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Method for preparing magnesium-neodymium master alloy by using neodymium-iron-boron magnet waste

The technology of magnesium-neodymium master alloy and NdFeB is applied in the fields of preparing magnesium-neodymium master alloy and rare earth resource recycling, which can solve the problems of high energy consumption and cost, and high price of rare-earth-containing magnesium alloy, so as to widen the recovery ways and reduce the Cost, simple process and stable effect

Active Publication Date: 2016-01-13
SHANGHAI JIAOTONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Due to the high energy consumption and cost of preparing traditional Mg-RE master alloys, the price of magnesium alloys containing rare earths is also high

Method used

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  • Method for preparing magnesium-neodymium master alloy by using neodymium-iron-boron magnet waste

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] This embodiment relates to the direct preparation of Mg-Nd master alloys by using NdFeB industrial waste as raw material and adopting the process of diffusion reduction in high-temperature Mg liquid. The preparation process mainly includes the following three steps:

[0025] ①Pretreatment of NdFeB waste (cleaning and crushing). In order to remove the oil and dirt on the surface of NdFeB industrial waste, first put the waste block into a strong alkali solution tank (NaOH or KOH) and stir it for a certain cleaning effect, and soak it for 24 hours to clean thoroughly, and then rinse it repeatedly with clean water for 3 to 4 hours. Dry the water in an oven at 100-200°C; then use a pulverizer to crush the waste and sieve it to about 30-100 mesh or finer.

[0026] ②Diffusion reaction of NdFeB waste powder with high temperature pure Mg solution. According to a certain material ratio (mass ratio of NdFeB waste to magnesium liquid), here refers to NdFeB / Mg=0.25, slowly add NdFeB...

Embodiment 2～15

[0031] Embodiments 2 to 15 also relate to the direct preparation of Mg-Nd master alloys by using NdFeB industrial waste as raw material and adopting the process of diffusion reduction in high-temperature Mg liquid. The difference between the preparation method and Example 1 is that the temperature of the magnesium solution, the waste NdFeB:Mg material ratio (mass ratio), and the resting time after stirring are shown in Table 1 respectively. The Nd content of the prepared Mg-Nd is collected, the Nd recovery rate is shown in Table 1, the content of impurity elements Fe+B<1%, and there is no obvious oxidation inclusion.

[0032] Table 1

[0033]

[0034] Combining Table 1 and a large number of experiments show that: when the material ratio NdFeB / Mg=0.25~2.0 range, that is, when the Nd element addition amount is 7.0%~38%, (0.25×0.3 / (0.25×0.3+1)=7%, 2.0× 0.3 / (2.0×0.3+1)=38%), the Nd content of the prepared Mg-Nd alloy is in the range of 3%-21%, and the Nd recovery rate can be a...

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Abstract

The invention discloses a method for preparing a magnesium-neodymium intermediate alloy by adopting a neodymium-iron-boron waste magnet material. The method comprises the following steps: dispersing and reducing in a high-temperature magnesium liquid by taking the neodymium-iron-boron waste magnet material as a raw material; and pouring a solution at an upper middle part to an ingot mould so as to obtain the magnesium-neodymium intermediate alloy. The method disclosed by the invention is simple in process and low in production cost and widens the recovery mode of the NdFeB waste material. According to the invention, the Nd content of the prepared Mg-Nd intermediate alloy is about 3%-21% according to different material ratios, the Nd recovery rate is as high as 60%-70%, and the Nd recovery rate can be further enhanced by about 10% after a lower fusant is recycled; and the impurity elements Fe+B achieve the content less than 1% without obvious oxide inclusions, can be taken as the Nd intermediate alloy of a rare-earth magnesium alloy industry and reduces the cost of a rare-earth magnesium alloy. In addition, the process can also be taken as a low-cost method for adding an Nd element to the rare-earth magnesium alloy.

Description

technical field [0001] The invention belongs to the technical field of metal materials, and relates to a rare earth resource recycling technology, in particular to a method for preparing a magnesium-neodymium master alloy by adopting neodymium-iron-boron magnet waste. Background technique [0002] Since Sagawa invented sintered neodymium-iron-boron (NdFeB) magnets in 1983, it has been hailed as the king of magnetism in the field of magnetism because of its light weight, high remanence and coercive force, and the largest magnetic energy product. As the most cost-effective magnet so far, it has been widely used in power generation equipment, electrical equipment, home appliances, electrical appliances, hard disk drives, nuclear magnetic resonance instruments, communication equipment and many other fields. China has been researching and developing rare earth permanent magnet materials for decades, and now it has accounted for nearly 80% of the global market share. There are mor...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C1/02C22C23/06C22C1/03
Inventor 孙明彭立明胡小禹付彭怀彭颖红丁文江
Owner SHANGHAI JIAOTONG UNIV
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