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Method for synchronously and efficiently extracting high-value recycled rare earth and iron in neodymium-iron-boron waste

A neodymium iron boron and waste technology is applied in the field of industrial waste recycling, which can solve the problems of neglecting the regeneration and utilization of abundant iron elements, difficult to realize high-value utilization of iron resources, and low rare earth yield, etc., and achieves high-efficiency extraction and high-value reuse. Environmentally friendly, short extraction process

Active Publication Date: 2019-12-24
赣州稀土友力科技开发有限公司
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  • Summary
  • 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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  • Method for synchronously and efficiently extracting high-value recycled rare earth and iron in neodymium-iron-boron waste
  • Method for synchronously and efficiently extracting high-value recycled rare earth and iron in neodymium-iron-boron waste
  • Method for synchronously and efficiently extracting high-value recycled rare earth and iron in neodymium-iron-boron 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 recycling of industrial waste, and particularly relates to a method for synchronously and efficiently extracting high-value recycled rare earth and ironfrom neodymium-iron-boron waste. According to the method, an oxidation product obtained after the neodymium-iron-boron waste is subjected to oxidative roasting is reacted with an oxalic acid solution, a leaching solution containing ferric oxalate and a solid precipitate mainly contains oxalic acid rare earth can be obtained, then iron reduction and molten salt electrolysis treatment are carried out only on the leaching solution and the precipitate respectively, and rare earth alloy for producing neodymium-iron-boron materials and ferrous oxalate used in the lithium battery material productioncan be obtained. According to the method, only the oxalic acid solution is used as a leaching agent and a precipitant, and leaching of iron and transformation of rare earth can be completed in one step, so that the purpose of synchronous realization of efficient extraction and high-value reuse of iron and rare earth is achieved, in the case of the method, the extraction process is short, the environment-friendly effect is achieved, high-value products can be effectively recovered and obtained, and extremely high process operability is achieved.

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 Applications(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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