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Preparation method for praseodymium neodymium dysprosium alloy

A technology of alloy, praseodymium and neodymium, which is applied in the field of preparation of neodymium and dysprosium alloy, to solve the problem of non-oxidation, improve the intrinsic coercive force, and reduce the production cost

Active Publication Date: 2015-01-21
张作州
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002]In the current production process of permanent magnet materials, especially in the production process of metal neodymium and dysprosium, metal neodymium and metal praseodymium neodymium are commonly used as raw materials for production The reason why NdFeB permanent magnet materials are easy to oxidize, demagnetize, and have poor consistency: During the production process of metal neodymium and metal praseodymium neodymium, iron conductive plates and stirring rods are easy to melt into the furnace during high-temperature production, and enter the metal neodymium, Metal praseodymium and neodymium products are removed, causing non-rare earth impurities to exceed the standard, and the total amount of rare earths is not enough
At the same time, the proportions of "praseodymium" and "neodymium" in each batch of praseodymium and neodymium oxide raw materials are not absolutely consistent. For example, the ratios of "praseodymium" and "neodymium" are: 15:85, 20:80, 25:75, etc. The content of rare earth elements in the metal is inconsistent, so the iron in the rare earth metal and the non-rare earth impurities exceed the standard, which makes the NdFeB products prone to oxidation, demagnetization, and unstable consistency.
The above-mentioned NdFeB permanent magnet materials produced with metal neodymium and metal praseodymium neodymium as raw materials can only produce H series according to the actual production and experimental results, and cannot produce UH series NdFeB alloy materials.

Method used

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  • Preparation method for praseodymium neodymium dysprosium alloy

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Embodiment Construction

[0022] The present invention will be specifically described below in combination with specific embodiments.

[0023] 1) Purification and precipitation of neodymium and dysprosium:

[0024] First, the Nd-D dysprosium scrap is purified, and the purification refers to dissolving the Nd-D dysprosium scrap with hydrochloric acid with a mass concentration of 33%, and the dissolving time is 2 hours, wherein the mass ratio of the Nd-D dysprosium scrap to the hydrochloric acid is 1.1:2.5. Then the neodymium and dysprosium leftovers are precipitated, and the precipitation refers to adding 2.0 tons of oxalic acid oxalic acid per ton to the solution obtained in the above steps to precipitate the precipitate, and the water content of the precipitate is 56% after dehydration.

[0025] 2) Roasting: put the dehydrated precipitate in a roasting furnace while drying and roasting, the roasting temperature is 1050° C., and keep warm for 3 hours.

[0026] 3) After being released from the furnace,...

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Abstract

The invention discloses a preparation method for praseodymium neodymium dysprosium alloy, comprising the following steps: purifying and precipitating praseodymium, neodymium and dysprosium; putting the dehydrated precipitates in a roasting furnace for simultaneous drying and roasting, wherein the temperature for roasting is 1050 to 1200 DEG C, and keeping the precipitates at the temperature for 3 to 4 hours; taking out the precipitates for preparation into powder and adding praseodymia, neodymium oxide, dysprosium oxide and R elements according to an analysis result so as to enable the content of praseodymium to be 19 to 26%, the content of neodymium to be 69 to 81%, the content of dysprosium to be 3.4 to 4.6% and the balance to be R elements; smelting the product obtained in the above-mentioned steps according to a time efficiency system and gradient temperatures. The praseodymium neodymium dysprosium alloy prepared by the method has a stable magnetic property, high coercive force, non-oxidizability and stable consistency.

Description

technical field [0001] The invention relates to a method for manufacturing a permanent magnet material, in particular to a method for preparing a neodymium-dysprosium alloy. Background technique [0002] In the current production process of permanent magnet materials, especially in the production process of metal neodymium and dysprosium, there is a common reason why metal neodymium and metal praseodymium neodymium are used as raw materials to produce NdFeB permanent magnet materials, which are easy to oxidize, demagnetize, and have poor consistency. : In the production process of metal neodymium and metal praseodymium neodymium, iron conductive plates and stirring rods are easily melted into the furnace during high-temperature production links, and enter into metal neodymium and metal praseodymium neodymium products, causing non-rare earth impurities to exceed the standard, and rare earth total Not enough. At the same time, the proportions of "praseodymium" and "neodymium...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C1/05C22C28/00H01F1/047
Inventor 张作州
Owner 张作州
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