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Method for comprehensively recovering rare earth and iron from neodymium iron boron oil sludge

A NdFeB and sludge technology is applied in the field of comprehensive recovery of rare earth and iron from NdFeB sludge, which can solve the problems of polluting the environment and wasting iron resources, and achieves the effects of low oxidation roasting temperature and simple operation.

Active Publication Date: 2021-11-16
JIANGXI UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] NdFeB sludge contains 20-30% of rare earths and 60-70% of iron. It is of great significance to recover valuable metals from NdFeB sludge. In the process of waste recycling, most scholars pay attention to the selective separation and recovery of rare earths with high value, but there is little research on the iron resource which accounts for the largest proportion, resulting in the production of a large amount of iron slag or iron-containing wastewater, and direct storage or discharge not only wastes iron resources and pollute the environment

Method used

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  • Method for comprehensively recovering rare earth and iron from neodymium iron boron oil sludge
  • Method for comprehensively recovering rare earth and iron from neodymium iron boron oil sludge
  • Method for comprehensively recovering rare earth and iron from neodymium iron boron oil sludge

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0060] (1) Washing: According to the ratio of mass to volume of 1:4, stir and mix the washing powder and water to obtain detergent; according to the ratio of mass to volume of 1:4, mix NdFeB sludge with detergent, and mix it at 50 Stir at ℃ for 1.5h, filter, and repeat the operation 5 times to obtain degreased NdFeB;

[0061] (2) Roasting: put the degreased NdFeB in a muffle furnace, roast at 200°C for 2 hours, and cool to room temperature to obtain NdFeB waste;

[0062] (3) Co-leaching: According to the mass-to-volume ratio of 1:4, mix the NdFeB waste with the leaching agent, stir at 80°C for 2 hours, and filter to obtain the leaching solution and a very small amount of leaching residue; the leaching agent is hydrochloric acid, leaching The agent concentration is 4mol / L;

[0063] (4) Recovery of rare earths: According to the molar ratio of rare earth ions and oxalate radicals of 1:1, add oxalic acid into the leach solution, stir at 30°C for 2 hours, filter, and wash to obtai...

Embodiment 2

[0068] (1) Washing: According to the ratio of mass to volume of 1:8, stir and mix the washing powder and water to obtain detergent; according to the ratio of mass to volume of 1:3, mix NdFeB sludge with detergent, and mix it at 80 Stir at ℃ for 0.5h, filter, and repeat the operation 5 times to obtain degreased NdFeB;

[0069] (2) Roasting: put the degreased NdFeB in a muffle furnace, roast at 250°C for 1.5 h, and cool to room temperature to obtain NdFeB waste;

[0070] (3) Co-leaching: According to the mass-to-volume ratio of 1:5, mix the NdFeB waste with the leaching agent, stir at 98°C for 3 hours, and filter to obtain the leaching solution and a very small amount of leaching residue; the leaching agent is hydrochloric acid, leaching The agent concentration is 5mol / L;

[0071] (4) Recovery of rare earths: according to the molar ratio of rare earth ions to oxalate radicals of 1:4, add oxalic acid into the leach solution, stir at 60°C for 1.5h, filter, and wash to obtain rare...

Embodiment 3

[0076] (1) Washing: According to the ratio of mass to volume of 1:8, stir and mix the washing powder and water to obtain detergent; according to the ratio of mass to volume of 1:6, mix NdFeB sludge with detergent, and mix it at 80 Stir for 1.5h under the condition of ℃, filter, and repeat the operation 5 times to obtain degreased NdFeB;

[0077] (2) Roasting: put the degreased NdFeB in a muffle furnace, roast at 300°C for 3 hours, and cool to room temperature to obtain NdFeB waste;

[0078] (3) Co-leaching: According to the mass-to-volume ratio of 1:6, mix the NdFeB waste with the leaching agent, stir at 80°C for 4 hours, and filter to obtain the leaching solution and a very small amount of leaching residue; the leaching agent is hydrochloric acid, leaching The agent concentration is 6mol / L;

[0079] (4) Recovery of rare earths: According to the molar ratio of rare earth ions and oxalate radicals of 1:4, add oxalic acid into the leachate, stir at 30°C for 3 hours, filter, and...

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Abstract

The invention relates to the technical field of rare earth and iron recovery, in particular to a method for comprehensively recovering rare earth and iron from neodymium iron boron oil sludge. According to the method, oil in the neodymium iron boron oil sludge is removed through a detergent, then oxidizing roasting is conducted, the rare earth and the iron can be converted into corresponding oxides, it is avoided that indissolvable NdFeO3 is generated due to high-temperature roasting, hydrochloric acid is used for leaching the rare earth and the iron obtained after oxidizing roasting at the low temperature, the rare earth and the iron are almost completely dissolved, and through fractional precipitation, the rare earth and the iron are recovered by the aid of rare earth oxalate and ferrous oxalate respectively. The method has the characteristics of easiness in operation, low oxidizing roasting temperature, high rare earth and iron recovery rate and high comprehensive utilization rate of resources.

Description

technical field [0001] The invention relates to the technical field of recovery of rare earths and iron, in particular to a method for comprehensive recovery of rare earths and iron from NdFeB oil sludge. Background technique [0002] NdFeB sludge is a rare earth secondary resource, which is a waste generated during the grinding, cutting and cutting of NdFeB magnets. [0003] NdFeB sludge contains 20-30% of rare earths and 60-70% of iron. It is of great significance to recover valuable metals from NdFeB sludge. At present, in the process of recycling NdFeB waste, most scholars pay attention to the selectivity of rare earths with high value. Separation and recycling, but there is little research on iron resources, which account for the largest proportion, resulting in the production of a large amount of iron slag or iron-containing wastewater. Direct stockpiling or discharge not only wastes iron resources, but also pollutes the environment. Contents of the invention [000...

Claims

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Application Information

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IPC IPC(8): C22B7/00C21B3/04C22B1/02C22B3/10C22B3/22C22B3/44C22B59/00
CPCC22B7/006C22B1/02C22B59/00C21B3/04C22B3/10C22B3/22C22B3/44Y02W30/50Y02P10/20
Inventor 刘子帅罗仙平周贺鹏彭如振汪金良
Owner JIANGXI UNIV OF SCI & TECH
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