Corrosion-resistant neodymium-iron-boron permanent magnet material and preparation method thereof

Abstract

The invention discloses a corrosion-resistant neodymium-iron-boron permanent magnet material and a preparation method thereof. The corrosion-resistant neodymium-iron-boron permanent magnet material comprises the following components in percentage by weight: 20-26 percent of Nd, 5-6.5 percent of Pr, 1-4 percent of B, 0.05-0.065 percent of Ir, 0.05-0.065 percent of Os, 0.5-0.65 percent of Sc, 0.5-0.65 percent of Cu and the balance of Fe. The corrosion-resistant neodymium-iron-boron permanent magnet material disclosed by the invention is provided with uniform tissue and a robust structure, so that the corrosion resistance of the material can be enhanced, and the magnetic performance is improved. According to the preparation method of the corrosion-resistant neodymium-iron-boron permanent magnet material, raw materials of an alloy are directly produced by fully utilizing praseodymium and neodymium waste, a component mixture ratio is flexible, and the quality is controlled appropriately; and moreover, the cost can be reduced, a process is simple, and powder waste with high oxygen content is fully utilized.

Description

technical field

[0001] The invention belongs to the field of functional materials, and relates to a corrosion-resistant NdFeB permanent magnet material and a preparation method. Background technique

[0002] CN200910241836.X discloses a method for recovering rare earth elements from NdFeB waste, the implementation steps are as follows: a. Add water to the NdFeB waste; b. Grinding the prepared raw materials and filtering the mud formed after grinding; c. Oxidizing and roasting the filtered mud; d. Secondary grinding of the oxidized roasted product; e. acid leaching the secondary ground product; f. Carrying out solid-liquid separation on the product leached by adding acid, and extracting and removing iron from the separated material-liquid to form rare earth chloride; g. Use P507 kerosene-hydrochloric acid separation system to extract and separate rare earth chloride; h. In the separated rare earth chloride, the praseodymium and neodymium chloride are extracted to remove...

Examples

Embodiment 1

[0028] Prepare corrosion-resistant NdFeB permanent magnet materials according to the following steps:

[0029] 1) Treatment of praseodymium and neodymium waste: mix praseodymium and neodymium waste in hydrochloric acid with a mass concentration of 25%, the mass ratio of praseodymium and neodymium waste to hydrochloric acid is 1:2.0, then add oxalic acid to the hydrochloric acid mixture and stir evenly, the oxalic acid and hydrochloric acid mixture The weight ratio was 2.5:1. The precipitate collected after 1 hour was dried at a temperature of 120° C. for 1 hour, and then kept at a temperature of 1050° C. for 1.5 hours to obtain a precipitated rare earth oxide.

[0030] 2) Grinding ingredients: determine the content of Nd, Pr and Sc in the precipitated rare earth oxide, add praseodymium oxide powder, neodymium oxide powder and scandium oxide powder to the precipitated rare earth oxide after the measurement to adjust the composition, and the adjusted precipitate rare earth oxide ...

Embodiment 2

[0036] Prepare corrosion-resistant NdFeB permanent magnet materials according to the following steps:

[0037] 1) Treatment of praseodymium and neodymium waste: mix praseodymium and neodymium waste in hydrochloric acid with a mass concentration of 30%, the mass ratio of praseodymium and neodymium waste to hydrochloric acid is 1:2.0, then add oxalic acid to the hydrochloric acid mixture and stir evenly, the oxalic acid and hydrochloric acid mixture The weight ratio is 2.5:1. The precipitate collected after 1.5 hours was dried at 120°C for 1 hour, and then kept at 1100°C for 1 hour to obtain the precipitated rare earth oxide.

[0038] 2) Grinding ingredients: determine the content of Nd, Pr and Sc in the precipitated rare earth oxide, add praseodymium oxide powder, neodymium oxide powder and scandium oxide powder to the precipitated rare earth oxide after the measurement to adjust the composition, and the adjusted precipitate rare earth oxide The weight ratio of Nd:Pr:Sc in the ...

Embodiment 3

[0044] When preparing the magnetic alloy ingot in step 4), the ingredients are distributed according to the following weight percentages: Nd 20.8%, Pr 5.2%, B 3%, Ir 0.053%, Os 0.053%, Sc 0.52%, Cu 0.6%, and the rest is Fe.

[0045] All the other processes are the same as in embodiment one.

technical field

[0001] The invention belongs to the field of functional materials, and relates to a corrosion-resistant NdFeB permanent magnet material and a preparation method. Background technique

[0002] CN200910241836.X discloses a method for recovering rare earth elements from NdFeB waste, the implementation steps are as follows: a. Add water to the NdFeB waste; b. Grinding the prepared raw materials and filtering the mud formed after grinding; c. Oxidizing and roasting the filtered mud; d. Secondary grinding of the oxidized roasted product; e. acid leaching the secondary ground product; f. Carrying out solid-liquid separation on the product leached by adding acid, and extracting and removing iron from the separated material-liquid to form rare earth chloride; g. Use P507 kerosene-hydrochloric acid separation system to extract and separate rare earth chloride; h. In the separated rare earth chloride, the praseodymium and neodymium chloride are extracted to remove...

Examples

Embodiment 1

[0028] Prepare corrosion-resistant NdFeB permanent magnet materials according to the following steps:

[0029] 1) Treatment of praseodymium and neodymium waste: mix praseodymium and neodymium waste in hydrochloric acid with a mass concentration of 25%, the mass ratio of praseodymium and neodymium waste to hydrochloric acid is 1:2.0, then add oxalic acid to the hydrochloric acid mixture and stir evenly, the oxalic acid and hydrochloric acid mixture The weight ratio was 2.5:1. The precipitate collected after 1 hour was dried at a temperature of 120° C. for 1 hour, and then kept at a temperature of 1050° C. for 1.5 hours to obtain a precipitated rare earth oxide.

[0030] 2) Grinding ingredients: determine the content of Nd, Pr and Sc in the precipitated rare earth oxide, add praseodymium oxide powder, neodymium oxide powder and scandium oxide powder to the precipitated rare earth oxide after the measurement to adjust the composition, and the adjusted precipitate rare earth oxide ...

Embodiment 2

[0036] Prepare corrosion-resistant NdFeB permanent magnet materials according to the following steps:

[0037] 1) Treatment of praseodymium and neodymium waste: mix praseodymium and neodymium waste in hydrochloric acid with a mass concentration of 30%, the mass ratio of praseodymium and neodymium waste to hydrochloric acid is 1:2.0, then add oxalic acid to the hydrochloric acid mixture and stir evenly, the oxalic acid and hydrochloric acid mixture The weight ratio is 2.5:1. The precipitate collected after 1.5 hours was dried at 120°C for 1 hour, and then kept at 1100°C for 1 hour to obtain the precipitated rare earth oxide.

[0038] 2) Grinding ingredients: determine the content of Nd, Pr and Sc in the precipitated rare earth oxide, add praseodymium oxide powder, neodymium oxide powder and scandium oxide powder to the precipitated rare earth oxide after the measurement to adjust the composition, and the adjusted precipitate rare earth oxide The weight ratio of Nd:Pr:Sc in the ...

Embodiment 3

[0044] When preparing the magnetic alloy ingot in step 4), the ingredients are distributed according to the following weight percentages: Nd 20.8%, Pr 5.2%, B 3%, Ir 0.053%, Os 0.053%, Sc 0.52%, Cu 0.6%, and the rest is Fe.

[0045] All the other processes are the same as in embodiment one.

Images