Method for recovering rare earth elements from waste neodymium iron boron leftover material

A technology for corner waste and rare earth elements, which is applied in the field of rare earth resource recovery and recycling, can solve the problems of high consumption of inert gas and energy, inability to continuous production, long operation cycle, etc., and achieve the effect of reducing labor intensity and fully oxidizing roasting. , the effect of shortening the operation cycle

Inactive Publication Date: 2011-08-17
LIANYUNGANG ZHAOYU NEW MATERIAL IND
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AI Technical Summary

Problems solved by technology

Its purpose is to solve the problems of large inert gas and energy consumption, high risk factor in operation and control process, long operation cycle, environmental pollution and inability to continue production in the previous NdFeB recycling pretreatment process.

Method used

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Effect test

Embodiment

[0023] 5000Kg of NdFeB scraps from Zhejiang Shenghua Strong Magnetic Materials Co., Ltd. were shredded by a shredder, and the weight of the cut pieces was controlled to be below 100g / piece. The shredded NdFeB waste fragments are introduced into the first cylinder section of the 4-tube internal heating self-ignition rotary kiln (diameter 3000mm) in a continuous feeding manner, and the continuous feeding speed of the NdFeB waste fragments is every 30 Once every minute, 200Kg / h each time, the initial temperature of the first cylinder section is set to 700°C, and the induced air volume of the first cylinder section is 2500m 3 / h, keep the temperature at the first barrel section of the rotary kiln at 700°C ± 30°C, and control the residence time of the NdFeB waste at the first barrel section to 30 minutes; sampling inspection shows that the iron element in the NdFeB waste has 92 % converted to the combined state of ferric iron.

[0024] After meeting the 30-minute residence time, t...

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Abstract

The invention discloses a method for recovering rare earth elements from a waste neodymium iron boron leftover material, comprising the following steps: cutting the waste neodymium iron boron leftover material into small pieces; then, introducing the small pieces into the first cylinder ring part of an internal-heating spontaneous-combustion rotary kiln with multiple cylinder rings through a continuous feeding mode; and controlling the internal temperature, the induced air amount, the material dwell time and the like of the first cylinder ring and the rest cylinder ring positions so as to fully oxidize and roast the waste neodymium iron boron material; and leaching the preprocessed material with hydrochloric acid, comprehensively decontaminating, carrying out extraction separation, precipitating and roasting to obtain rare earth oxide. According to the method, harm and pollution on on-site operation personnel and peripheral environment by raised dust and micro powder in the original preprocessing link can be avoided, inert gas consumption is avoided, coal and electricity power consumption can be drastically reduced, labor intensity is greatly lowered, an operation period is greatly shortened, and the requirement of continuous production can be satisfied.

Description

technical field [0001] The invention relates to the technical field of recovery and recycling of rare earth resources, in particular to a method for recovering rare earth elements from NdFeB scraps. Background technique [0002] NdFeB permanent magnet is a kind of permanent magnet material with superior performance. Since it came out in 1983, it has stood out from many permanent magnet materials and has been widely used in various high-tech fields. Because NdFeB permanent magnet materials have high remanence, high coercive force, and high energy product, they have become the best among permanent magnet materials and are recognized as the "magnet king". In recent years, the output of sintered NdFeB in China has grown at a rate of 35%. It is estimated that the output of NdFeB in my country in 2010 has exceeded 100,000 tons. [0003] In the process of producing NdFeB permanent magnet components, it must be machined and made into rectangular, square, round, inner and outer roun...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22B7/00C22B1/02C22B3/10C22B59/00
CPCY02P10/20
Inventor 梁浩
Owner LIANYUNGANG ZHAOYU NEW MATERIAL IND
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