Chemistry of inorganic compounds – Treating mixture to obtain metal containing compound – Group vib metal
Patent
1977-11-14
1979-07-24
Carter, Herbert T.
Chemistry of inorganic compounds
Treating mixture to obtain metal containing compound
Group vib metal
423 53, 423596, C01G 3714
Patent
active
041622952
ABSTRACT:
A method for producing alkali metal chromates by double roasting chrome ores without the use of alkaline earths is disclosed. The pollution and hygiene problems associated with the use of lime are substantially eliminated and only negligible amounts of alumina are found in the product chromate liquors without employing steps previously thought necessary. These advantages are achieved by controlling (1) the Bichromate Equivalent: aluminum oxide ratio in the mix, (2) the amount of alkali metal salts added to the mix, (3) the roasting time, (4) the composition and alkalinity of the liquor used for leaching the roast, and (5) the temperature employed, in both roasts.
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Frick Douglas G.
Morgan Thomas R.
Subbanna Somanahalli N.
Allied Chemical Corporation
Carter Herbert T.
Hoffman Thomas D.
Stewart Anthony J.
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