CuO氯化过程动力学研究

铜渣中含有30 %~40 %的Fe, 对铜渣中的Fe进行回收, 有利于缓解中国依赖进口铁矿石的压力.基于热力学分析氯化除铜的可行性, 在823 K、873 K、923 K、973 K温度下, 通过热重分析研究CuO-FeCl₂体系的氯化过程动力学, 并考察反应温度和Ar气流量对反应的影响: CuO-FeCl₂体系的氯化率随温度的升高而增大, 当Ar流量为50 mL/min时, 氯化率达到最大值为62.46 %.通过推导氯化反应动力学公式, 确定CuO-FeCl₂体系的氯化反应为0级反应, 并且在873 K时由氯化过程动力学区过渡到扩散区, 动力学区的反应速率取决于CuCl₂的挥发速率, 扩散区的反应速率取决于FeCl₂向CuO表面扩散的速率. 

Kinetics of chlorination process of copper oxide

Recycling Fe elements from copper slag is beneficial to decrease the pressure on Chinese dependence on imported iron ore for the content of iron element in copper slag is as high as 30 %~40 %. The feasibility of copper chlorination was analyzed by performing thermogravimetric analysis on the chlorination process of CuO-FeCl₂ system at temperatures of 823 K, 873 K, 923 K and 973 K respectively. The influences of temperature and flow rate of argon gas in CuO-FeCl₂ system on the reaction were discussed. The results show that chlorination rate increases with rising temperature. At the condition of 50 mL/min of argon flow rate, chlorination rate reaches a maximum of 62.46 % in CuO-FeCl₂ system. The chlorination reaction of the system is determined to be zero order reaction by deriving kinetic equation of chlorination, and the system transited from chlorination kinetic region to diffusion region at 873 K. The reaction rate in kinetic region depends on CuCl₂ evaporation rate, and the reaction rate of diffusion region depends on the rate of surface diffusion from FeCl₂ to CuO.