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Simple and convenientindustrial method for recovering Co element from NdFeBmagnetwaste materials

An industrial method, neodymium-iron-boron technology, applied in the field of comprehensive utilization of waste resources, can solve the problems of difficulty in reflecting economic benefits, combining together, and high recycling costs

Active Publication Date: 2015-04-01
LIANYUNGANG ZHAOYU NEW MATERIAL IND
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0010] Focusing on the recovery of Co element, the Co element extraction link of the above-mentioned several process schemes all comes from the raffinate and raffinate of the precipitation or extraction process. From the perspective of the process route, the Co element extraction link is at the end of the process steps. Therefore, there are disadvantages such as lengthy process, high recycling cost, and difficulty in reflecting economic benefits.
It is also because of this that the various technical solutions for the recovery of Co elements in the above-mentioned NdFeB waste have not been truly integrated with the rare earth element recovery industry.

Method used

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  • Simple and convenientindustrial method for recovering Co element from NdFeBmagnetwaste materials
  • Simple and convenientindustrial method for recovering Co element from NdFeBmagnetwaste materials
  • Simple and convenientindustrial method for recovering Co element from NdFeBmagnetwaste materials

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0066] Take a batch of scraps from the machining process of NdFeB permanent magnet materials. After testing, the above-mentioned metal elements in every 100g of NdFeB scrap include: 31.03g of rare earth elements (the main component is Nd, including Pr, Dy, Gd), 60.01g of Fe element content, 4.36g of Co element content, Al Element content 0.40g.

[0067] Take 1000Kg of the above-mentioned batch of NdFeB waste materials, grind and pulverize them through a ball mill to an average particle size of less than 300 mesh, and oxidize and roast the pulverized materials in a rotary kiln (calcination temperature 700 ° C, roasting time 1 hour), and then The oxidized and roasted material is leached with 2.7N concentration of hydrochloric acid (leaching temperature is 85°C, and the pH value of the leaching end point is controlled to be 2.0). According to process statistics, the consumption in Yancheng is about 1.8 cubic meters.

[0068] The Yourong leachate was tested, and the content of C...

Embodiment 2

[0076] Take another part of Yourong leachate in Example 1, and carry out oxidative hydrolysis according to the two-step process.

[0077] Firstly, sodium chlorate is used as the oxidizing agent for primary oxidation hydrolysis, and the Yourong leachate is heated to 90°C, and sodium chlorate solution is continuously added to it, and after the precipitation begins to appear, the speed of adding the sodium chlorate solution is slowed down; Sampling and analysis is carried out when the precipitate is precipitated. When the residual concentration of Fe in the liquid phase system of the leach solution is controlled below 0.2mg / L, the reaction is stopped, and pressure filtration is carried out immediately for separation to obtain the leachate after the primary oxidation hydrolysis and the primary oxidation precipitation residue. According to the process statistics, the amount of sodium chlorate used is 7.10Kg (66.67mol); the calculation shows that the theoretical equivalent of sodium ...

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Abstract

The invention discloses a simple and convenientindustrial method for recovering the Co element from NdFeBmagnetwaste materials. The simple and convenientindustrial method comprises the steps as follows: material oxidation, preferential dissolution leaching, oxidation hydrolysis, Co element recovery, compound preparation and the like. According to the technical route design, the variable valence characteristic of the Co element and stability difference of bivalent Co and trivalent Co are combined skillfully. According to the method, flow matching and technology integration between the Co recovery process link and the conventional rare earth recovery assembly line in the domestic NdFeBwaste material recovery industry can be realized; in the aspect of technical target, the same principle is followed, the Co element is effectively entrapped and recovered at the front end of the whole flow based on the process steps includingmaterial oxidation, preferential dissolution leaching and oxidation hydrolysis, meanwhile, interference of a leachatesystemby Fe and Co elements in the follow-up procedure is avoided, and a rare earth extraction separation process is realized.

Description

technical field [0001] The invention belongs to the technical field of comprehensive utilization of waste resources, relates to rare earth resource recovery and utilization technology, and in particular to a simplified method for pretreatment-acid leaching of NdFeB waste. Background technique [0002] NdFeB permanent magnet material (NdFeB) is the most powerful permanent magnet material discovered in 1982 so far. It has been widely used in computers, medical equipment, communication devices, electronic devices, magnetic machinery and other fields. At present, the domestic NdFeB industry has reached an annual scale of 100,000 tons and is still growing. In terms of chemical composition, about 30% of NdFeB magnetic materials are rare earth elements (more than 90% of which are Nd), 65-69% are Fe elements, and 1.1-1.2% B elements. A large number of studies have shown that the addition of Co elements in NdFeB magnetic materials helps to weaken the main phase Nd 2 Fe 14 The magn...

Claims

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Application Information

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IPC IPC(8): C22B7/00C22B23/00
CPCY02P10/20
Inventor 梁浩梁健
Owner LIANYUNGANG ZHAOYU NEW MATERIAL IND
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