提高硫化铜精矿氧压浸出过程中氧气利用率的策略分析

Technological research on improving the oxygen utilization ratio in the process of oxygen pressure leaching of copper sulfide concentrate

火法炼铜工艺因环保问题受到制约,发展湿法炼铜氧压直接浸出工艺成为关注焦点。本文对氧压浸出过程中氧气利用率的影响因素进行了分析,采用计算流体力学技术对其气液两相流动过程进行了数值模拟,明晰了浸出过程中搅拌桨形状、转速以及液固比对高压釜内氧气浓度分布的影响规律,并通过改变投料速度、液固比以及排气时间等参数,在30 L四隔室卧式高压釜中进行了3组硫化铜精矿氧压浸出工业试验。结果表明:当液固比为8∶1、转速为300 r/min、桨叶形式为双层推进式时,氧气利用率可达到94.1%。

The pyrometallurgical copper smelting process is restricted due to environmental protection issues,and the development of the direct oxygen pressure leaching process has become the focus of attention. The influencing factors of the oxygen utilization rate in the oxygen pressure leaching process was analyzed. The gas-liquid two-phase flow was numerically simulated by the technology of computational fluid dynamics. The effects of the shape of the stirring blade,the rotation speed,and the liquid-solid ratio during the leaching process on the oxygen concentration distribution in the autoclave were clarified. Three sets of copper sulfide concentrate oxygen pressure leaching industrial tests were carried out in a 30 L four-compartment horizontal autoclave by changing the feeding speed,liquidsolid ratio and exhaust time and other parameters. The results show that the oxygen utilization rate can reach 94. 1% when the liquid-to-solid ratio is 8∶ 1,the rotation speed is 300 r/min,and the blade type is double-layer propulsion.