Method for producing sodium tungstate, method for collecting tungsten, apparatus for producing sodium tungstate, and method for producing sodium tungstate aqueous solution

摘要

Provided are a method for producing sodium tungstate by supplying an oxidant made of sodium nitrate or sodium nitrite to bring a tungsten containing material and the oxidant into contact with each other in an atmosphere containing oxygen to thereby continuously produce a reaction product; a method for collecting tungsten using the method; and an apparatus for producing sodium tungstate. Also provided are a method for producing a sodium tungstate aqueous solution in which a reductant is introduced into a melt containing the above-described reaction product which is then dissolved in water; and a method for collecting tungsten using the method.

主权项

1. A method for producing a sodium tungstate aqueous solution, said method comprising the steps of:
introducing a reductant into a melt containing a reaction product obtained by heating at least one of a tungsten containing material and an oxidant made of one of sodium nitrate and sodium nitrite to cause a reaction between said oxidant and said tungsten containing material; and dissolving, in water, the melt into which said reductant was introduced, wherein the reductant is a material that allows a decrease in a valence of metallic elements of an impurity metal in the melt.