Rule of oxygen transmission in dump leaching^①

来源期刊：中南大学学报(英文版)2006年第3期

论文作者：吴爱祥 王洪江 江怀春 杨保华 习泳 查克兵

文章页码：295 - 299

Key words：dump leaching; bioleaching; oxygen transmission; pyrite; mass transfer coefficient

Abstract: According to the chemical equations, the flux and concentration of oxygen required during bacterial leaching sulfuric mineral were investigated; the rule of air bubble transmitted in granular was researched in the Dump Leaching Plant of Dexing Copper Mine. The results show that lack of oxygen in dump leaching is the critical factor of restricting leaching reaction. Pyrite is the primary oxygen-consuming mineral in bioleaching. When its content is too high, it needs a great deal of oxygen for reaction and competes for the finite oxygen with objective minerals, and thus the leaching velocity decreases greatly. The average size of ore particles and diameter of bubbles are the key parameters affecting the mass transfer coefficient. Reverse analysis was adopted, and it shows that 44.8 m3air perunit ore can meet the requirement of production if the molar ratio of pyrite to chalcopyrite is 10.