Method for producing high-purity metal scandium from low-purity scandium oxide enrichment

Abstract

The invention discloses a method for producing high-purity metal scandium from low-purity scandium oxide enrichment. The method comprises the following steps that the low-purity scandium oxide enrichment is dissolved to obtain a solution A; the solution A is hydrolyzed, and filtrate is collected; ammonia sink is carried out, and scandium hydroxide precipitate is collected; the scandium hydroxide precipitate is dissolved to obtain a scandium chloride solution; industrial grade sodium fluoride is added into the scandium chloride solution, stirring is carried out for a certain time, and scandiumfluoride precipitate is obtained; high-temperature dehydration is carried out obtain scandium fluoride; reduced scandium is prepared to obtain the crude reduced metal scandium; and high-purity metal scandium is prepared, the crude reduced metal scandium is subjected to low-temperature distillation, high temperature distillation is carried out, and finally sub-high temperature distillation is carried out to obtain the high-purity metal scandium. The adopted raw materials are low-purity scandium oxide enrichment with the scandium oxide content of 3%-5%, the cost is low, and obtaining is easy; and the adopted method is simple to operate, and high-purity metal scandium can be obtained. According to the method, the production cost is reduced, large-scale industrialization is facilitated, and the income of enterprises is improved.

Description

technical field [0001] The invention relates to the field of preparation methods of high-purity scandium metal, in particular to a method for producing high-purity scandium metal from a low-purity scandium oxide enrichment. Background technique [0002] For quite a long time after scandium was discovered, the use of scandium has not been shown because it is difficult to obtain. With the increasing improvement of the separation method of rare earth elements, the compounds used to purify scandium now have a fairly mature process. Because scandium has the weakest alkalinity of hydroxide compared with yttrium and lanthanides, so when the rare earth element mixed ore containing scandium is treated with ammonia after being transferred into solution, scandium hydroxide will be precipitated first, Therefore, it can be separated from rare earth elements relatively easily by using the "fractional precipitation" method. Another method is to use the "fractional decomposition" of nitra...

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Problems solved by technology

[0005] The purpose of the invention is to provide a method for producing high-purity metal scandium from a low-purity scandium oxide enrichment, which solves the problem that the raw materials used in the existing high-purity scandium metal preparation method itself need high-purity raw materials, so that the preparation The obtained scandium metal is of high purity, which causes high cost of raw materials, and the problem that the purity of scandium metal obtained by the existing preparation method is not high

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