Chen An-An, Zhou Shao-Qi, Huang Peng-Fei
College of Environmental Science and Engineering, South China University of Technology, Guangzhou 510006, China.
Huan Jing Ke Xue. 2013 Jul;34(7):2729-34.
Leaching is the most important step of josephinite tailing recycle technology. This step can separate the valuable metal Mg from Si and other impure metal. Effects of sulfuric acid on leaching Mg efficiency from josephinite tailings were investigated. To obtain the leaching behavior, a modified unreacted shrinking core model that based on the experimental data was used to determine the dissolution kinetic parameters. The model was significant and showed that the dissolution of Mg2+ in josephinite tailing was controlled by the produce layer diffusion, apparent activation reaction energy E = 34.04 kJ x mol(-1). The produce layers obstruct the forward reaction of the dissolution of Mg2+.
浸出是水镁蛇纹石尾矿回收技术中最重要的步骤。这一步骤能够将有价值的金属镁与硅及其他杂质金属分离。研究了硫酸对水镁蛇纹石尾矿中镁浸出效率的影响。为了获得浸出行为，基于实验数据使用改进的未反应收缩核模型来确定溶解动力学参数。该模型具有显著性，表明水镁蛇纹石尾矿中Mg2+的溶解受产物层扩散控制，表观活化反应能E = 34.04 kJ·mol(-1)。产物层阻碍了Mg2+溶解的正向反应。
