Invention Grant
- Patent Title: Process for preparing ammonium metatungstate
- Patent Title (中): 制备偏钨酸铵的方法
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Application No.: US13388896Application Date: 2009-12-30
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Publication No.: US08435467B2Publication Date: 2013-05-07
- Inventor: Zhangqing Luo
- Applicant: Zhangqing Luo
- Applicant Address: CN Jiangxi
- Assignee: Jiangxi Rare Earth and Rare Metals Tungsten Group Corporation
- Current Assignee: Jiangxi Rare Earth and Rare Metals Tungsten Group Corporation
- Current Assignee Address: CN Jiangxi
- Agency: Hammer & Associates, P.C.
- Priority: CN200910089165 20090805
- International Application: PCT/CN2009/076283 WO 20091230
- International Announcement: WO2011/015021 WO 20110210
- Main IPC: C01G41/00
- IPC: C01G41/00
Abstract:
A process for preparing ammonium metatungstate using ammonium paratungstate as raw material comprising: (A) leaching wet ammonium paratungstate with nitric acid to obtain a dilute solution of ammonium metatungstate; (B) concentrating the dilute solution of ammonium metatungstate to be a concentrated solution of ammonium metatungstate; and (C) spray-drying the concentrated solution of ammonium metatungstate to obtain powder of ammonium metatungstate.
Public/Granted literature
- US20120141359A1 PROCESS FOR PREPARING AMMONIUM METATUNGSTATE Public/Granted day:2012-06-07
Information query
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