Production of low sulphur chromium (III) oxide

Details Production of low sulphur chromium (III) oxide Production of low sulphur chromium (III) oxide

1978-12-11

1980-11-25

Carter, Herbert T.

Chemistry of inorganic compounds

Oxygen or compound thereof

Metal containing

106302, C01G 37033

Patent

active

042358620

ABSTRACT:
A process for the production of low sulphur chromium(III) oxide comprising annealing at a calcining temperature from about 800.degree. C. to 1100.degree. C. a mixture of alkali metal chromate and about 0.7 to 0.96 times its molar amount of ammonium sulfate, and separating the chromium(III) oxide formed from the alkali metal salt. Advantageously the ammonium sulfate in the form of a concentrated solution is mixed with solid alkali metal dichromate and the mixture thereafter is adjusted prior to calcination to a water concentration of less than about 15% by weight of water.

REFERENCES:
patent: 1429912 (1922-09-01), d'Adrian
patent: 2921838 (1960-01-01), Melville
patent: 4040860 (1977-08-01), Mansmann et al.
patent: 4052225 (1977-10-01), Mansmann et al.
patent: 4067747 (1978-01-01), Mansmann et al.

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