不同品质黄铁矿-生物浸出液制剂浸出软锰矿研究

摘要

Two different grades of pyrite were subjected to bioleaching process with acidophilic iron and sulfur oxidizers, from which several kinds of leachate were obtained from different processing stages, and then together with pyrite used to leach both high⁃and low⁃grade of pyrolusite in the experiment. It is found that factors, including the microorganism⁃pyrite leachate from different stages, grade of pyrite and manganese leaching temperature, all have influences on the manganese leaching rate. The microorganism⁃pyrite leachate obtained on the 8th day and 6th day were both used as an additive in the leaching of two kinds of manganese ores, with the resulted manganese leaching rate and manganese grade compared with each other. It is found that manganese leaching rate from two kinds of manganese ores by using 8th day leachate is 1.73 times and 2.4 times as much as that by using 6th day leachate, with manganese grade of 7% and 25%, respectively . High⁃grade pyrite and its bioleaching leachate in the leaching process could lead to higher Mn recovery rate from high⁃grade pyrolusite and vice versa. Increasing reaction temperature could significantly improve Mn leaching rate, with the leaching rate at 90 ℃ being 2 times of that at 30 ℃. Bioleaching leachate has promoted Mn recovery rate by providing high ORP and low pH environment for simultaneous leaching of pyrite and pyrolusite.%以两种品质不同的黄铁矿经嗜酸铁、硫氧化微生物菌群浸出形成的不同时期浸出液为添加剂，分别对高、低两种品位的软锰矿与黄铁矿进行了共浸出研究。结果表明，微生物⁃黄铁矿浸出液的浸出时期，黄铁矿的品质和浸锰反应温度都会影响锰浸出率。第8天生物⁃黄铁矿浸出液添加剂对两种锰矿中锰的浸出率分别是第6天的1．73倍（品位7％）和2．4倍（品位25％）。高品质黄铁矿体系在处理高品位锰矿时的效果要优于低品质黄铁矿，反之亦然。浸锰反应温度对浸出效率的影响最为显著，90℃下各个体系锰浸出率均高出30℃体系1倍以上。黄铁矿⁃微生物浸出液添加剂通过提供高ORP环境和酸性环境提高黄铁矿⁃软锰矿浸出系统中黄铁矿还原态离子的溶出达到提高锰浸出率的作用，反应温度可以明显加速这个过程。