Preparation method of praseodymium-iron alloy

Abstract

The invention discloses a preparation method of a praseodymium-iron alloy. The preparation method comprises the following steps: in equipment for electrolyzing a praseodymium-iron intermediate alloy, under a fluoride molten salt electrolyte system of praseodymium fluoride and lithium fluoride, direct current is introduced to electrolyze praseodymium oxide serving as an electrolysis raw material to obtain the praseodymium-iron intermediate alloy; and the praseodymium-iron intermediate alloy and iron serve as raw materials, the praseodymium-iron alloy is prepared through a melting and blending method, and the melting and blending process is carried out under the vacuum condition. According to the preparation method of the praseodymium-iron alloy, the praseodymium-iron alloy obtained after the praseodymium-iron intermediate alloy obtained through molten salt electrolysis is subjected to vacuum melting and blending is accurate in component control, due to the fact that melting is conducted under vacuum, the burning loss of rare earth is small, the yield is high, the praseodymium-iron alloy is uniform in component, small in segregation and low in impurity content, and when the praseodymium-iron alloy is applied to rare earth steel, the yield of rare earth is high, and the effect is remarkable.

Description

[0001] This patent application is a divisional application with application number: 201611173958.6, name: praseodymium-iron alloy and its preparation method, and application date: December 16, 2016. technical field [0002] The invention relates to a rare earth iron alloy technology, in particular to a preparation method of a praseodymium iron alloy. Background technique [0003] At present, steel is the largest metal structural material and is widely used in construction, energy, transportation, aerospace and other fields. The application and research of rare earths in steel have also developed rapidly. The addition of rare earths to molten steel can desulfurize, deoxidize, change the shape of inclusions, etc., and can improve the plasticity, stamping performance, wear resistance and welding performance of steel. Various rare earth steels such as rare earth steel plates for automobiles, die steels, rails, etc. have been widely used. [0004] The addition method of rare ear...

AI Technical Summary

Problems solved by technology

This method is the method commonly used at present, and its process technology is simple, can make multi-element master alloy or application alloy, but also has deficiency: 1) rare earth metal easily local concentration is too high in molten iron, produces segregation; 2) this method The raw materials used are rare earth metals, especially for medium and heavy rare earth metals, the preparation process is complicated and the cost is high; 3) The melting temperature is relatively high. Since rare earth metals and pure iron are used as raw materials, the melting temperature requirements are high

This method has low production cost and simple process, but it also has the following defects: the distribution of rare earth and iron in the alloy fluctuates greatly, it is difficult to control, and the distribution error is as high as 3%-5%, which affects product consistency

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