FeCl_3-HCl—C_2Cl_4体系浸出硫化锌矿的动力学研究

Study on Leaching Kinetics of Zinc Sulfide Minerals in FeCl_3-HCl—C_2Cl_4 System

针对FeCl3-HCl-C2Cl4体系浸出硫化锌精矿过程,建立了以固体产物层扩散控制和混合扩散控制浸出的核收缩动力学模型。动力学研究和浸出过程矿粒表面的SEM分析结果表明,在相同的搅拌强度下,FeCl3-HCl体系符合固体产物层扩散控制的核收缩过程,四氯乙烯能有效地溶解矿粒表面形成的固体硫层,提高固体产物层扩散控制的速度,并且随四氯乙烯加入量的增大;对于FeCl3-HCl-C2Cl4体系则由固体产物层扩散控制变为混合扩散控制的的核收缩过程,显著地提高了浸出速率。

Aiming at the leaching of zinc sulfide minerals in FeCl3-HCl—C2Cl4 system, the leaching kinetic models of solid layer diffusion control and mixing control diffusion have been derived. At the same stirring intensity, it was showed by the kinetic models and SEM analytical results of mineral surface that the leaching in FeCl3-HCl system accords with the kinetic model of solid layer diffusion control, and tetrachloroethylene(C2Cl4) is an effective organic solvent for sulphur layer of mineral particles for speeding up the diffusion; and in FeCl3-HCl-C2Cl4 system it can turn the kinetic model of solid layer diffusion control into mixing diffusion control with the increase of volume of tetrachloroethylene, so that the rate of leaching is accelerated remarkably.