BENEFICIATION OF MANGANESE FROM ITS ORES PRESENT IN ARAB REPUBLIC OF' EGYPT USING SOME REDUCTANTS

Abstract

The present work deals with the application of reduction leaching process to the extraction of manganese from Egyptian fine manganese ore wastes by the aid of metallurgical wastes in the Egyptian Ferroalloys Company. In this technique, metallurg-ical coke, semi coke, charcoal, pure and impure sugars, starch, molasses, scum and hydrogen peroxide were utilized as reductants in sulphuric acid medium. The optimum conditions of the process are:( 120 mesh ore particle size and minus 200 mesh reductant particle size, 6o/o ore : H2S04 ratio in the case of metallurgical coke, semi coke and charcoal , minnus 100 mesh ore particle size and 1Oo/o ore : H2S04 ratio in the case of pure, impure sugars. starch, molasses, scum and hydrogen peroxide) 90, 90, 90, 60, 60, 70, 70 ,80 and 60 minutes leaching time,90, 90, 90, 90, 90, 90, 90, 90 and 60 C leaching temperature ,25 ,25, 20, 20, 20, 25, 30, 30 and 15o/o H2S04,5:1 , 4:1,3:1,1:1,2:1,2.5:1,3:1,4:1 and 1.6:1 reductant: Mn02 ratios. The percentage recoveries equal 86.5, 93, 98.6, 91.5, 100, 100, 96,90.5 and 96.2% in the case of metallurgical coke, semi coke, charcoal, pure, impure sugars, starch, molasses, scums and hydrogen peroxide, respectively.