【摘要】 小于2 mm的氧化锌矿(含锌5.17%)与5%的水泥混合,制粒并固化,所得颗粒直径5~8 mm。固化3天、10天、45天的颗粒用碱性溶液浸出,最大浸出率分别为92.2%、87.3%、72.9%。减少固化时间能够缩短反应时间、增加颗粒中锌的溶解以及减少浸出剂中初始锌浓度的影响。实验表明颗粒最少需固化3天。动力学研究表明浸出过程受浸出剂通过脉石层的扩散控制,表观速率常数分别为3.51×10-2d-1、8.09×10-3d-1和4.74×10-3d-1。更多还原

【Abstract】 Low grade powdery zinc oxide ores(5.17% Zn,< 2 mm) are mixed with 5% cement, then pelletized and solidified.The diameters of the pellets obtained are 5~8 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 92.2%,87.3% and 72.9% 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 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 3.51×10-2 d-1,8.09×10-3 d-1, 4.74×10-3 d-1 respectively.更多还原