Sumitomo Electric Industries, Limited

Sumitomo Electric Hardmetal Corp.

A.l.m.t. Corporation

Nagoya University

Fumiatsu Sato

Akihiko Ikegaya

Yoshiharu Yamamoto

Kazuo Sasaya

Syunsuke Yamanaka

Takahisa Iguchi

Takayuki Fudo

Akira Nakano

Takuya Okuno

Hideaki Ito

Takeshi Itakura

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.

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

A method for producing an ammonium tungstate aqueous solution includes the steps of: adding sulfuric acid to a solution containing tungstate ions; bringing the solution having the sulfuric acid added therein, into contact with an anion exchange resin; and bringing the anion exchange resin into contact with an aqueous solution containing ammonium ions.

Method for producing ammonium tungstate aqueous solution

Growing community of inventors

Itami, Japan

Fumiatsu Sato