Dissolution kinetics of low grade complex copper ore in ammonia-ammonium chloride solution

The leaching kinetics of Tang-dan refractory low grade complex copper ore was investigated in ammonia-ammonium chloride solution.The concentration of ammonia and ammonium chloride,the ore particle size,the solid-to-liquid ratio and the temperature were chosen as parameters in the experiments.The results show that temperature,concentration of ammonia and ammonium chloride have favorable influence on the leaching rate of copper oxide ores.But,leaching rate decreases with increasing particle size and solid-to-liquid ratio.The leaching process is controlled by the diffusion of the lixiviant and the activation energy is determined to be 23.279 kJ/mol.An equation was also proposed to describe the leaching kinetics.

钙芒硝矿溶浸开采技术进展与展望

简要回顾了钙芒硝矿开采的技术历程,重点介绍了现今应用最为广泛的就地破碎溶浸方法,分析了其优缺点,叙述了群井致裂压力溶浸开采方法的试验情况。详细论述了钙芒硝矿溶浸开采的研究情况,总结了现有研究的不足。综合分析得出:现有水溶工艺缺陷明显,导致溶浸周期长、资源回收率低,同时资源不能综合利用。认为应寻求一种溶浸效率高、可资源综合利用的化学溶浸液,加强溶浸理论研究,探明多因素对溶浸效果的影响,开发出经济合理的化学改性浸出方法。