Looking for breakthrough ideas for innovation challenges? Try Patsnap Eureka!

A method for simultaneously recovering neodymium, praseodymium, dysprosium, cobalt, and iron from NdFeB sludge under C2H2O4-OH system

A C2H2O4-OH, C2H2O4 technology, applied in the field of praseodymium, neodymium, dysprosium, iron, cobalt, can solve the problems of environmental pollution, waste of rare earth resources, etc.

Active Publication Date: 2016-05-18
宁波智合志远企业管理合伙企业(有限合伙)
View PDF7 Cites 0 Cited by
  • 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

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • A method for simultaneously recovering neodymium, praseodymium, dysprosium, cobalt, and iron from NdFeB sludge under C2H2O4-OH system
  • A method for simultaneously recovering neodymium, praseodymium, dysprosium, cobalt, and iron from NdFeB sludge under C2H2O4-OH system
  • A method for simultaneously recovering neodymium, praseodymium, dysprosium, cobalt, and iron from NdFeB sludge under C2H2O4-OH system

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0079] Table 1"C 2 h 2 o 4 The main chemical reactions and equilibrium constants involved in the -OH" system

[0080]

[0081]

[0082] In the theoretical part: first, consult the 2 h 2 o 4 The possible reactions of neodymium, praseodymium, dysprosium, cobalt, and iron in the -OH 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 The thermodynamic model under the -OH system, the equation can be obtained from the ionization balance of water:

[0083] [H + ]=10 -pH (1-1)

[0084] [OH - ]=Kw*10 pH (1-2)

[0085] in C 2 h 2 o 4 In the -OH system, the concentration of free metal ions in the solution is:

[0086] [Nd 3+ ]=min{(Kspnac / [C 2 o 4 2- ] 3 ) 1 / 2 ,Kspnh / [OH - ] 3}(1-3)

[0087] [Pr 3+ ]==min{(Ksppac / [C 2 o 4 2- ] 3 ) 1 / 2 ,KsppH / [OH - ] 3}(1-4)

[0088] [Dy 3+ ]=min{(Kspdac / [C 2 o 4 2- ] 3 ) 1 / 2 ,Kspdh / [OH - ...

Embodiment 2

[0141] Table 1"C 2 h 2 o 4 The main chemical reactions and equilibrium constants involved in the -OH" system

[0142]

[0143] In the theoretical part: first, consult the 2 h 2 o 4 The possible reactions of neodymium, praseodymium, dysprosium, cobalt, and iron in the -OH 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 The thermodynamic model under the -OH 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 neodymium, praseodymium, dys...

Embodiment 3

[0146] Table 1"C 2 h 2 o 4 The main chemical reactions and equilibrium constants involved in the -OH" system

[0147]

[0148]

[0149] In the theoretical part: first, consult the 2 h 2 o 4 The possible reactions of neodymium, praseodymium, dysprosium, cobalt, and iron in the -OH 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 The thermodynamic model under the -OH 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 neodymium, pras...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

No PUM Login to View More

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-OH system and belongs to the technical field of recovery of NdFeB oil sludge. By thermodynamic study and simulation of the C2H2O4-OH 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 (0.5-1)-9 under the C2H2O4-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 99%, 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 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, i...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
Patent Type & Authority Patents(China)
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 宁波智合志远企业管理合伙企业(有限合伙)
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Patsnap Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Patsnap Eureka Blog
Learn More
PatSnap group products

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic, Popular Technical Reports.

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap|About US| Contact US: help@patsnap.com