含铜硫酸渣中铜的浸出及浸出动力学分析

为了研究黄铁矿经高温焙烧制取硫酸后产生的铜品位为0.87%硫酸渣的铜浸出动力学规律,采用X射线衍射分析等方法分析了矿石的性质,研究了矿石粒度、初始酸浓度、液固比、搅拌速率、浸出温度和浸出时间等因素对硫酸渣矿样中铜浸出的影响,采用未反应收缩核模型对硫酸渣浸出过程进行动力学分析。结果表明,各因素对硫酸渣铜浸出的浸出率有较大影响;从浸出过程控制模型、浸出动力学方程、浸出反应表观活化能方面确定了硫酸渣浸出过程的主要控制步骤为内扩散过程控制,得出浸出反应的表观活化能Ea=19.96 kJ/mol。

Leaching and Its Kinetics of Copper Ore from Sulfuric Acid Slag

In order to study the kinetics of copper leaching from pyrite cinder containing 0.87% sulfuric acid after being roasted at high temperature, the chemical properties of ore were analyzed by X-ray diffraction and other methods. The effects of ore particle size, initial acidity, liquid-solid ratio, stirring rate, leaching temperature and leaching time on copper leaching in sulfuric acid slag samples were studied experimentally. The unreacted shrinking nucleus model is used to analyze the kinetics of the sulfuric acid slag leaching process. The results show that all factors have a great influence on the leaching rate of copper leaching of sulfuric acid slag; based on the leaching process control model, leaching kinetic equation, leaching reaction appearance in terms of activation energy, the main control step of determining the slag leaching process is internal diffusion reaction controls, and the apparent activation energy of the leaching reaction is Ea=19.96 kJ/mol.