School of Petroleum and Environment Engineering;
Yan'an University;
School of Materials Science & Engineering;
Beijing Institute of Technology;
Technology Center for Heavy Metal Cleaner Production Engineering;
Chinese Research Academy of Environmental Sciences;
low-grade; manganese; dioxide; ore; nitrocellulose; acid; wastewater; sulfuric; acid; leaching; Mn; reductive; dissolution; electrolytic; manganese; metal;