Reducibility of Aswan Ore and Sinters with Varying Basicity Ratios

Abstract

THE RESULTS of the study of the reduction kinetics of sinters of different basicity ratios (0.2-2.0) as well as of Aswan ore of definite grain size (6-10) mm. by H2 gas at a definite "Redox" potential (100 1./g. 02 /hr.) at 950°C have shown that the general shape of the reduction functions of time are unique— partly parabolic and partly topochemical in nature—and that they obey the general Jeschar equation for the overall reduction process. A specific case of the general equation has been checked among other 6 formulas by modem computing techniques using an IBM electronic computer type 1620 and found to be in good agreement with the experimental results. The equation could be derived on a theoretictd basis and considers a reduction mechanism that is controlled mainly by both diffusion and chemical reaction processes as being the slowest pertaining and hence the rate determining factors in the complex reduction mechanism. Aswan ore is far more reducible than any of the other different kinds of studied fluxed or nonfluxed sinters. Also fluxed sinters made from Aswan ore by adding incre-asing amounts of lime are far more reducible by gases at a temperature level of 950°C—normally prevailing in the shaft cf a blast furnace than nonfluxed sinters.