In-situ sulfuric acid roasting leaching of low grade pyrolusite and element separation
TENG Fei1,2,3, LUO Shao-hua2,3, KANG Xue2,3, ZHAI Yu-chun1, LIANG Jin-sheng4, DUAN Xin-hui4
1. School of Metallurgy, Northeastern University, Shenyang 110819, Liaoning, China; 2. School of Resources and Materials, Northeastern University at Qinhuangdao, Qinhuangdao 066004, Hebei, China; 3. Qinhuangdao Key Laboratory of Resources Cleaner Conversion and Efficient Utilization, Qinhuangdao 066004, Hebei, China; 4. Manufacturing Innovation Center for Solid Waste Resource Utilization and Ecological Development Hebei University of Technology, Tianjin 300130, China
Abstract：A new method was studied for extracting manganese from low-grade pyrolusite with H2SO4 roasting and subsequent water leaching. Taking the extraction rate of manganese and iron as the index, through the orthogonal test, the most suitable roasting condition for extracting manganese was determined as follows: acid-ore ratio 2∶1, roasting temperature 650 ℃, water-acid ratio 0.2∶1, roasting time 4 h. The effects of stirring speed, dissolution temperature, dissolution time and dissolution liquid-solid ratio on the extraction rate of Mn and Fe were further studied, the optimum conditions for the dissolution test were determined as follows: stirring speed 300 r/min, dissolution temperature 90 ℃, dissolution time 50 min, dissolution liquid-solid ratio 6∶1. Under this condition, the maximum extraction of Mn reached 98.16%, and the minimum extraction of Fe was 0.87%, which realized the efficient extraction of Mn from low-grade pyrolusite and the effective separation of Mn from Fe and Si.
LIU B B, ZHANG Y B, LU M M, et al. Extraction and separation of manganese and iron from ferruginous manganese ores: A review[J]. Minerals Engineering, 2019, 131:286.
XIN B P, LI T, LI X, et al. Reductive dissolution of manganese from manganese dioxide ore by autotrophic mixed culture under aerobic conditions[J]. Journal of Cleaner Production, 2015, 92:54.
[4]
张君. 电解金属锰产业前景展望[J]. 中国冶金, 2007, 17(12):1.
[5]
SUN W Y, SU S J, WANG Q Y, et al. Lab-scale circulation process of electrolytic manganese production with low-grade pyrolusite leaching by SO2[J]. Hydrometallurgy, 2013, 133(2):118.
LI K Q, CHEN J, PENG J H, et al. Pilot-scale study on enhanced carbothermal reduction of low-grade pyrolusite using microwave heating [J]. Powder Technology, 2020, 360:846.
[8]
YOU Z X, LI G H, ZHANG Y B, et al. Extraction of manganese from iron rich MnO2 ores via selective sulfation roasting with SO2 followed by water leaching [J]. Hydrometallurgy, 2015, 156:225.
[9]
SUN W Y, SU S J, WANG Q Y, et al. Lab-scale circulation process of electrolytic manganese production with low-grade pyrolusite leaching by SO2[J]. Hydrometallurgy, 2013, 133:118.
[10]
TANG Q, ZHONG H, WANG S, et al. Reductive leaching of manganese oxide ores using waste tea as reductant in sulfuric acid solution [J]. Transactions of Nonferrous Metals Society of China, 2014, 24:861.
[11]
LAN J R, SUN Y, DU Y G, et al. Environmentally-friendly bioleaching of manganese from pyrolusite: Performance and mechanisms [J]. Journal of Cleaner Production, 2020, 249:1
2021, Vol. 31 
