PROCESS FOR PRODUCING SODIUM TUNGSTATE, METHOD FOR COLLECTING TUNGSTEN, APPARATUS FOR PRODUCING SODIUM TUNGSTATE, AND PROCESS FOR PRODUCING AQUEOUS SODIUM TUNGSTATE SOLUTION

摘要

Provided are a method for producing sodium tungstate by supplying an oxidant (4) made of sodium nitrate or sodium nitrite to bring a tungsten containing material (3) and the oxidant (4) into contact with each other in an atmosphere containing oxygen to thereby continuously produce a reaction product (9); 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 (9) containing the above-described reaction product which is then dissolved in water; and a method for collecting tungsten using the method.