中文摘要：

选用过硫酸盐＋银盐作氧化剂,在超声波作用下对硫化镍矿进行直接氧化浸出,研究搅拌速率、过硫酸钠浓度、浸出温度、银盐浓度及粒度对镍浸出率的影响规律,探讨氧化浸出反应机理。结果表明：在一定范围内,在超声波作用下搅拌速率或者粒度的变化对镍浸出率影响不显著;镍浸出率随Na2S2O8浓度的增大以及温度的升高而增加,但是当温度高于70℃后,浸出率的增加不明显;在浸出过程中起主导作用的是S2O82-,少量银盐的存在对浸出反应有促进作用。通过对该体系浸出过程动力学参数的考察,发现其符合缩核模型,过程总体反应速率受界面化学反应控制,表观活化能为39.67kJ/mol,建立了浸出过程的宏观动力学方程。

英文摘要：

The method of leaching nickel directly with oxidants of sulphate and silver salts with the assistance of ultrasonic was proposed.The influence of stirring speed,S2O82-concentration,leaching temperature,silver ion concentration and granularity on the leaching rate of nickel was investigated.The reaction mechanism of oxidizing leaching was explored.The results show that the influence of stirring speed or granularity on the leaching rate is not obvious in a certain range;with the increase of S2O82-concentration or leaching temperature,the leaching rate of nickel increases,whereas when the temperature is above 70 ℃,the increase of leaching rate is not obvious;S2O82-plays a dominant role in the oxidation action during the leaching process.The presence of a small amount of silver salt can promote the leaching reaction.Through investigating the dynamic parameters of the process,the dynamics in accordance with the shrinking core model is found.The overall reaction rate is controlled by interfacial chemical reaction with apparent activation energy of 39.67 kJ/mol.The macro-dynamic equations of the process are established.