Invention Grant
- Patent Title: Method for producing sodium tungstate, method for collecting tungsten, apparatus for producing sodium tungstate, and method for producing sodium tungstate aqueous solution
- Patent Title (中): 钨酸钠的制造方法，钨的收集方法，钨酸钠的制造装置以及钨酸钠水溶液的制造方法
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Application No.: US14139598Application Date: 2013-12-23
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Publication No.: US09249479B2Publication Date: 2016-02-02
- Inventor: Yoshiharu Yamamoto , Kazuo Sasaya , Takayuki Fudo , Akira Nakano , Syunsuke Yamanaka , Takahisa Iguchi , Fumiatsu Sato , Akihiko Ikegaya
- Applicant: A.L.M.T. Corp. , Sumitomo Electric Hardmetal Corp. , Sumitomo Electric Industries, Ltd.
- Applicant Address: JP Tokyo JP Itami-shi JP Osaka-shi
- Assignee: A.L.M.T. Corp.,SUMITOMO ELECTRIC HARDMETAL CORP.,Sumitomo Electric Industries, Ltd.
- Current Assignee: A.L.M.T. Corp.,SUMITOMO ELECTRIC HARDMETAL CORP.,Sumitomo Electric Industries, Ltd.
- Current Assignee Address: JP Tokyo JP Itami-shi JP Osaka-shi
- Agency: Venable LLP
- Agent Michael A. Sartori; Tamatane J. Aga
- Priority: JP2009-058410 20090311; JP2009-058411 20090311
- Main IPC: C22B34/36
- IPC: C22B34/36 ; C01G41/00 ; C01G41/02 ; C22B7/00 ; B01J8/10 ; C01G23/00 ; C01G35/00 ; C01G37/02 ; C01G53/00 ; C01G37/14 ; C01G51/00
Abstract:
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.
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