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| Research on Process and Kinetics of Iron Removal from Zinc Hydrometallurgy Solution by Ozone Oxidation |
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Received:May 24, 2023
Revised:May 31, 2023
Accepted:June 05, 2023
Published Online:September 04, 2023
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| DOI：doi：10.3969/j.issn.1007-7545.2023.10.003 |
| KeyWord:ozone oxidation; iron removal; kinetics; activation energy; zinc hydrometallurgy |
| Author | Institution |
| ZHANG Lihua |
昆明理工大学 |
| ZHANG Jiale |
昆明理工大学 |
| YANG Siqi |
昆明理工大学 |
| BAI Xiwei |
昆明理工大学 |
| YAO Hao |
昆明理工大学 |
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| Abstract: |
| The experimental and kinetic studies were conducted for Fe2+ removal from zinc hydrometallurgy solution using ozone as strong oxidant and ZnO as neutralizing agent.The effects of initial Fe2+ concentration, pH value of solution, reaction temperature and ozone flow rate on efficiency and velocity of iron removal were investigated. The results show that the velocity of iron removal rises with the enhancement of pH value, temperature and ozone flow rate, but drops with increase of initial Fe2+ concentration. The commonly used pseudo first-order, pseudo second-order, Higbie and Avrami kinetic equations were adapted and compared, the kinetics results show that iron removal by ozone oxidation and precipitation follows the pseudo first-order reaction and is controlled by diffusion with apparent activation energy of 28.57 kJ/mol. The kinetic equation is r_(Fe^(2+) )=8.22[Fe^(2+) 〖]_0〗^(-0.74) [H^+ ]^(-0.51) Q_(O_3)^1.89 exp?〖(-3436/T〗). |
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