Direct Acid Leaching of Sphalerite: An Approach Comparative and Kinetics Analysis
The present work reports the direct leaching of zinc from a sphalerite concentrate in acid media. Lab-scale and pilot-scale experiments were conducted in atmospheric-pressure and low-pressure reactors, respectively. Leaching of zinc and precipitation of iron was achieved in the same stage using diff...
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2020-04-01
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author | Nallely G. Picazo-Rodríguez Ma. de Jesus Soria-Aguilar Antonia Martínez-Luévanos Isaias Almaguer-Guzmán Josue Chaidez-Félix Francisco Raul Carrillo-Pedroza |
author_facet | Nallely G. Picazo-Rodríguez Ma. de Jesus Soria-Aguilar Antonia Martínez-Luévanos Isaias Almaguer-Guzmán Josue Chaidez-Félix Francisco Raul Carrillo-Pedroza |
author_sort | Nallely G. Picazo-Rodríguez |
collection | DOAJ |
description | The present work reports the direct leaching of zinc from a sphalerite concentrate in acid media. Lab-scale and pilot-scale experiments were conducted in atmospheric-pressure and low-pressure reactors, respectively. Leaching of zinc and precipitation of iron was achieved in the same stage using different reagents like Fe<sup>3+</sup>, O<sub>2</sub>, O<sub>3</sub>, and Fe<sup>2+</sup> (which is continuously oxidized in the leaching solution by H<sub>2</sub>O<sub>2</sub> and O<sub>2</sub>). The highest percentage of zinc extraction (96%) was obtained in pilot-scale experiments using H<sub>2</sub>SO<sub>4</sub>, Fe<sup>2+</sup>, and O<sub>2</sub>. Experimental results were compared with those of other researchers to provide a better understanding of the factors influencing the dissolution of zinc. In the first instance, it was determined from analysis of variance that leaching time and the use of an oxidant agent (O<sub>2</sub> or O<sub>3</sub>) were the most influential factors during the direct leaching of zinc from the sphalerite concentrate. Kinetic models were also evaluated to determine the rate-limiting step of the sphalerite leaching; it was concluded that the type of the sulfur layer formed in the residue (porous or non-porous) depends on the type of the oxidant used in the leaching media, which determines the dissolution kinetics of zinc. |
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series | Minerals |
spelling | doaj.art-1e29dabbe29849908336bc652025824c2023-11-19T21:53:37ZengMDPI AGMinerals2075-163X2020-04-0110435910.3390/min10040359Direct Acid Leaching of Sphalerite: An Approach Comparative and Kinetics AnalysisNallely G. Picazo-Rodríguez0Ma. de Jesus Soria-Aguilar1Antonia Martínez-Luévanos2Isaias Almaguer-Guzmán3Josue Chaidez-Félix4Francisco Raul Carrillo-Pedroza5Facultad de Ciencias Químicas, Universidad Autónoma de Coahuila, República S/N, C.P 25280 Saltillo, Coahuila, MexicoFacultad de Metalurgia, Universidad Autónoma de Coahuila, Carretera 57 Km 5, C.P 25710 Monclova, Coahuila, MexicoFacultad de Ciencias Químicas, Universidad Autónoma de Coahuila, República S/N, C.P 25280 Saltillo, Coahuila, MexicoCIDT-SEPSA Peñoles, C.P. 27268 Torreon, Coahuila, MexicoCIDT-SEPSA Peñoles, C.P. 27268 Torreon, Coahuila, MexicoFacultad de Metalurgia, Universidad Autónoma de Coahuila, Carretera 57 Km 5, C.P 25710 Monclova, Coahuila, MexicoThe present work reports the direct leaching of zinc from a sphalerite concentrate in acid media. Lab-scale and pilot-scale experiments were conducted in atmospheric-pressure and low-pressure reactors, respectively. Leaching of zinc and precipitation of iron was achieved in the same stage using different reagents like Fe<sup>3+</sup>, O<sub>2</sub>, O<sub>3</sub>, and Fe<sup>2+</sup> (which is continuously oxidized in the leaching solution by H<sub>2</sub>O<sub>2</sub> and O<sub>2</sub>). The highest percentage of zinc extraction (96%) was obtained in pilot-scale experiments using H<sub>2</sub>SO<sub>4</sub>, Fe<sup>2+</sup>, and O<sub>2</sub>. Experimental results were compared with those of other researchers to provide a better understanding of the factors influencing the dissolution of zinc. In the first instance, it was determined from analysis of variance that leaching time and the use of an oxidant agent (O<sub>2</sub> or O<sub>3</sub>) were the most influential factors during the direct leaching of zinc from the sphalerite concentrate. Kinetic models were also evaluated to determine the rate-limiting step of the sphalerite leaching; it was concluded that the type of the sulfur layer formed in the residue (porous or non-porous) depends on the type of the oxidant used in the leaching media, which determines the dissolution kinetics of zinc.https://www.mdpi.com/2075-163X/10/4/359zincsphaleriteleachingstatistickineticssulfur layer |
spellingShingle | Nallely G. Picazo-Rodríguez Ma. de Jesus Soria-Aguilar Antonia Martínez-Luévanos Isaias Almaguer-Guzmán Josue Chaidez-Félix Francisco Raul Carrillo-Pedroza Direct Acid Leaching of Sphalerite: An Approach Comparative and Kinetics Analysis Minerals zinc sphalerite leaching statistic kinetics sulfur layer |
title | Direct Acid Leaching of Sphalerite: An Approach Comparative and Kinetics Analysis |
title_full | Direct Acid Leaching of Sphalerite: An Approach Comparative and Kinetics Analysis |
title_fullStr | Direct Acid Leaching of Sphalerite: An Approach Comparative and Kinetics Analysis |
title_full_unstemmed | Direct Acid Leaching of Sphalerite: An Approach Comparative and Kinetics Analysis |
title_short | Direct Acid Leaching of Sphalerite: An Approach Comparative and Kinetics Analysis |
title_sort | direct acid leaching of sphalerite an approach comparative and kinetics analysis |
topic | zinc sphalerite leaching statistic kinetics sulfur layer |
url | https://www.mdpi.com/2075-163X/10/4/359 |
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