Abstract
The roasting process of Egyptian chromite middling product with lime and soda was successfully performed to produce sodium chromate with a chromium recovery of 97% and an aluminum recovery of 81%. The optimum conditions were determined. Separation of alumina from the chromatealuminate solution was achieved by controlling the pH of the solution at 7.6 by carbon dioxide gas. Separation of sodium dichromate crystals was feasible and the production of .chromium oxide from the dichromate through solid state reduction by carbon is studied. Résumé Un produit mixte de chromite égyptienne a été grillé avec de la chaux et du carbonate de sodium pour donner du chromate de sodium avec un recouvrement en chrome de 97%et en aluminium de 81% Les conditions optimales ont été déterminées. L'extraction de l'alumine à partir de la solution chromate-aluminite a ete effectuee en maintenant le pH de la solution a 7.6 par du gaz carbonique. Il a été possible d'ioder les cristaux de dichromate de sodium et la préparation de l'oxyde de chrome à partir du dichromate par carbothermie a été étudiée.
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