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

A CO3-OH, NdFeB technology, applied in the field of praseodymium, cobalt, dysprosium, iron, and extraction of neodymium, can solve the problems of waste of rare earth resources and environmental pollution

Active Publication Date: 2016-06-29
赣州兮泓永磁技术有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

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

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0071] Table 1 "CO 3 The main chemical reactions and equilibrium constants involved in the -OH" system

[0072] No.

Reactions

logK

No.

Reactions

logK

1

h 2 O=H + +OH —

logK w =-14

16

Nd+OH — =Nd(OH) 2+

logK nh =5.5

2

co 2+ +OH — =Co(OH) +

logK ch1 =3.3

17

Pr+OH — =Pr(OH) 2+

logK pH =4.3

3

co 2+ +2OH — =Co(OH) 2 0

logK ch2 =9.2

18

Dy+OH — =Dy(OH) 2+

logK dh =5.2

4

co 2+ +3OH — =Co(OH) 3 —

logK ch3 =10.5

19

Co(OH) 2 (s)=Co 2+ +2OH —

logKspch=-14.23

5

co 2+ +4OH — =Co(OH) 4 2-

logK ch4 =10.2

20

Fe(OH) 2 (s)=Fe 2+ +2OH —

logKspf2h=-16.31

6

2Co 2+ +OH — =Co 2 (OH) 3+

logK ch21 =2.7

21

Fe(OH) 3 (s)=Fe 3+ +3OH —

logKspf3h=-38.55

7

4Co 2+ +4OH — =Co 4 (OH) 4 4+

logK ch44 =25.6

2...

Embodiment 2

[0127] Table 1 "CO 3 The main chemical reactions and equilibrium constants involved in the -OH" system

[0128] No.

Reactions

logK

No.

Reactions

logK

1

h 2 O=H + +OH —

logK w =-14

15

Nd+OH — =Nd(OH) 2+

logK nh =5.5

2

co 2+ +OH — =Co(OH) +

logK ch1 =3.3

16

Pr+OH — =Pr(OH) 2+

logK pH =4.3

[0129] 3

co 2+ +2OH — =Co(OH) 2 0

logK ch2 =9.2

17

Dy+OH — =Dy(OH) 2+

logK dh =5.2

4

co 2+ +3OH — =Co(OH) 3 —

logK ch3 =10.5

18

Co(OH) 2 (s)=Co 2+ +2OH —

logKspch=-14.23

5

co 2+ +4OH — =Co(OH) 4 2-

logK ch4 =10.2

19

Fe(OH) 2 (s)=Fe 2+ +2OH —

logKspf2h=-16.31

6

2Co 2+ +OH — =Co 2 (OH) 3+

logK ch21 =2.7

20

Fe(OH) 3 (s)=Fe 3+ +3OH —

logKspf3h=-38.55

6 --> 7

4Co 2+ +4OH — =Co 4 (OH) 4 4+

...

Embodiment 3

[0133] Table 1 "CO 3 The main chemical reactions and equilibrium constants involved in the -OH" system

[0134] No.

Reactions

logK

No.

Reactions

logK

1

h 2 O=H + +OH —

logK w =-14

16

Nd+OH — =Nd(OH) 2+

logK nh =5.5

2

co 2+ +OH — =Co(OH) +

logK ch1 =3.3

17

Pr+OH — =Pr(OH) 2+

logK p H=4.3

3

co 2+ +2OH — =Co(OH) 2 0

logK ch2 =9.2

18

Dy+OH — =Dy(OH) 2+

logK dh =5.2

4

co 2+ +3OH — =Co(OH) 3 —

logK ch3 =10.5

19

Co(OH) 2 (s)=Co 2+ +2OH —

logKspch=-14.23

5

co 2+ +4OH — =Co(OH) 4 2-

logK ch4 =10.2

20

Fe(OH) 2 (s)=Fe 2+ +2OH —

logKspf2h=-16.31

6

2Co 2+ +OH — =Co 2 (OH) 3+

logK ch21 =2.7

21

Fe(OH) 3 (s)=Fe 3+ +3OH —

logKspf3h=-38.55

7

4Co 2+ +4OH — =Co 4 (OH) 4 4+

logK ch44 =25.6

2...

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PUM

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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-OH system and belongs to the technical field of recovery of NdFeB oil sludge. By thermodynamic study and simulation of the CO3-OH 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 CO3-OH 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 89%, 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 The invention discloses a method for extracting neodymium, praseodymium, dysprosium, cobalt and iron from NdFeB sludge under the -OH system, belonging 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 impo...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22B7/00C22B23/00C22B59/00C21B15/00
CPCY02P10/20
Inventor 刘敏赖伟鸿李春燕尹小文金琼花岳明索红莉
Owner 赣州兮泓永磁技术有限公司
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