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Production of potassium chromate from a low-grade Egyptian chromite ore and potassium carbonate

El-Roudi A. M., Othman A. G., Alla E. M. A., Zhran R. M.

Polish Journal of Applied Chemistry

2006

Vol. 50, nr 3-4

65-73

The production of K2CrO4 from low-grade chromiteore, its preoxidiscd form and locally available materials has been studied. The roasting of chrome ore-K2CO3 mixture with a mole ratio of 1:2.75 for 300 min.at 1000°C was performed to prepare K2CrO4 with a recovery of 93%. Increased recovery was obtained when chromitc was preoxidised and roasted up to 975°C. The oxidation rate of roasting with SiO2 mole ratio of 2.9 was increased when adding a clay raw material. The reaction mechanism was presented.