Simulation of solute transportation within porous particles during the bioleaching process

• Published in: International journal of minerals, metallurgy and materials metallurgy and materials, 2010-08, Vol.17 (4), p.389-396
• Main Authors: Yin, Sheng-hua, Wu, Ai-xiang, Wang, Shao-yong, Wang, Hong-jiang
• Format: Article
• Language: English
• Subjects: Bacteria; BACTERIAL LEACHING; Ceramics; Characterization and Evaluation of Materials; Chemistry and Materials Science; Composites; COMPUTER SIMULATION; Copper; Copper converters; Copper ores; Copper sulfides; Corrosion and Coatings; EXTRACTIVE METALLURGY; Ferric ions; Glass; Ions; LEACHING; Materials Science; Metallic Materials; MINERALS; Natural Materials; OXIDATION; POROSITY; Simulation; SOLUTES; Sulfides; SULFURIC ACID; Surfaces and Interfaces; Thin Films; Tribology; 仿真结果; 多孔颗粒; 数值模拟; 浓度增加; 浸出过程; 溶质运输; 颗粒表面
• ISSN: 1674-4799; 1869-103X
• DOI: 10.1007/s12613-010-0331-7

A mathematical model, accounting for the sulfuric acid and ferric ions diffusion and the copper sulfide mineral leaching process, was developed for an ore particle by considering its porous structure. It was simulated with the simulation tool COMSOL Multiphysics. The simulation results show that the highest acid and ferric concentrations near the particle surface are apparent, while the concentrations in the central particle increase slightly as the less-porous ore core with low permeability prevents the oxidation from penetrating. The extraction of the mineral near the particle surface is the maximum, mainly because of ample sulfuric acid, ferric ions, bacteria, and oxygen available for the leaching process. Because of low oxidation concentration in the central part of the particle, the reaction rate and copper sulphide conversion are small. The simulation shows good agreement with the experimental results.