Abstract：The leaching behaviors of a reduction manganese oxide ores with manganese magnetite phase from the demonstration plant in Yunnan Province were presented. The effects and influence of sulfuric acid concentration, leaching time, leaching temperature on Mn leaching rate and residual acid were investigated. The results show that only at a relatively higher acid concentration condition, the manganese magnetite phase can maintain a fast leach rate. A two-stage countercurrent leaching technology is applied, the first stage leached manganese monoxide phase with sulfuric acid concentration of 48.02 g/L and the second stage with sulfuric acid concentration of 76.44 g/L.Compared with the one-stage leaching process, the leaching rate of manganese in the two-stage leaching process increases from82.31% to 92.17%, and the acid consumption (acid to ore ratio) decreased from 0.55 to 0.50.

Keywords: manganese magnetite phase; manganese oxide ore; two-stage countercurrent

第一作者简介：邵国强（1986—），男，硕士，助理研究员，研究方向为矿产资源高效利用。E-mail：280416590@qq.com。

通信作者简介：朱庆山（1969—），男，博士，研究员，博士生导师，研究方向为纳微粉体结构调控、矿产资源高效利用、流态化过程强化等。E-mail：qszhu@home.ipe.ac.cn。