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A method for synchronously and efficiently extracting rare earth and iron from high-value recycled NdFeB waste

A neodymium-iron-boron, high-value technology, applied in the field of industrial waste recycling, can solve the problems of neglecting the recycling of abundant iron elements, difficult to achieve high-value utilization of iron resources, and low rare earth yield, etc., and achieve high-efficiency extraction and high-value recycling. , environmentally friendly, and the effect of a short extraction process

Active Publication Date: 2021-02-26
赣州稀土友力科技开发有限公司
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, based on this method, the process of treating NdFeB waste needs to complete the leaching and recycling of rare earths step by step. Although this method can obtain rare earth oxides with high purity, the entire recovery process has a long process and low yield of rare earths. However, most of the current treatment processes still only focus on the recovery of rare earth elements in waste, while ignoring the recycling of the rich iron elements in NdFeB waste (iron in NdFeB waste accounts for about 60%-70%) , usually the iron slag after leaching is only treated as iron-making raw material, and it is difficult to realize high-value utilization of iron resources

Method used

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  • A method for synchronously and efficiently extracting rare earth and iron from high-value recycled NdFeB waste
  • A method for synchronously and efficiently extracting rare earth and iron from high-value recycled NdFeB waste
  • A method for synchronously and efficiently extracting rare earth and iron from high-value recycled NdFeB waste

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Effect test

Embodiment 1

[0033] The method for synchronously and efficiently extracting rare earth and iron in high-value recycling NdFeB waste described in this embodiment includes the following steps:

[0034] (1) Take the NdFeB waste and send it to the roaster, and oxidize and roast it at 950°C for 1.5 hours to obtain a mixed oxide mainly composed of iron and rare earth, grind it until the particle size is 300 mesh, and set it aside;

[0035] (2) Take 5 g of the above-mentioned mixed oxide and oxalic acid solution with a concentration of 0.75 mol / L to react in a beaker for 2 hours according to a solid-liquid ratio of 1:50 (g / mL) to obtain a solid-liquid mixture, and set a constant temperature stirrer during the process The temperature is 90°C, and the rotation speed is 400r / min; the obtained solid-liquid mixture is filtered and separated to obtain the leachate containing iron oxalate and the solid precipitate mainly composed of rare earth oxalate;

[0036] (3) Add iron powder 2.55g in the leachate ...

Embodiment 2

[0043] The method for synchronously and efficiently extracting rare earth and iron in high-value recycling NdFeB waste described in this embodiment includes the following steps:

[0044] (1) Take the NdFeB waste material and send it to a roasting furnace, and carry out oxidation roasting at a temperature of 700 ° C for 3 hours to obtain a mixed oxide mainly composed of iron and rare earth, which is ground to a particle size of 300 mesh, and then used for later use;

[0045](2) Take 5 g of the above-mentioned mixed oxide and oxalic acid solution with a concentration of 0.5 mol / L and react in a beaker for 3 hours according to a solid-liquid ratio of 1:60 (g / mL) to obtain a solid-liquid mixture, and set a constant temperature stirrer during the process The temperature is 80°C, and the rotation speed is 400r / min; the obtained solid-liquid mixture is filtered and separated to obtain the leachate containing iron oxalate and the solid precipitate mainly composed of rare earth oxalate;...

Embodiment 3

[0053] The method for synchronously and efficiently extracting rare earth and iron in high-value recycling NdFeB waste described in this embodiment includes the following steps:

[0054] (1) Take the NdFeB waste and send it to the roaster, and oxidize and roast it at 1200 ° C for 1 hour to obtain a mixed oxide mainly composed of iron and rare earth, grind it until the particle size is 300 mesh, and set it aside;

[0055] (2) Take 5 g of the above-mentioned mixed oxide and oxalic acid solution with a concentration of 1.25 mol / L and react in a beaker for 1 hour according to the solid-liquid ratio of 1:40 (g / mL) to obtain a solid-liquid mixture. The temperature is 100°C, and the rotation speed is 400r / min; the obtained solid-liquid mixture is filtered and separated to obtain the leachate containing ferric oxalate and the solid precipitate mainly composed of rare earth oxalate;

[0056] (3) Add iron powder 2.55g in the leaching liquid that step (2) obtains, add constant temperatur...

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Abstract

The invention belongs to the technical field of industrial waste recycling and specifically relates to a method for synchronously and efficiently extracting high-value rare earth and iron from NdFeB waste for reuse. The method of the present invention reacts the oxidation product obtained after oxidizing and roasting the NdFeB waste with the oxalic acid solution to obtain the leach solution containing iron oxalate and the solid precipitate mainly composed of rare earth oxalate, and then only the leach solution and the precipitate Iron reduction and molten salt electrolysis treatment can be carried out respectively to obtain rare earth alloys for the production of NdFeB materials and ferrous oxalate for the production of lithium battery materials. The method only uses oxalic acid solution as a leaching agent and a precipitating agent, and can complete the leaching of iron and the transformation of rare earths in one step, thereby achieving the purpose of simultaneously realizing the efficient extraction and high-value recycling of iron and rare earths. The method of the invention has a short extraction process, is environmentally friendly, can effectively recover and obtain high-value products, and has extremely high process operability.

Description

technical field [0001] The invention belongs to the technical field of industrial waste recycling, in particular to a method for synchronously and efficiently extracting rare earth and iron from high-value recycled NdFeB waste. Background technique [0002] NdFeB permanent magnet materials have developed rapidly in recent years because of their light weight, small size, strong magnetism, high magnetic energy product, easy access to raw materials, and cheap prices. They are the most cost-effective magnets so far. Known as the "Magnetic King", it is widely used in electronics, electric machinery, medical equipment, toys, packaging, hardware machinery, aerospace and other fields. The more common ones are permanent magnet motors, speakers, magnetic separators, computer disk drives, and magnetic resonance imaging. Equipment meters, etc. [0003] my country is a big producer of NdFeB magnetic materials. At present, the annual output of NdFeB is still growing at a rate of about 20...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C25C3/36C22B7/00C22B59/00C22B1/02C07C51/41C07C55/07
CPCC07C51/412C22B1/02C22B7/007C22B59/00C25C3/36C07C55/07Y02P10/20
Inventor 刘庆生钟春明曹蒙
Owner 赣州稀土友力科技开发有限公司
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