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Novel method for recycling rare earth from neodymium iron boron recycled material

A technology of neodymium iron boron and recycled materials, applied in the direction of improving process efficiency, etc., can solve problems such as high requirements for equipment materials, polluting the environment, and difficult disposal, and achieve the effect of simple process, high rare earth leaching rate, and efficient recovery

Pending Publication Date: 2022-06-03
SICHUAN PROVINCE LESHAN CITY RUIFENG METALLURGY CO LTD
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  • Description
  • Claims
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Problems solved by technology

[0005] Aiming at the problems in the prior art that NdFeB wastes are difficult to deal with due to their different forms, the existing recycling methods pollute the environment, have high costs, have high requirements for equipment and materials, and have a long process, the present invention provides a kind of NdFeB waste from NdFeB. A New Method for Recovering Rare Earth from Boron Recycling Material

Method used

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  • Novel method for recycling rare earth from neodymium iron boron recycled material

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0040] A new method for recovering rare earth from neodymium iron boron recycled material, comprising the following steps:

[0041] Step 1: Mixing: fully mix the NdFeB wastes in the form of powder, granular, block, mud, etc. to obtain NdFeB wastes that are dry and wet evenly and are convenient for abrasive sample preparation;

[0042] Step 2: Grinding and sample preparation: Weigh 500 g of the NdFeB waste obtained in Step 1 and add it to the sample preparation machine for grinding to obtain NdFeB waste powder;

[0043] Step 3: sieving and slurrying: sieve the NdFeB waste powder obtained in step 2 with a 200-mesh sample to obtain the oversize and undersize, and detect the content of rare earth and iron in the undersize. The rare earth content is 26%, and the iron content is 67%. Put the material on the sieve into the sample making machine to continue grinding, weigh 200g of the material under the sieve, and add 350ml of water to make it into a slurry;

[0044] Step 4: Leaching...

Embodiment 2

[0049] Step 1: Mixing: fully mix the NdFeB wastes in the form of powder, granular, block, mud, etc. to obtain NdFeB wastes that are dry and wet evenly and are convenient for abrasive sample preparation;

[0050] Step 2: Grinding and sample preparation: Weigh 500 g of the NdFeB waste obtained in Step 1 and add it to the sample preparation machine for grinding to obtain NdFeB waste powder;

[0051] Step 3: sieving and slurrying: sieve the NdFeB waste powder obtained in step 2 with a 200-mesh sample to obtain the oversize and undersize, and detect the content of rare earth and iron in the undersize. The rare earth content is 28%, and the iron content is 65%. Put the material on the sieve into the sample making machine to continue grinding, weigh 200g of the material under the sieve, and add 380ml of water to make it into a slurry;

[0052] Step 4: Leaching: slowly add 140 ml of hydrochloric acid with a concentration of 30% to the slurry obtained in step 3, and then slowly add 160...

Embodiment 3

[0057] Step 1: Mixing: fully mix the NdFeB wastes in the form of powder, granular, block, mud, etc. to obtain NdFeB wastes that are dry and wet evenly and are convenient for abrasive sample preparation;

[0058] Step 2: Grinding and sample preparation: Weigh 500 g of the NdFeB waste obtained in Step 1 and add it to the sample preparation machine for grinding to obtain NdFeB waste powder;

[0059] Step 3: sieving and slurrying: sieve the NdFeB waste powder obtained in step 2 with a 200-mesh sample to obtain the oversize and undersize, and detect the content of rare earth and iron in the undersize. The rare earth content is 30%, and the iron content is 66%. Put the material on the sieve into the sample making machine to continue grinding, weigh 200g of the material under the sieve, and add 400ml of water to make it into a slurry;

[0060] Step 4: Leaching: slowly add 150 ml of hydrochloric acid with a concentration of 30% to the slurry obtained in step 3, and then slowly add 172...

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Abstract

The invention belongs to the technical field of rare earth recovery and extraction, and particularly relates to a novel method for recovering rare earth from a neodymium iron boron reclaimed material. The method comprises the following steps: preparing neodymium-iron-boron waste into neodymium-iron-boron waste powder, sieving the neodymium-iron-boron waste powder, blending the neodymium-iron-boron waste powder into slurry, adding quantitative hydrochloric acid to dissolve the neodymium-iron-boron reclaimed material, adding a transforming agent to enable rare earth in the neodymium-iron-boron reclaimed material to be dissolved into feed liquid and iron and boron to be left in slag, heating to 85-90 DEG C after the reaction is completed, and carrying out solid-liquid separation to obtain neodymium-iron-boron powder; the pH is adjusted back to 3.0-3.5 through a pH adjusting agent, impurity ions are removed, the reaction continues for 10-15 minutes, then a flocculating agent is added for flocculation and clarification, material liquid and material residues containing rare earth are obtained after the step of filtering and residue washing, and the material liquid is used for extraction and separation to obtain single rare earth oxide. The hydrochloric acid and the transforming agent are used as leaching agents to selectively leach the rare earth, so that the rare earth is dissolved in feed liquid, iron and boron are left in slag and are not dissolved, the yield of the rare earth is 98.6% or above, and efficient recovery of the valuable rare earth in the neodymium iron boron waste is achieved.

Description

technical field [0001] The invention belongs to the technical field of rare earth recovery and extraction, and in particular relates to a new method for recovering rare earth from neodymium iron boron recycled materials. Background technique [0002] NdFeB permanent magnets have excellent performance, and high-performance NdFeB permanent magnet materials are widely used in high-tech fields such as computers, motors, and MRI machines. The production process of NdFeB permanent magnet materials is relatively mature, but there are still certain problems. During the production process of NdFeB, due to equipment and process reasons, wastes that account for about 25% of the raw materials will be generated, and the mass fraction of rare earth components will be generated. About 35% of the rare earth resources are non-renewable. The use of economical and effective processes to recycle valuable rare earths in NdFeB waste can create certain economic value, save resources and reduce env...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22B7/00C22B59/00C22B1/00
CPCC22B7/007C22B59/00C22B1/005Y02P10/20
Inventor 朱光荣许思玉张荣冯新瑞吴仕伦
Owner SICHUAN PROVINCE LESHAN CITY RUIFENG METALLURGY CO LTD
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