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Method for recovering rare earth and other metals from neodymium iron boron and samarium cobalt magnetic material waste

A technology for recycling NdFeB and magnetic materials, applied in the direction of improving process efficiency, etc., can solve problems such as cobalt, high concentration of ammonia nitrogen, and limited NdFeB waste, and achieve the effect of recycling waste

Inactive Publication Date: 2013-03-20
沈少波
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The above-mentioned wet process has the following deficiencies: (1) the concentration of ammonia nitrogen in the wastewater is very high, even if it is treated, it is difficult to reach the standard; (2) after the rare earth ions are precipitated with oxalic acid or ammonium bicarbonate, the solution still contains relatively high concentrations of rare earth and Toxic heavy metal cobalt; (3) The vast majority of published hydrometallurgical literature only deals with rare earth recovery, with little mention of recovery of cobalt (Co), iron (Fe), and boron (B); (4) wet process liquid The volume of the leaching agent is large, and the amount of batch NdFeB waste is very limited

Method used

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  • Method for recovering rare earth and other metals from neodymium iron boron and samarium cobalt magnetic material waste

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032]Put 300g of muddy NdFeB waste (mainly containing Nd, Dy, Fe, Co, B) into an alumina crucible, put the crucible into a box-type atmosphere furnace, and feed 500mL / min of oxygen into the furnace , the furnace temperature was raised from room temperature to 900°C, and kept at this temperature for 4 hours, then the sample was cooled to near room temperature, and the sample was taken out. Grind the roasted solid into a powder with a particle size of less than 0.1 mm, add 78 g of activated carbon powder with a particle size of less than 0.1 mm and 12 g of boron oxide powder with a particle size of less than 0.1 mm, and then add 40 ml of yeast slime aqueous solution to make the above mixed powder into many pellets with a particle size of 20 mm. After the pellets were dried at 80°C for 2 hours, they were put into a high-purity graphite crucible, and then the crucible was put into a box-type atmosphere furnace. During the whole experiment, argon gas was used as a protective atmos...

Embodiment 2

[0034] Put 300g of slimy samarium-cobalt waste (mainly containing Sm, Co, Fe) into an alumina crucible, put the crucible into a box-type atmosphere furnace, feed 500mL / min of oxygen into the furnace, and raise the furnace temperature from The room temperature was raised to 900°C and kept at this temperature for 4 hours, then the sample was cooled to near room temperature, and the sample was taken out. Grind the roasted solid into a powder with a particle size of less than 0.1 mm, add 80 g of metallurgical coke carbon powder with a particle size of less than 0.1 mm, and then add 38 ml of yeast slurry aqueous solution to make the mixed powder into many pellets with a particle size of 20 mm. After the pellets were dried at 80°C for 2 hours, they were put into a high-purity graphite crucible, and then the crucible was put into a box-type atmosphere furnace. During the whole experiment, argon gas was used as a protective atmosphere, and the furnace temperature was raised from room t...

Embodiment 3

[0036] Put 300g of muddy NdFeB waste (mainly containing Nd, Dy, Fe, Co, B) into an alumina crucible, put the crucible into a box-type atmosphere furnace, and feed 500mL / min of oxygen into the furnace , the furnace temperature was raised from room temperature to 900°C, and kept at this temperature for 4 hours, then the sample was cooled to near room temperature, and the sample was taken out. After roasting, the solid is crushed into a powder with a particle size of less than 0.1 mm, 100 g of metallurgical coke with a particle size of less than 0.1 mm is added, and then 42 ml of yeast slime aqueous solution is added to make the above mixed powder into many pellets with a particle size of 20 mm. After the pellets were dried at 80°C for 2 hours, they were put into a high-purity graphite crucible, and then the crucible was put into a box-type atmosphere furnace. During the whole experiment, argon gas was used as a protective atmosphere, and the furnace temperature was raised from ro...

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Abstract

The invention relates to a method for recovering rare earth and other metals from neodymium iron boron and samarium cobalt magnetic material waste. The method comprises the following steps of: drying and grinding the fine-particle muddy neodymium iron boron or samarium cobalt waste, and performing oxidizing roasting; grinding the obtained solid; adding carbon powder, additive powder and an adhesive and pelletizing; performing selective reduction and melting on the pellets with carbon at a high temperature to obtain a rare earth oxide slag phase 1 and a carbon-containing metal phase 1; grinding the carbon-containing metal phase 1, and performing oxidizing roasting, selective reduction and melting; and for the neodymium iron boron waste, separating to obtain a boron oxide slag phase product 2 and a Fe-Co metal phase product 2, and for samarium cobalt waste, separating to only obtain a Fe-Co metal phase product 2, wherein the rare earth oxide slag phase 1 and the Fe-Co metal phase product 2 can be used as the primary raw materials for manufacturing samarium cobalt magnet; and the rare earth oxide slag phase 1, the Fe-Co metal phase product 2 and the boron oxide slag phase product 2 can be used as the primary raw materials for manufacturing neodymium iron boron magnet.

Description

technical field [0001] The invention relates to a method for recovering rare earth and other metals in NdFeB and SmCo magnetic waste materials. Background technique [0002] The iron-based rare earth magnetic material neodymium iron boron (NdFeB) is called the "permanent magnet king", and it is widely used in various types of motors, magnetic levitation trains, nuclear magnetic resonance, IT industries, etc. In 2010, China's NdFeB magnet production has exceeded 80% of the world's total production. NdFeB magnets will produce some scraps and cutting waste during the machining process, and the loss can reach 30-40%. [0003] NdFeB magnets are sintered from metal neodymium (Nd), iron boron (Fe-B) alloy and a small amount of metal dysprosium (Dy) and metal cobalt (Co) powder. Among them, Nd and Dy account for 30-33wt.%, Fe accounts for 50-65wt.%, Co accounts for 4-6wt.%, and B accounts for 1-2wt.%. At present, almost all metals Nd and Dy use Nd in industry. 2 o 3 and Dy 2 o...

Claims

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Application Information

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IPC IPC(8): C22B7/00C22B59/00
CPCY02P10/20
Inventor 沈少波
Owner 沈少波
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