志远企业管理合伙企业(有限合伙)
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