2种回转窑工艺还原低品位软锰矿的效果评价  

Effect of Products from Two Rotary Kiln Processes on Reduction of Low Grade Pyrolusite Ore

作　　者：卢国贤 袁爱群[2] 周泽广[2] 黄增尉[2] 韦冬萍[2] 马少妹[2] 

机构地区：[1]中信大锰矿业有限责任公司,广西南宁530029 [2]广西民族大学化学化工学院化学与生物转化过程新技术重点实验室,广西南宁530006

出　　处：《中国锰业》2014年第3期25-29,共5页China Manganese Industry

摘　　要：用XRD、SEM和化学分析等方法对2种回转窑工艺还原低品位软锰矿的产物进行表征,同时结合硫酸浸出试验,考察锰、铁和铝的浸出差异。结果表明：改进回转窑工艺的产品中锰的还原率可达到93%以上,原回转窑工艺锰的还原率为50%~90%。常温常压时在较佳浸出条件下,酸矿比0.55∶1、液固比5∶1、时间40 min、搅拌速度300 r/min,改进回转窑工艺使锰的浸出率达94.1%,高于原回转窑工艺的产品,而铁、铝的浸出率则相对较低,分别是33.6%和26.3%。将回转窑中的燃烧室和还原室分离有利于提高锰的还原率,改进回转窑工艺产品中锰、铁、铝的存在形态,而颗粒表面粗糙、带小孔有裂纹的形貌具有较大比表面积,有利于提高锰的浸出率。The products of two rotary kiln processes on the reduction of low grade pyrolusite ore were characterized by XRD, SEM and chemical analysis. Leaching difference of manganese, iron and aluminum were investigated by sulfuric acid leaching experiment. The results show that manganese reduction rate of improved rotary kiln processes can reach above 93%, but the original one is 50% -90%. Under ordinary temperatures and pressures, the optimum leaching conditions read as follows, sulphuric acid： pyrolusite ore = 0.55： 1, liquid-solid ratio 5： 1, stirring speed 300 r/min, leaching time 40 min. Finally, leaching rate of manganese reached of improved rotary kiln processes is 94.1%, which is higher than that of the original rotary kiln process. But the lower leaching rate of iron, aluminum is 33.6%, 26.3% respectively. The separation of combustion chamber and the reduction chamber in rotary kiln are helpful to improve reduction percent of manganese. Both speciation of manganese, iron, aluminum and the rough surface with small hole giving larger specific surface area contribute to the higher leaching rate of manganese, lower leaching rate of manganese iron, aluminum.

关 键 词：回转窑 低品位软锰矿 还原焙烧 浸出 

分 类 号：TF803.1[冶金工程—有色金属冶金] TF551