A method for simultaneously recovering neodymium, praseodymium, dysprosium, cobalt, and iron from NdFeB sludge under nh3-oh system

A technology of NH3-OH and NdFeB, which is applied in the fields of cobalt, praseodymium, iron, dysprosium, and neodymium extraction, which can solve problems such as environmental pollution and waste of rare earth resources

Active Publication Date: 2016-06-01
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 nh3-oh system
  • A method for simultaneously recovering neodymium, praseodymium, dysprosium, cobalt, and iron from NdFeB sludge under nh3-oh system
  • A method for simultaneously recovering neodymium, praseodymium, dysprosium, cobalt, and iron from NdFeB sludge under nh3-oh system

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0062] Table 1 "NH 3 The main chemical reactions and equilibrium constants involved in the -OH" system

[0063] 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 2+ +OH — =Fe(OH) +

logK f2h1 =5.56

29

Co 2+ +4NH 3 =Co(NH 3 ) 4 2+

logK cam14 =5.55

9

Fe 2+ +2OH — =Fe(OH) 2 0

logK f2h2 =9.77

30

Co 2+ +5NH 3 =Co(NH...

Embodiment 2

[0110] Table 2 "NH 3 The main chemical reactions and equilibrium constants involved in the -OH" system

[0111] 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

6 --> 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 2+ +OH — =Fe(OH) +

logK f2h1 =5.56

29

Co 2+ +4NH 3 =Co(NH 3 ) 4 2+

logK cam14 =5.55

9

Fe 2+ +2OH — =Fe(OH) 2 0

logK f2h2 =9.77

30

Co 2+ +5NH 3...

Embodiment 3

[0115] Table 3 "NH 3 The main chemical reactions and equilibrium constants involved in the -OH" system

[0116]

[0117]

[0118] In the theoretical part: First, check the OH-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. Based on OH-NH through chemical balance, mass balance, and charge conservation 3 The thermodynamic model under the system can be programmed by MATLAB to get the values ​​of [Nd], [Pr], [Dy], [Fe2], [Fe3], [Co] at different pH values, so as to establish a thermodynamic model, 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 6-10, and the combined precipitation of neodymium, praseodymium, dysprosium, cobalt, and iron can be obtained through a on...

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PUM

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Abstract

The invention discloses a method for synchronously recycling neodymium, praseodymium, dysprosium, cobalt and iron from neodymium-iron-boron oil sludge in an NH3-OH system, belonging to the technical field of neodymium-iron-boron oil sludge recycling. The method comprises the steps of establishing a thermodynamic model through thermodynamic study and simulation of an OH-NH3 system, and determining appropriate technology and technological parameters; adjusting the pH value to 8-9 in the OH-NH3 system and performing 'cooperation-precipitation' to realize an effect of synchronously recycling neodymium, praseodymium, dysprosium, cobalt and iron. The flow can effectively shorten the early process exploration, is simple to operate and concise in process, effectively reduces waste discharge, and realizes complete recycling of neodymium, praseodymium, dysprosium, cobalt and iron in the neodymium-iron-boron oil sludge, wherein the recycle rate of neodymium is greater than or equal to 99%, the recycle rate of praseodymium is greater than or equal to 99%, the recycle rate of cobalt is greater than or equal to 93%, the recycle rate of dysprosium is greater than or equal to 99%, and the recycle rate of iron is greater than or equal to 99%.

Description

Technical field [0001] The present invention relates to a 3 A method for extracting neodymium, praseodymium, dysprosium, cobalt and iron from neodymium iron boron sludge under the -OH system belongs to the technical field of neodymium iron boron sludge recovery. Background technique [0002] Since the discovery of the (third generation) rare earth permanent magnet alloys with neodymium iron boron as the matrix in 1983 by Japanese and American scientists almost at the same time, its huge magnetic energy product has refreshed the existing permanent magnet material record, causing a huge world permanent magnet material market The change. The domestic development of NdFeB is very fast, and the annual production capacity of nearly 100 enterprises across the country has reached nearly 100,000 tons. As we all know, in the production process of NdFeB materials, there are many leftovers, defective products and cut scraps, and the total loss is as high as 30%. Therefore, it is important t...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22B7/00C22B59/00C22B23/00C21B15/00
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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