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 paratungstate

Info

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
Application number
GB31324/55A
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.)
Wah Chang Corp
Original Assignee
Wah Chang Corp
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 Wah Chang Corp filed Critical Wah Chang Corp
Publication of GB823043A publication Critical patent/GB823043A/en
Expired legal-status Critical Current

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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.
GB31324/55A 1954-11-02 1955-11-02 Purification of tungsten by recrystallization of normal alkali metal tungstate as the paratungstate Expired GB823043A (en)

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)

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