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Purification of rare earth metals by regional melting method - basic principle
In the binary system, if the gold-containing metal impurities and then slowly cooled melt was solidified, at a certain temperature, as a solid, when liquid equilibrium along two, the original metal impurities evenly distributed redistributes continue points The segment is slowly solidified, and the impurities in the post-solidified metal are different from the impurities in the first solidified metal. If the ingot containing impurities is melted and gradually solidified from one end to the other end, the impurities will be concentrated at one end to purify the metal. This process is called directional solidification. In order to achieve the purity of the metal, the directionally solidified metal needs to cut off the two end portions of the impurity enrichment, and the intermediate section is repeatedly directionally solidified. As a result, the yield of the metal is low and the production cost is high. In order to overcome this disadvantage, a community melting method can be employed.