GB1083957A - Improvements relating to methods of preparing tungstic acid - Google Patents

Improvements relating to methods of preparing tungstic acid

Info

Publication number
GB1083957A
GB1083957A GB1598166A GB1598166A GB1083957A GB 1083957 A GB1083957 A GB 1083957A GB 1598166 A GB1598166 A GB 1598166A GB 1598166 A GB1598166 A GB 1598166A GB 1083957 A GB1083957 A GB 1083957A
Authority
GB
United Kingdom
Prior art keywords
tungstic acid
filtered
acid
tungstate solution
methods
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired
Application number
GB1598166A
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Philips Electronics UK Ltd
Original Assignee
Philips Electronic and Associated Industries Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Philips Electronic and Associated Industries Ltd filed Critical Philips Electronic and Associated Industries Ltd
Publication of GB1083957A publication Critical patent/GB1083957A/en
Expired legal-status Critical Current

Links

Classifications

    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22B—PRODUCTION AND REFINING OF METALS; PRETREATMENT OF RAW MATERIALS
    • C22B34/00—Obtaining refractory metals
    • C22B34/30—Obtaining chromium, molybdenum or tungsten
    • C22B34/36—Obtaining tungsten
    • C—CHEMISTRY; METALLURGY
    • C01—INORGANIC CHEMISTRY
    • C01G—COMPOUNDS CONTAINING METALS NOT COVERED BY SUBCLASSES C01D OR C01F
    • C01G41/00—Compounds of tungsten

Abstract

Tungstic acid is prepared by acidifying alkali metal tungstate solution in two stages, the first to a pH of 4-6 whereby impurities are precipitated and filtered off, and the second to a hydrogen ion concentration of at least 1 gm. equiv. per litre whereby tungstic acid is precipitated. Each stage may be effected by feeding acid and tungstate solution simultaneously into a reaction vessel at such rates that the resultant mixture has the required acidity. Any strong acid may be used. In the example, sodium tungstate solution, obtained by extraction of wolframite ore with NaOH solution, is acidified with 30% HCl to a pH of 5, filtered, and further acidified to a hydrogen ion concentration of 1.5 equiv/l. The tungstic acid is filtered, washed with 0.1 N HNO3, and dried at 120 DEG C. The final product contains less than 0.001% SiO2.
GB1598166A 1965-04-15 1966-04-12 Improvements relating to methods of preparing tungstic acid Expired GB1083957A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
NL6504827A NL6504827A (en) 1965-04-15 1965-04-15

Publications (1)

Publication Number Publication Date
GB1083957A true GB1083957A (en) 1967-09-20

Family

ID=19792947

Family Applications (1)

Application Number Title Priority Date Filing Date
GB1598166A Expired GB1083957A (en) 1965-04-15 1966-04-12 Improvements relating to methods of preparing tungstic acid

Country Status (5)

Country Link
BE (1) BE679473A (en)
DE (1) DE1592472A1 (en)
GB (1) GB1083957A (en)
NL (1) NL6504827A (en)
SE (1) SE328557B (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
AU2005243988B2 (en) * 2004-05-11 2011-03-10 H.C. Starck Tungsten Gmbh Tungstic acid powder consisting of spherical tungsten particles and method for producing same
CN113684379A (en) * 2021-08-30 2021-11-23 崇义章源钨业股份有限公司 Method for decomposing wolframite concentrate and application

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN116143174B (en) * 2023-04-20 2023-06-30 崇义章源钨业股份有限公司 Method for preparing ammonium paratungstate by scheelite short process

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
AU2005243988B2 (en) * 2004-05-11 2011-03-10 H.C. Starck Tungsten Gmbh Tungstic acid powder consisting of spherical tungsten particles and method for producing same
US8052956B2 (en) 2004-05-11 2011-11-08 H. C. Starck Gmbh Tungstic acid powder consisting of spherical tungsten particles and method for producing same
US8454931B2 (en) 2004-05-11 2013-06-04 H.C. Starck Gmbh Tungstic acid powder consisting of spherical tungsten particles and method for producing same
RU2525548C2 (en) * 2004-05-11 2014-08-20 Х.К. Штарк ГмбХ унд Ко. КГ Им Шлееке 78-91 38642 Гослар Tungstic acid powder and use thereof to obtain tungsten metal powder
CN113684379A (en) * 2021-08-30 2021-11-23 崇义章源钨业股份有限公司 Method for decomposing wolframite concentrate and application

Also Published As

Publication number Publication date
NL6504827A (en) 1966-10-17
DE1592472A1 (en) 1970-12-23
BE679473A (en) 1966-10-13
SE328557B (en) 1970-09-21

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