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| Synergic Reductive Leaching of Manganese from Low-grade Oxide Manganese Ore with Formaldehyde and Iron Powder |
| Received:March 18, 2015 Revised:March 23, 2015 |
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| DOI：doi：10.3969/j.issn.1007-7545.2015.10.007 |
| KeyWord:formaldehyde; iron powder; manganese oxide ore; synergic leaching |
| Author | Institution |
| LU You-zhi |
广西民族大学化学化工学院 |
| MA Hua-ju |
桂林理工大学南宁分校 |
| CHEN Dong-lian |
桂林理工大学南宁分校 |
| MING Xian-quan |
中信大锰矿业有限责任公司 |
| LI Wei-jian |
中信大锰矿业有限责任公司 |
| YUAN Ai-qun |
广西民族大学化学化工学院 |
| WEI Dong-ping |
广西民族大学化学化工学院 |
| TNAG Ya-fang |
广西民族大学化学化工学院 |
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| Abstract: |
| Manganese oxide ores were synergic reductive leached in sulfuric acid medium with formaldehyde and iron powder as reductant. The effects of reductant dosage, volume fraction of sulfuric acid, reaction time, leaching temperature, ratio of liquid to solid (L/S), and stirring rate on manganese extraction rate, mass concentrations of iron and formic acid in lixivium were studied. Technology parameters were optimized by response surface methodology. The results show that manganese leaching rate is 98.04%, and mass concentrations of iron and formic acid in lixivium is 13.96 mg/mL and 1.40 mg/mL respectively under the optimum conditions including volume fraction of sulfuric acid of 15%, 90% of theoretical amount of formaldehyde, CH2O/Fe mole ratio of 2, reaction time ratio of 2, total leaching time of 2.93 h, leaching temperature of 85 ℃, L/S=6, and stirring rate of 150 r/min. |
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