GB561212A - Improvements in the production of chromium compounds - Google Patents

Improvements in the production of chromium compounds

Info

Publication number
GB561212A
GB561212A GB12167/42A GB1216742A GB561212A GB 561212 A GB561212 A GB 561212A GB 12167/42 A GB12167/42 A GB 12167/42A GB 1216742 A GB1216742 A GB 1216742A GB 561212 A GB561212 A GB 561212A
Authority
GB
United Kingdom
Prior art keywords
chromate
calcium
bichromate
acid
chromium
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
GB12167/42A
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.)
Individual
Original Assignee
Individual
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 Individual filed Critical Individual
Publication of GB561212A publication Critical patent/GB561212A/en
Expired legal-status Critical Current

Links

Classifications

    • C—CHEMISTRY; METALLURGY
    • C01—INORGANIC CHEMISTRY
    • C01G—COMPOUNDS CONTAINING METALS NOT COVERED BY SUBCLASSES C01D OR C01F
    • C01G37/00—Compounds of chromium
    • C01G37/14—Chromates; Bichromates

Landscapes

  • Chemical & Material Sciences (AREA)
  • Organic Chemistry (AREA)
  • Inorganic Chemistry (AREA)
  • Inorganic Compounds Of Heavy Metals (AREA)

Abstract

561,212. Chromates and bichromates. UDY, M. J. Aug. 28, 1942, No. 12167. Convention date, March 19, 1942. [Class 1 (iii)] Calcium chromate-bearing material is digested with an aqueous liquid containing an acid reacting with calcium chromate to produce a more insoluble calcium compound, in presence of an amount of basic constituents sufficient to convert most of the chromate to dichromate. The dichromate solution is separated from the insoluble matter, and may be reconverted into calcium chromate by treatment with a calcium compound.. The crude calcium chromate may be.obtained by roasting ferrochromium, oxidized ferrochromium, chromite ore &c. with lime, with or without soda ash. The acid may be carbonic or sulphuric or an acid salt of these acids. When calcium chromate is the endproduct desired only a minimum amount of alkali is added and the chromium is separated in solution as calcium bichromate, which is reconverted to chromate by treatment with lime. When an alkali metal bichromate is to be produced the metal is added in the form of'a chromate or an acid salt in amount sufficient to form bichromate with the' whole of the chromium.
GB12167/42A 1942-03-19 1942-08-28 Improvements in the production of chromium compounds Expired GB561212A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US561212XA 1942-03-19 1942-03-19

Publications (1)

Publication Number Publication Date
GB561212A true GB561212A (en) 1944-05-10

Family

ID=22002275

Family Applications (1)

Application Number Title Priority Date Filing Date
GB12167/42A Expired GB561212A (en) 1942-03-19 1942-08-28 Improvements in the production of chromium compounds

Country Status (1)

Country Link
GB (1) GB561212A (en)

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