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Method for recovering mixed rare earth chlorides from neodymium iron boron permanent magnet material scraps

A technology of rare earth chlorides and permanent magnet materials, applied in rare earth metal compounds, chemical instruments and methods, iron halides, etc., can solve the problems of large consumption of chemical raw materials, high production costs, and many solid and liquid wastes, and achieve reduction Emissions, Effects of Reducing Species and Quantities

Inactive Publication Date: 2010-09-01
SHENYANG POLYTECHNIC UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] The invention provides a method for recovering mixed rare earth chlorides from NdFeB permanent magnet material waste, the purpose of which is to solve the problem of large consumption of chemical raw materials, high production costs, many solid and liquid wastes, and environmental pollution in the previous recovery process problems in other aspects

Method used

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  • Method for recovering mixed rare earth chlorides from neodymium iron boron permanent magnet material scraps
  • Method for recovering mixed rare earth chlorides from neodymium iron boron permanent magnet material scraps
  • Method for recovering mixed rare earth chlorides from neodymium iron boron permanent magnet material scraps

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Embodiment 1

[0028] A method for recovering mixed rare earth chlorides from NdFeB permanent magnet material waste, characterized in that: the method is carried out according to the following steps:

[0029] (1) Waste gas recovery: 100g of NdFeB permanent magnet material waste is ground into a 200-mesh powder material in an inert gas environment, and 8g of carbon powder is mixed into the powder material (the weight ratio of waste material to carbon powder is 1: 0.08), Place in a tubular quartz reactor and pass dry chlorine gas at 450°C for 2.5 hours for chlorination reaction to generate carbon dioxide, rare earth chlorides such as rare earth neodymium, terbium, dysprosium, ferric chloride and other chloride mixtures; Absorb the carbon dioxide and excess chlorine generated by the reaction with ammonia water to obtain a mixture of ammonium bicarbonate and ammonium chloride that can be reused after concentration and crystallization;

[0030] (2) Recovery of mixed rare earth chlorides: the rare...

Embodiment 2

[0036] A method for recovering mixed rare earth chlorides from NdFeB permanent magnet material waste, characterized in that: the method is carried out according to the following steps:

[0037] (1) Waste gas recovery: Grind 100g of NdFeB permanent magnet material waste into a 200-mesh powder material in an inert gas environment, and mix 10g of carbon powder into the powder material (the weight ratio of waste material to carbon powder is 1: 0.1), Place in a tubular quartz reactor and pass dry chlorine gas at 500°C for 2.5 hours for chlorination reaction to generate carbon dioxide, rare earth chlorides such as rare earth neodymium, terbium, dysprosium, ferric chloride and other chloride mixtures; Absorb the carbon dioxide and excess chlorine generated by the reaction with ammonia water to obtain a mixture of ammonium bicarbonate and ammonium chloride that can be reused after concentration and crystallization;

[0038] (2) Recovery of mixed rare earth chlorides: the rare earth ch...

Embodiment 3

[0044] A method for recovering mixed rare earth chlorides from NdFeB permanent magnet material waste, characterized in that: the method is carried out according to the following steps:

[0045] (1) Recovery of waste gas: 100g of NdFeB permanent magnet material waste is ground into 400 mesh powder material in an inert gas environment, and 10g of carbon powder is mixed into the powder material (the weight ratio of waste material to carbon powder is 1: 0.1), Place in a tubular quartz reactor and pass dry chlorine gas at 450°C for 2.5 hours for chlorination reaction to generate carbon dioxide, rare earth chlorides such as rare earth neodymium, terbium, dysprosium, ferric chloride and other chloride mixtures; Absorb the carbon dioxide and excess chlorine generated by the reaction with ammonia water to obtain a mixture of ammonium bicarbonate and ammonium chloride that can be reused after concentration and crystallization;

[0046] (2) Recovery of mixed rare earth chlorides: the rar...

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Abstract

The invention provides a method for recovering mixed rare earth chlorides from neodymium iron boron permanent magnet material scraps, which is characterized in that: grinding the neodymium iron boron permanent magnet material scraps in an environment of an inert gas to obtain a powdered material, adding a proper amount of carbon powder into the powdered material, introducing a dry chlorine gas into the mixed powder to perform chlorination and performing two closed-tube chemical vapor transport processes for the chlorinated product to obtain the mixed rare earth chlorides which contain over 95 percent of rare earth and anhydrous ferric chloride with a purity of about 98 percent respectively; and using oxalate to perform precipitation and obtaining cobalt oxide with a purity of about 99 percent by washing, dehydration and roasting. When the method is used for recovering the mixed rare earth chlorides and valuable elements such as iron and cobalt from the neodymium iron boron permanent magnet material scraps, the varieties and using amount of chemical raw materials can be reduced in a recovery process, the discharge of waste gases and water can be reduced, and the waste gases can be absorbed by ammonia water so as to be reused.

Description

1. Technical field: [0001] The invention belongs to the technical field of resource recovery and reuse, and mainly relates to a method for recovering rare earth valuable elements and their chlorides from waste materials of NdFeB permanent magnet materials, in particular to a method for recycling NdFeB permanent magnet material waste materials A method for recovering mixed rare earth chlorides. 2. Background technology: [0002] Due to the excellent properties of rare earth permanent magnet materials, they are widely used in various fields such as electronic technology, communications, micro motors, aviation instruments, and medical equipment. As the third-generation rare earth permanent magnet material, NdFeB has the characteristics of small size, light weight and strong magnetism. With the rapid development of my country in the field of information, automobiles and other high-tech fields, it has brought broad market prospects to the NdFeB permanent magnet material industry...

Claims

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Application Information

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IPC IPC(8): C01F17/00C01C1/16C01C1/26C01G49/10C01G51/04
Inventor 于锦徐炳辉高勇
Owner SHENYANG POLYTECHNIC UNIV
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