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| Reductive Leaching of Manganese from Low-grade Pyrolusite with Formic Acid in Nitric Acid System |
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Received:May 11, 2014
Revised:May 13, 2014
Accepted:May 16, 2014
Published Online:October 15, 2014
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| DOI：10.3969/j.issn.1007-7545.2014.11.002 |
| KeyWord:pyrolusite; formic acid; response surface methodology; reduction |
| Author | Institution |
| LU You-zhi |
广西民族大学化学化工学院 |
| MA Shao-mei |
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 |
| YUAN Ai-qun |
广西民族大学化学化工学院 |
| HUANG Bao-ying |
广西民族大学化学化工学院 |
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| Abstract: |
| Pyrolusite was leached in nitric acid system with formic acid as reductant. The effects of dosage of formic acid, concentration of nitric acid, ratio of liquid to solid (L/S), reaction time, and reaction temperature on leaching rate of Mn, Fe, and Al by single-factor experiments and response surface methodology. The results show that the main influence factors on manganese leaching rate in sequence is L/S, concentration of nitric acid, leaching time and reaction temperature when dosage of formic acid is certain. The extraction rates of Mn, Fe, and Al is 91.01%, 43.06% and 21.61%, respectively under the optimum conditions including dosage of formic acid of 3 mL, nitric acid concentration of 0.45 mol/L, L/S of 5.6, leaching temperature of 90 ℃, and leaching time of 2.5 h. |
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