高价态难溶锰资源回转窑还原焙烧技术研究

由于高价锰(MnO2)资源具有难以酸浸,而低价锰(MnO)资源容易酸浸的特点,研究了回转窑还原焙烧技术应用于各类高价态难溶锰矿资源的可行性。试验结果表明,回转窑的动态焙烧试验工艺条件与静态焙烧试验的工艺条件基本一致,回转窑动态焙烧试验在焙烧温度为800℃,焙烧时间为60 min,还原剂用量为15%的条件下,国产低品位锰矿石、电解锰阳极泥锰浸出率分别为94.13%和99.59%;在焙烧温度为950℃,焙烧时间为60 min,还原剂用量为15%的条件下,进口高品位锰矿石锰浸出率为96.59%。表明回转窑还原焙烧工艺适于处理不同种类的高价态锰资源。

Studies on Rotary Kiln Reduction Roasting Technology for the Treatment of High Valence Insoluble Manganese Ore Resources

The high valence manganese resources （MnO₂） have the characteristics of low solubility， while the low valence ones （MnO） are easily dissolved in acidic solution. The feasibility using rotary kiln reduction roasting technology to treat various high valence insoluble manganese resources was studied. The experimental results indicated that the technical conditions of dynamic roasting experiments in a pilot rotary kiln were consistent with that of the static roasting experiments. With the roasting temperature of 800 ℃， the roasting time of 60 min， and reductant dosage of 15%， the leaching efficiency of manganese from the domestic low-grade manganese and electrolytic manganese anode mud were 94.13% and 99.59%， respectively； With the roasting temperature was 950 ℃， the roasting time was 60 min， and the reductant dosage was 15%， the leaching efficiency of manganese from the imported high-grade manganese was 96.59%. The results confirmed that rotary kiln reduction roasting technology was adoptable for the treatment of different types of high valence manganese resources.