Process for the preparation of alkaline chromates from chromium minerals
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United States of America Patent
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Dec 20, 1994
Grant Date -
N/A
app pub date -
Oct 22, 1992
filing date -
May 9, 1990
priority date (Note) -
Expired
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Abstract
A process for the production of alkaline chromates by means of oxidative disaggregation in a reactor of substances containing trivalent chromium compounds in admixture with alkali. The oxidative disaggregation is carried out in dry phase by moving the mixture within the reactor while heating the mixture by indirect heat exchange in the absence of combustion gases and under mechanical stress, and feeding to the interior of the reactor oxidizing gas. The mixture is heated to a temperature of between 500.degree. and 1500.degree. C. The oxidizing gas is fed with an oxygen concentration in a range between 8 and 100%. Gases leaving the reactor are used for the acidification of an aqueous solution of alkaline chromates which is then dried and supplied to the reactor. The reactor is a rotating tubular reactor and the mixture moves continuously through the rotating reactor.
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