Ciineyt Arslan, Gijkhan Orhan
The possibility of producing chrome(VI) oxide from domestic chromite concentrates was investigated by carrying out laboratory-scale alkali fusion and water leaching experiments. The effects of temperature, the amount of NaOH added, and the flow rate of air on chromium extraction efficiency in an alkali fusion step were examined. Fusion product was leached with water to produce a clean Na2CrO4 solution, with water leaching experiments assessing the impact of temperature and solid/liquid ratio. The purity of the monochromate solution was evaluated through the production of dichromate from both impure and purified Na2CrO4 solutions. The purity of chrome(VI) oxides prepared from both types of monochromate was also analyzed. Kinetic investigations revealed that the fusion process can be best described by a shrinking core model with an apparent activation energy of 43.5 kJ/mol. In contrast, the results from leaching experiments suggested that the reaction rate was limited by product layer mass-transfer control, supported by an apparent activation energy of 10.5 kJ/mol.
@article{338f433b-8d77-4312-978d-8185ed16805f,
title={Investigation of chrome( VI) oxide production from chromite concentrate by alkali fusion},
author={Ciineyt Arslan and Gijkhan Orhan},
year={1997},
language={en}
}TY - JOUR TI - Investigation of chrome( VI) oxide production from chromite concentrate by alkali fusion AU - Ciineyt Arslan AU - Gijkhan Orhan PY - 1997 LA - en ER -
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