Kinetics of formation of sodium chromate from El-Baramiya chromite ore concentrate with soda ash pellets

In Egypt, about seventeen occurrences of chromite ore are located among El-Baramiya region in Eastern desert. El-Baramiya ore shows that dressing is required to obtain concentrate with high chromium content. Egypt imports sodium chromate for local industries from abroad and this on the expense of our foreign currency. Thus, the converts of El-Baramiya concentrate to produce sodium chromate is very essential to the local industries. The present work is concerned with the kinetics of roasting process for the production of sodium chromate from pellets composed El-Baramiya chromite ore concentrate with soda ash. The results indicated that the recovery of chromic oxide depends on the size of the roasted pellets, the temperature and time of roasting. The reaction kinetics of sodium chromate formation is controlled by solid state diffusion.