Preparation method for Pr-Nd metal

Abstract

A preparation method for Pr-Nd metal includes the following steps that (1) a graphite electrolytic cell is subjected to oven drying until the graphite electrolytic cell contains no water; (2) the graphite electrolytic cell is heated until the bottom of the graphite electrolytic cell is red, a mixture of LiF and PrNdF is added and heated into a liquid state, and the mass ratio of the LiF to the PrNdF is 1:7-9; (3) PrNdO is evenly put into the graphite electrolytic cell, the mass ratio of the PrNdO put every hour to the mixture of the LiF and the PrNdF is 1:31-32, electrolytic voltage is controlled to be 10 V, electrolysis temperature is controlled to be 1020-1060 DEG C, and mixing is conducted in the electrolysis process so that the material in the graphite electrolytic cell can be evenly mixed; and (4) natural cooling is conducted after the metal is discharged out of a furnace. The preparation method provided by the invention can achieve preparation of the low-carbon Pr-Nd metal.

Description

technical field [0001] The invention relates to a preparation method of praseodymium and neodymium metal. Background technique [0002] The existing preparation method of praseodymium and neodymium generally includes the following steps: (1). Oven the graphite electrolytic cell; (2). Add the mixture of LiF and PrNdF into the graphite electrolytic cell and heat the mixture to a liquid state to form an electrolyte (3). PrNdO is evenly put into the graphite electrolytic cell, and PrNdO dissolves in the electrolyte to perform electrolytic reaction with the electrolyte; (4). Cool naturally after being out of the furnace. [0003] In the above electrolysis reaction process, the anode uses a graphite anode, and oxygen will be released during the electrolysis reaction process, and the released oxygen will react with the graphite anode to generate CO and CO 2 , in the high-temperature electrolytic cell, CO burns immediately and reacts with the graphite anode to consume the graphite ...

AI Technical Summary

Problems solved by technology

[0003] In the above electrolysis reaction process, the anode uses a graphite anode, and oxygen will be released during the electrolysis reaction process, and the released oxygen will react with the graphite anode to generate CO and CO 2 , in the high-temperature electrolytic cell, CO burns immediately and reacts with the graphite anode to consume the graphite anode. At the same time, the CO combustion generates high temperature again, which makes the graphite anode and the graphite electrolytic cell fall off, so that the carbon content in the produced praseodymium and neodymium metal is relatively high

[0004] At the same time, the amount of input oxide PrNdO will also affect the carbon content in the final product PrNd alloy. The reason is that if the amount of input PrNdO is too high, the resistance value in the electrolyte will increase, and the increase of resistance value will make the system The temperature rises, which makes the graphite electrolytic cell fall off, so that the carbon content in the produced praseodymium neodymium metal is high; if the amount of PrNdO input is low, the oxygen released by the electrolytic reaction is not enough due to the lack of oxygen Completely react with the graphite anode to generate more CO, too much CO will cause the above-mentioned problem of CO combustion to generate high temperature again, so that the carbon content in the produced praseodymium and neodymium metal is relatively high

[0005] At the same time, the graphite electrolytic cell is generally installed in the iron furnace body. During high-temperature electrolysis, the iron furnace body is affected by high temperature, and some iron elements will enter into the produced NdPr metal, which makes the iron content of NdPr metal higher.