Crushing, Pelletizing and Alkaline Leaching of Massive Low Grade Zinc Oxide Ores

摘要：

The percentage of leached zinc in massive zinc oxide ores (11.7% Zn,＞2 mm) is up to 73.3 % in 120 days. Alternatively, crushed to -0.154 mm, mixed with cement 5% (wt), pelletized and solidified. The diameters of the pellets obtained are between 5 mm to 8 mm. When the pellet solidification periods are 3 days, 10 days and 45 days respectively, the alkaline leaching rates of zinc in the pellets are up to 95.8%, 89.1% and 76.4% respectively. Decreasing the solidification time can reduce reaction time, increase dissolution of zinc in pellets and lower the effect of initial zinc concentration on leaching rate. The experiment results show that the minimum solidification time is three days, and the kinetic study indicates that alkaline leaching of the low grade zinc oxide pellets is controlled by the diffusion of the leach liquor through the gangue layer in the whole leach process,and the apparent rate constants are 3.33×10-2 day-1, 9.18×10-3 day-1, 5.82×10-3 day-1 respectively.

关键词： Pelletizing Alkaline leaching Solidification

作者: L. Y. Feng X. X. Jiang S. D. Wang X. W. Yang

作者单位: Faculty of Materials and Metallurgical Engineering, Kunming University of Science and Technology, Ku Beijing General Research Institute of Mining and Metallurgy, Beijing, China

会议类型: 国际会议

会议名称: XXIV International Mineral Processing Congress(第24届国际矿物加工大会)

会议地点: 北京

会议语种:英文

页码: 3147-3153

在线出版日期: 2008-09-24（万方平台首次上网日期，不代表论文的发表时间）