Process for producing ferric oxide compositions of polishing rouge grade and the product thereof

Claim 1

A ROUGE OF GLASS-POLISHING GRADE DERIVED BY CALCINATION OF A MATERIAL SELECTED FROM THE GROUP CONSISTING OF BOG IRON ORE AND FERROSO FERRIC OXIDE SLUDGE, SAID ROUGE BEING COMPOSED OF AT LEAST ABOUT 92% FERRIC OXIDE, THE BALANCE BEING COMPOSED MOSTLY OF COMPLEX FORMS OF SILICA, ALUMINA AND IRON ALUMINUM SILICATES, DERIVED FROM THE MATERIAL TREATED AND CONTAINING NOT MORE THAN 0.15% RESIDUAL CARBON AS AN IMPURITY, THE SAID MATERIAL HAVING BEEN ALTERED AS TO ITS CONTENT SUBSTANTIALLY ONLY BY (1) CALCINING THE MATERIAL AT A TEMPERATURE BETWEEN 500* AND 900* C. AND (2) REMOVING RESIDUAL CARBON FROM THE CALCINED PRODUCT WHILE LEAVING THE INORGANIC COMPONENTS OF THE CALCINED PRODUCED UNCHANGED.