Reductive leaching of manganese from low-grade pyrolusite ore in sulfuric acid using pyrolysis-pretreated sawdust as a reductant  

作　　者：Ya-li Feng Shi-yuan Zhang Hao-ran Li 

机构地区：[1]School of Civil and Environmental Engineering, University of Science and Technology Beijing [2]National Key Laboratory of Biochemical Engineering, Institute of Process Engineering, Chinese Academy of Sciences

出　　处：《International Journal of Minerals,Metallurgy and Materials》2016年第3期241-246,共6页矿物冶金与材料学报（英文版）

基　　金：financially supported by the China Ocean Mineral Resource Research and Development Association (No. DY125-15-T-08);the National Key Technology Research and Development Program of China (No. 2012BAB07B05);the National High Technology Research and Development Program of China (No. 2012AA062401);the National Natural Science Foundation of China (Nos. 21176242 and 21176026)

摘　　要：Manganese （Mn） leaching and recovery from low-grade pyrolusite ore were studied using sulfiaric acid （H2SO4） as a leachant and pyrolysis-pretreated sawdust as a reductant. The effects of the dosage of pyrolysis-pretreated sawdust to pyrolusite ore, the concentration of sulfuric acid, the liquid/solid ratio, the leaching temperature, and the leaching time on manganese and iron leaching efficiencies were inves- tigated. Analysis of manganese and iron leaching efficiencies revealed that a high manganese leaching efficiency was achieved with low iron extraction. The optimal leaching efficiency was determined to be 20wt% pyrolysis-pretreated sawdust and 3.0 mol/L H2SO4 using a liq- uid/solid ratio of 6.0 mL/g for 90min at 90℃. Other low-grade pyrolusite ores were tested, and the results showed that they responded well with manganese leaching efficiencies greater than 98%.Manganese （Mn） leaching and recovery from low-grade pyrolusite ore were studied using sulfiaric acid （H2SO4） as a leachant and pyrolysis-pretreated sawdust as a reductant. The effects of the dosage of pyrolysis-pretreated sawdust to pyrolusite ore, the concentration of sulfuric acid, the liquid/solid ratio, the leaching temperature, and the leaching time on manganese and iron leaching efficiencies were inves- tigated. Analysis of manganese and iron leaching efficiencies revealed that a high manganese leaching efficiency was achieved with low iron extraction. The optimal leaching efficiency was determined to be 20wt% pyrolysis-pretreated sawdust and 3.0 mol/L H2SO4 using a liq- uid/solid ratio of 6.0 mL/g for 90min at 90℃. Other low-grade pyrolusite ores were tested, and the results showed that they responded well with manganese leaching efficiencies greater than 98%.

关 键 词：manganese ore treatment PYROLUSITE SAWDUST pyrolysis leaching MANGANESE 

分 类 号：TF792[冶金工程—钢铁冶金]