New Trends of Leaching of Silicate and sulfide Minerals

Authors: Tarek Abdel Wahab Ali

Abstract-Although ore processing is an old technique, it is still the technique used to treat sulfide or silicate ores, a traditional and prevalent technique. Silicate ores treated thermally include kaolin, clay, feldspare, nepheline syenite, silica sand, quartz, talc and zircon. Sulfide ores include chalcopyrite, pyrite. The technique is facing challenges through new mineral hydrometallurgical processes. The new trends as hydrometallurgy, mechanical activation, pressure leaching and bioleaching are discussed in the present review article and compared with each other for both sulfides and silicate ores.

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Phosphate by Bioleaching of Egyptian Low Grade Phosphate Ore

Authors: Tarek A. A. El-Barbary

Abstract- The present work was done to evaluate the ability of some bacterial solubilizing phosphate to synthesis high quality phosphate fertilizer by bioleaching from low grade Egyptian ore. Bacillus megaterium, Rhizobium rhizogenes and Thiobacillu sthiooxidans were evaluated for their ability to phosphate dissolution from Egyptian Sebaiya west low grade phosphate ore by studying optimization conditions of incubation temperature, incubation time and inoculum size , pH and different carbon and nitrogen as energy sources. Results revealed that dissolution of P2O5 reached to 19.9, 68.4 and 32.2 for B. megaterium, R. rhizogenes and T. thiooxidans respectively. A model has been suggested which assumes that the phosphate radical was attacked by the reducing bacteria to produce unstable soluble phosphorus ions that readily oxidized to P2O5 with water oxygen. Kinetically, the leaching process was a zero order reaction. In this work applied of microorganism in industrial processes was practically feasible with low cost and friendly environmental process.

Keywords: phosphate beneficiation, bioleaching, phosphate upgrading, phosphate ore

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