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Method for recovering Nd (neodymium), Pr (praseodymium), Dy (dysprosium), Co (cobalt) and Fe (iron) simultaneously from NdFeB (neodymium iron boron) oil sludge under C2H2O4-NH3 system

A C2H2O4-NH3, NdFeB technology, applied in the direction of process efficiency improvement, etc., can solve the waste of rare earth resources, environmental pollution and other problems

Active Publication Date: 2014-03-26
BEIJING UNIV OF TECH
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  • Summary
  • 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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  • Method for recovering Nd (neodymium), Pr (praseodymium), Dy (dysprosium), Co (cobalt) and Fe (iron) simultaneously from NdFeB (neodymium iron boron) oil sludge under C2H2O4-NH3 system
  • Method for recovering Nd (neodymium), Pr (praseodymium), Dy (dysprosium), Co (cobalt) and Fe (iron) simultaneously from NdFeB (neodymium iron boron) oil sludge under C2H2O4-NH3 system
  • Method for recovering Nd (neodymium), Pr (praseodymium), Dy (dysprosium), Co (cobalt) and Fe (iron) simultaneously from NdFeB (neodymium iron boron) oil sludge under C2H2O4-NH3 system

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0089] Table 1"C 2 h 2 o 4 The main chemical reactions and equilibrium constants involved in the -NH3" system

[0090] No.

Reactions

logK

No.

Reactions

logK

1

h 2 O=H + +OH —

logK w =-14

25

Fe 2+ +4OH — =Fe(OH) 4 2—

logK f2h4 =18.58

2

co 2+ +OH — =Co(OH) +

logK ch1 =3.3

26

Fe 3+ +OH — =Fe(OH) 2+

logK f3h1 =11.87

3

co 2+ +2OH — =Co(OH) 2 0

logK ch2 =9.2

27

Fe 3+ +2OH — =Fe(OH) 2 +

logK f3h2 =21.17

4

co 2+ +3OH — =Co(OH) 3 -

logK ch3 =10.5

28

Fe 3+ +3OH — =Fe(OH) 3 0

logK f3h3 =29.67

5

co 2+ +4OH — =Co(OH) 4 2-

logK ch4 =10.2

29

co 2+ +NH 3 =Co(NH 3 ) 2+

logK cam11 =2.11

6

2Co 2+ +OH — =Co 2 (OH) 3+

logK ch21 =2.7

30

co 2+ +2NH 3 =Co(NH 3 ) 2 2+

logK cam12 =3.74

7

4C...

Embodiment 2

[0162] Table 1"C 2 h 2 o 4 The main chemical reactions and equilibrium constants involved in the -NH3" system

[0163]

[0164]

[0165] In the theoretical part: first, consult the 2 h 2 o 4 -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 C through chemical equilibrium, mass balance, and charge conservation 2 h 2 o 4 -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 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 neodymiu...

Embodiment 3

[0168] Table 1"C 2 h 2 o 4 The main chemical reactions and equilibrium constants involved in the -NH3" system

[0169]

[0170]

[0171] In the theoretical part: first, consult the 2 h 2 o 4 -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 C through chemical equilibrium, mass balance, and charge conservation 2 h 2 o 4 -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 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 neodymiu...

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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 C2H2O4-NH3 system and belongs to the technical field of recovery of NdFeB oil sludge. By thermodynamic study and simulation of the C2H2O4-NH3 system, a thermodynamic model is built, and applicable technologies and technological parameters are determined. In addition, the pH is adjusted and selected twice to be in a range of (0.5-2.5)-9 under the C2H2O4-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 99%, 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 79%, 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 C 2 h 2 o 4 -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 streng...

Claims

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Application Information

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IPC IPC(8): C22B7/00C22B3/44C22B59/00C22B23/00
CPCY02P10/20
Inventor 刘敏赖伟鸿李春燕尹小文金琼花岳明索红莉
Owner BEIJING UNIV OF TECH
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