锰尾矿的硝酸浸出行为及浸出产物催化性能研究

Nitric Acid Leaching Behavior of Manganese Tailings and Catalytic Performance of Leaching Products

研究了利用低品位锰尾矿制备高效的锰基和沸石基NH 3-SCR催化剂,以实现固废资源化利用和低温烟气氮氧化物的有效控制。采用单因素法和响应曲面法优化了硝酸初始浓度、液固体积质量比、浸出温度和浸出时间等工艺参数,并对浸出产物所制备的催化剂进行催化性能测试。结果表明:在优化工艺条件下,锰浸出率达98%;锰基和沸石基NH 3-SCR催化剂在200~350℃温度范围内脱硝性能优异,NO转化率最高达98%。通过合理优化浸出工艺参数,可实现低品位锰尾矿的高效利用,并制备出具有显著脱硝效果的催化剂,该催化剂在工业应用中具有广阔前景。

In order to realize resource utilization of solid waste and effective control of nitrogen oxides in low-temperature flue gas,the preparation of high efficiency manganese and zeolite NH 3-SCR catalysts from low-grade manganese tailings was studied.The initial concentration of nitric acid,liquid volume to solid mass ratio,leaching temperature and leaching time were optimized by single factor method and response surface method.The catalytic performance of the catalyst prepared by the leaching products was tested.The results show that under the optimum conditions,the manganese leaching rate reaches 98%.The catalyst has excellent denitrification performance in the temperature range of 200~350℃,and the conversion rate of NO reaches 98%.By optimizing the leaching process parameters,the high efficiency utilization of low-grade manganese tailings can be realized,and the catalyst with remarkable denitrification effect can be prepared,which has broad prospects in industrial application.