硫酸锰热解制备Mn_2O_3以及用热解尾气浸出低品位软锰矿的实验研究  

Preparation of Mn_2O_3 by Thermal Decomposition of MnSO_4 Combined with Reductive Leaching of Low-grade Pyrolusite Using the Decomposition Gas

作　　者：申武[1] 廖兵[1] 孙维义[1] 丁桑岚[1] 苏仕军[1] 

机构地区：[1]四川大学建筑与环境学院,四川成都610065

出　　处：《四川大学学报（工程科学版）》2014年第2期177-181,共5页Journal of Sichuan University (Engineering Science Edition)

基　　金：国家自然科学基金资助项目(51374150;51304140);四川省杰出青年基金资助项目(2011JQ0008);四川大学博士后基金资助项目

摘　　要：用硫酸锰(MnSO4)高温热解的方法制备了Mn2O3,并考察了热解制备过程中产生的尾气浸出低品位软锰矿的可行性。热解实验表明,850℃是硫酸锰热解制备Mn2O3的最佳温度。硫酸锰在850℃热解所得Mn2O3产品的锰含量为68.93%。产品的XRD和FTIR表征结果表明,热解产物为单一相的立方体结构Mn2O3。尾气测定结果表明,硫酸锰热解制备Mn2O3时释放出的尾气中含有SO2和SO3,两者摩尔比约为7∶1。浸出实验结果表明利用热解尾气浸出软锰矿是可行的。在温度为60℃,初始硫酸浓度为0.1 mol/L时,尾气中SO x(SO2和SO3)的吸收率达到99.73%,软锰矿的锰浸出率达到94.37%。该工艺不仅可以避免液相制备方法中废水的问题,还可以使得热解制备过程产生的尾气和低品位软锰矿同时得到资源化利用。Dimanganese trioxide （ Mn2O3 ） was prepared by thermal decomposition of manganese sulfate （ MnSO4 ）. Decomposition gas released during the Mn2O3 preparation was used to leach pyrolusite ore. The thermal decomposition of MnSO4 showed that 850 ℃ was the best temperature for Mn2O3 preparation. Characterization results with XRD and FUR showed that the decomposition product at 850℃ was single phase cubic Mn2O3 with manganese content of 68.93%. SO2 and SO3 were both observed in the decomposition gas with mole ratio of about 7, indicating the majority of SO2 in the decomposition gas. The extraction experiment showed that the extraction of pyrolusite using decomposition gas was entirely feasible. At 60 ℃ and with 0.1 mol/L initial H2SO4 ,the SO, absorption efficiency and Mn extraction rate reached separately 99.73% and 94.37%. The presented technology cauld only avoid the wastewater problem which always involves in liquid-phase methods, but also realize the simultaneous resource recovery of decomposition gas and low-grade pyrolu- site.

关 键 词：三氧化二锰(Mn2O3) 硫酸锰 热解尾气 软锰矿 资源化 

分 类 号：TQ137.1[化学工程—无机化工]