Preparation method for praseodymium neodymium dysprosium alloy

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, metal neodymium and metal praseodymium neodymium are generally used as raw materials to produce NdFeB permanent magnet materials. Reasons for easy oxidation, demagnetization, and poor consistency: In 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 links, and enter into metal neodymium and metal praseodymium neodymium products, causing non-rare earth impurities to exceed the standard, and the total amount of rare earth not enough. At the same time, the proportions of "praseodymium" and "neodymium" in each...

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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 generally used as raw materials to produce NdFeB permanent magnet materials. Reasons for easy oxidation, demagnetization, and poor consistency: In 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 links, and enter into metal neodymium and metal praseodymium neodymium products, causing non-rare earth impurities to exceed the standard, and the total amount of rare earth 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.

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