Enhancement effects of distiller's dried grains as reducing agents on the kinetics and leaching of pyrolusite from manganese ore
| Autor: | Dongjie Liu, Lei Gao, Guo Chen, Junwen Zhou, Shenghui Guo, Mamdouh Omran, Jin Chen |
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| Jazyk: | angličtina |
| Rok vydání: | 2022 |
| Předmět: | |
| Zdroj: | Journal of Materials Research and Technology, Vol 19, Iss , Pp 4270-4281 (2022) |
| Druh dokumentu: | article |
| ISSN: | 2238-7854 37116002 |
| DOI: | 10.1016/j.jmrt.2022.07.005 |
| Popis: | To solve the problem of environmental pollution, Distiller's dried grains (DDGS), a biomass, is used as a clean reducing agent for the leaching process of pyrolusite. Experimental results have shown that the leaching rate of manganese can reach 92.1% with the optimized conditions including a sulfuric acid concentration of 3.5 mol/L, a DDGS to pyrolusite ratio of 0.4, a liquid–solid ratio of 3 mL/g, a temperature of 363K, a time of 3 h, and a rotation speed of 400 rpm. This article explored the mechanism of the entire leaching process: the crude fiber in DDGS is hydrolyzed into reducing sugars, and the MnO2 in pyrolusite undergoes an oxidation–reduction reaction to generate Mn2+ and studied the kinetics of the leaching process following the unreacted shrinkage nuclear reaction model controlled by the surface chemical reaction (1-(1-X)1/3 = kt). The equation of leaching kinetics is 1−1−X13=3738.06·[H2SO4]0.57·[LS]0.78·[DDGSpyrolusite]0.25·[rpm]0.09·exp(−48.448/(RT)) This work provides a green and effective leaching process for the leaching of pyrolusite. |
| Databáze: | Directory of Open Access Journals |
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