Effect and mechanism of Molar Ratio of C2O42- to Fe3+ on preparation of
Fe-MnC2O4 using iron-rich pyrolusite
Abstract
Ferric and manganese oxalate complex can be obtained from iron-rich
pyrolusite by oxalic acid leaching and ultraviolet radiation. Molar
ratio of C2O42- to Fe3+ in leaching solution was found to be a vital
parameter decided the leaching and precipitation efficiencies of Mn and
Fe in leaching and radiation processes. Even at the optimal leaching
concentration of experiments, the Fe leaching rate reached 94.24%,
while the leaching rate of Mn was only 69.04%. When a two-stage
countercurrent leaching process was carried out, both Fe and Mn leaching
rates could reach 97.10% and nearly 100%, respectively, realizing
efficient leaching of Fe and Mn from pyrolusite.