Nitric Acid Leaching Behavior of Manganese Tailings and Catalytic Performance of Leaching Products
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 NH3-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.
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