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1. (WO2011015021) PROCESS FOR PREPARING AMMONIUM METATUNGSTATE
Latest bibliographic data on file with the International Bureau   

Pub. No.:    WO/2011/015021    International Application No.:    PCT/CN2009/076283
Publication Date: 10.02.2011 International Filing Date: 30.12.2009
Chapter 2 Demand Filed:    08.04.2011    
IPC:
C01G 41/00 (2006.01)
Applicants: JIANGXI RARE EARTH AND RARE METALS TUNGSTEN GROUP CORPORATION [CN/CN]; No. 118, Beijing West Road Nanchang, Jiangxi 330046 (CN) (For All Designated States Except US).
LUO, Zhangqing [CN/CN]; (CN) (For US Only)
Inventors: LUO, Zhangqing; (CN)
Agent: BEIJING WANG IP AGENCY, LTD.; Suite 515, ZhongGuanCun Tower, No. 27 ZhongGuanCun Street, Haidian District Beijing 100080 (CN)
Priority Data:
200910089165.X 05.08.2009 CN
Title (EN) PROCESS FOR PREPARING AMMONIUM METATUNGSTATE
(FR) PROCÉDÉ DE PRÉPARATION DE MÉTATUNGSTATE D'AMMONIUM
(ZH) 一种偏钨酸铵的制备方法
Abstract: front page image
(EN)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.
(FR)Cette invention concerne un procédé de préparation de métatungstate d'ammonium à partir de paratungstate d'ammonium à titre de matière première, ledit procédé comprenant les étapes consistant à : (A) lixivier le paratungstate d'ammonium humide avec de l'acide nitrique pour obtenir une solution diluée de métatungstate d'ammonium; (B) concentrer la solution diluée de métatungstate d'ammonium pour obtenir une solution concentrée de métatungstate d'ammonium; et (C) lyophiliser la solution concentrée de métatungstate d'ammonium pour obtenir une poudre de métatungstate d'ammonium.
Designated States: AE, AG, AL, AM, AO, AT, AU, AZ, BA, BB, BG, BH, BR, BW, BY, BZ, CA, CH, CL, CN, CO, CR, CU, CZ, DE, DK, DM, DO, DZ, EC, EE, EG, ES, FI, GB, GD, GE, GH, GM, GT, HN, HR, HU, ID, IL, IN, IS, JP, KE, KG, KM, KN, KP, KR, KZ, LA, LC, LK, LR, LS, LT, LU, LY, MA, MD, ME, MG, MK, MN, MW, MX, MY, MZ, NA, NG, NI, NO, NZ, OM, PE, PG, PH, PL, PT, RO, RS, RU, SC, SD, SE, SG, SK, SL, SM, ST, SV, SY, TH, TJ, TM, TN, TR, TT, TZ, UA, UG, US, UZ, VC, VN, ZA, ZM, ZW.
African Regional Intellectual Property Organization (BW, GH, GM, KE, LS, MW, MZ, NA, SD, SL, SZ, TZ, UG, ZM, ZW)
Eurasian Patent Organization (AM, AZ, BY, KG, KZ, MD, RU, TJ, TM)
European Patent Office (AT, BE, BG, CH, CY, CZ, DE, DK, EE, ES, FI, FR, GB, GR, HR, HU, IE, IS, IT, LT, LU, LV, MC, MK, MT, NL, NO, PL, PT, RO, SE, SI, SK, SM, TR)
African Intellectual Property Organization (BF, BJ, CF, CG, CI, CM, GA, GN, GQ, GW, ML, MR, NE, SN, TD, TG).
Publication Language: Chinese (ZH)
Filing Language: Chinese (ZH)