GB823043A - Purification of tungsten by recrystallization of normal alkali metal tungstate as the paratungstate - Google Patents
Purification of tungsten by recrystallization of normal alkali metal tungstate as the paratungstateInfo
- Publication number
- GB823043A GB823043A GB31324/55A GB3132455A GB823043A GB 823043 A GB823043 A GB 823043A GB 31324/55 A GB31324/55 A GB 31324/55A GB 3132455 A GB3132455 A GB 3132455A GB 823043 A GB823043 A GB 823043A
- Authority
- GB
- United Kingdom
- Prior art keywords
- alkali metal
- tungstate
- paratungstate
- normal
- recrystallization
- 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
Links
Classifications
-
- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01G—COMPOUNDS CONTAINING METALS NOT COVERED BY SUBCLASSES C01D OR C01F
- C01G41/00—Compounds of tungsten
Landscapes
- Chemical & Material Sciences (AREA)
- Organic Chemistry (AREA)
- Inorganic Chemistry (AREA)
- Inorganic Compounds Of Heavy Metals (AREA)
Abstract
Alkali metal (including ammonium) tungstates are purified by forming a saturated alkaline solution of a normal alkali metal tungstate containing undissolved normal tungstate, acidifying to pH of 7 to 7.5 to dissolve the normal alkaline metal tungstate crystals and further acidifying the solution to a pH of 6 to 6.9 to crystallize the corresponding alkali metal paratungstate. Acidification is preferably effected at 80-100 DEG C. with hydrochloric acid; a small amount of sodium nitrite may be added to avoid reduction of the tungstate during acidification. The alkali metal paratungstate crystals obtained on cooling may be treated with a calcium chloride solution to form calcium tungstate.
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US823043XA | 1954-11-02 | 1954-11-02 |
Publications (1)
Publication Number | Publication Date |
---|---|
GB823043A true GB823043A (en) | 1959-11-04 |
Family
ID=22170359
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
GB31324/55A Expired GB823043A (en) | 1954-11-02 | 1955-11-02 | Purification of tungsten by recrystallization of normal alkali metal tungstate as the paratungstate |
Country Status (1)
Country | Link |
---|---|
GB (1) | GB823043A (en) |
-
1955
- 1955-11-02 GB GB31324/55A patent/GB823043A/en not_active Expired
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