Method for extracting rare earth from oxidized neodymium iron boron waste

A neodymium iron boron and rare earth chloride technology, applied in the field of rare earth resource recovery and recycling, can solve the problems of low recycling rate, large amount of liquid waste, low quality of rare earth products, etc., and achieves reduced labor intensity and operation cycle. The effect of shortening, efficiency and productivity improvement

Inactive Publication Date: 2012-10-10
赣州市永莱宝高新材料有限公司
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[0007] The purpose of the present invention is to provide a method for extracting rare earths from oxidized NdFeB waste. Therefore, it provides a production method for recovering praseodymium neodymium oxide, dysprosium oxide, terbium oxide, holmium oxide, and gadolinium oxide from neodymium boron waste as raw materials

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  • Method for extracting rare earth from oxidized neodymium iron boron waste

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[0034] Such as figure 1 A method for extracting rare earths from oxidized NdFeB waste is shown. The steps are as follows: 1) Ball milling: mix the NdFeB waste with water and perform ball milling, and strictly control the particle size of the mud produced after ball milling , the particle size range is 90-200 mesh; its purpose is to increase the degree of oxidation of ferrous salts and improve the recovery efficiency of rare earths. During the ball milling, the ratio of waste material to water is controlled at 2:3, and the positive and negative error does not exceed 10%; the purpose is to improve the efficiency of ball milling, help to control the particle size of materials, and increase the degree of oxidation of ferrous salt and improve recovery. efficiency. The water used for ball milling is deionized pure water, the purpose of which is to reduce non-rare earth impurities in the product, such as Ca 2+ ,Mg 2+ , Si, Mn, B - etc., so that the content of non-rare earth impur...

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Abstract

The invention discloses a method for extracting rare earth from oxidized neodymium iron boron waste. The method comprises the following steps of: mixing the neodymium iron boron waste with water and then grinding; oxidizing the ground neodymium iron boron waste; performing primary grinding of the oxidation product; adding acid and leaching; separating solid from liquid; extracting to remove iron; chloridizing rare earth; extracting and separating rare earth; extracting to remove aluminum; precipitating; and firing. By adopting the method disclosed by the invention to recover the rare earth, the rare earth recovery rate is increased by 5-8%; and moreover, the use value of the recovered rare earth is increased, the production cost of further processing is lowered, the problem of muddy objects of the molten salt when in single rare earth electrolysis is effectively solved, the electrolysis efficiency when in the electrolysis of the rare earth metal is improved, the power consumption can be effectively reduced, and the content of the non-rare earth elements in metal such as C, S, O and the like is reduced.

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 extracting rare earths from oxidized NdFeB waste. 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". my country has initially formed its own industrial system in the production of NdFeB permanent magnet materials, and its output accounts for about 45% of the global total. 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 excee...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22B7/00C22B1/02C22B3/10C22B3/20C22B59/00
CPCY02P10/20
Inventor 杨剑
Owner 赣州市永莱宝高新材料有限公司
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