Simple and convenient chemical industry method for extracting and recovering cobalt from waste neodymium-iron-boron magnetic material

An industrial method and NdFeB 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 recovery costs

Inactive Publication Date: 2015-05-06
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 cobalt element, the cobalt element extraction link of the above-mentioned several process schemes all comes from the residual liquid and raffinate of the precipitation or extraction process. From the perspective of the process route, the cobalt element extraction link is at the end of the process step. 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 cobalt 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 convenient chemical industry method for extracting and recovering cobalt from waste neodymium-iron-boron magnetic material
  • Simple and convenient chemical industry method for extracting and recovering cobalt from waste neodymium-iron-boron magnetic material
  • Simple and convenient chemical industry method for extracting and recovering cobalt from waste neodymium-iron-boron magnetic material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0059] Take a batch of scraps from the machining process of NdFeB permanent magnet materials. After testing, the above-mentioned metal elements in each 100g of NdFeB scrap include: 32.10g of rare earth elements (the main component is Nd, including Pr, Dy, Gd), 61.22g of Fe element content, 3.56g of cobalt element content, Al The element content is 0.43g.

[0060] Take 1000Kg of the above-mentioned batch of NdFeB waste materials, grind and pulverize them through a ball mill until the average particle size is below 200 mesh, and oxidize and roast the pulverized materials in a rotary kiln (calcination temperature 700 ° C, roasting time 1.5 hours), and then The oxidized and roasted material is leached with 4N hydrochloric acid (leaching temperature is 85°C, and the pH value of the leaching end point is controlled to be 1.0). According to the process statistics, the consumption in Yancheng is about 1.38 cubic meters.

[0061] The Yourong leachate was detected, and its main compon...

Embodiment 2

[0072] Take another part of the excellent solvent leaching solution in Example 1, and perform extraction to remove iron and extract cobalt according to method 2 (co-extraction).

[0073] Add sodium chlorate solution to the above-mentioned excellent solution leaching solution, so that the Fe in the leaching solution 2+ converted to Fe 3+ . According to the process statistics, the dosage of sodium chlorate is 3.58Kg (33.63mol); the calculation shows that the theoretical amount of sodium chlorate water required for the complete oxidation of divalent Fe elements in the above-mentioned excellent solution leachate to trivalent Fe elements is 31.73mol; The actual amount is 106% of the theoretical equivalent value.

[0074] Add 30L of 4N hydrochloric acid and 130Kg of NaCl (solid) to the water phase of the leaching solution after extraction and iron removal, and after fully mixing, measure the [H + ]=0.25mol / L, [Cl - ]=236g / L.

[0075] Take the extracted solution as the water pha...

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Abstract

The invention discloses a simple and convenient chemical industry method for extracting and recovering cobalt from a waste neodymium-iron-boron magnetic material. The method comprises the steps of material oxidation, optimal dissolution leaching, extraction iron removal, extraction cobalt collection, cobalt recovery and compound preparation. The method disclosed by the invention combines a domestic rare earth recovery process which is generally adopted in the current neodymium-iron-boron waste material comprehensive utilization industry in China, and uses the characteristic that an amine extractant does not react with rare earth ions, and iron ions and cobalt ions are separated from a leachate by using the amine extractant before extraction of rare earth according to a 'less extraction and more residues' manner, so that the aim of recovering cobalt is achieved. On the basis of the technical scheme of the invention, the extraction iron removal and extraction cobalt collection adopt a consistent extraction system, the flow joint is reasonable, the process is simple, and the operation in the production process is convenient.

Description

technical field [0001] The invention belongs to the technical field of comprehensive utilization of waste resources, and in particular relates to a simple industrial method for extracting and recovering cobalt element from NdFeB magnetic material 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 cobalt in NdFeB magnetic materials helps to weaken the main phase Nd 2 Fe 14 The magnetic coupling effect of ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22B7/00C22B23/00C22B59/00
CPCY02P10/20
Inventor 梁浩梁健
Owner LIANYUNGANG ZHAOYU NEW MATERIAL IND
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