Kinetics and mechanism of sphalerite leaching by sodium nitrate in sulphuric acid solution

2012
Authors
Sokić, Miroslav
Marković, Branislav

Matković, Vladislav
Živković, Dragana

Štrbac, Nada

Stojanović, Jovica

Article (Published version)
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Interest for application of hydrometallurgical processes in a processing of complex sulphide ores and concentrates has increased in recent years. Their application provides better metal recoveries and reduced emission of gaseous and toxic ageneses in the environment. The kinetics and mechanism of sphalerite leaching from complex sulphide concentrate with sulphuric acid and sodium nitrate solution at standard conditions was presented in this paper. The influences of temperature and time on the leaching degree of zinc were investigated and kinetic analysis of the process was accomplished. With temperature increasing from 60 to 90oC, the zinc leaching increased from 25.23% to 71.66% after 2 hours, i.e. from 59.40% to 99.83% after 4 hours. The selected kinetic model indicated that the diffusion through the product layer was the rate-controlling step during the sphalerite leaching. The activation energy was determined to be 55 kJ/mol in the temperature range 60-90oC. XRD, light microscopy a...nd SEM/EDX analyses of the complex concentrate and leach residue confirmed formation of elemental sulphur and diffusion-controlled leaching mechanism.
Keywords:
sulphuric acid / sphalerite leaching / sodium nitrate / mechanism / kineticsSource:
Journal of Mining and Metallurgy Section B-Metallurgy, 2012, 48, 2, 185-195Publisher:
- Univerzitet u Beogradu - Tehnički fakultet u Boru, Beograd
Funding / projects:
DOI: 10.2298/JMMB111130022S
ISSN: 1450-5339
WoS: 000310129700003
Scopus: 2-s2.0-84866773056
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Institut za tehnologiju nuklearnih i drugih mineralnih sirovinaTY - JOUR AU - Sokić, Miroslav AU - Marković, Branislav AU - Matković, Vladislav AU - Živković, Dragana AU - Štrbac, Nada AU - Stojanović, Jovica PY - 2012 UR - https://ritnms.itnms.ac.rs/handle/123456789/213 AB - Interest for application of hydrometallurgical processes in a processing of complex sulphide ores and concentrates has increased in recent years. Their application provides better metal recoveries and reduced emission of gaseous and toxic ageneses in the environment. The kinetics and mechanism of sphalerite leaching from complex sulphide concentrate with sulphuric acid and sodium nitrate solution at standard conditions was presented in this paper. The influences of temperature and time on the leaching degree of zinc were investigated and kinetic analysis of the process was accomplished. With temperature increasing from 60 to 90oC, the zinc leaching increased from 25.23% to 71.66% after 2 hours, i.e. from 59.40% to 99.83% after 4 hours. The selected kinetic model indicated that the diffusion through the product layer was the rate-controlling step during the sphalerite leaching. The activation energy was determined to be 55 kJ/mol in the temperature range 60-90oC. XRD, light microscopy and SEM/EDX analyses of the complex concentrate and leach residue confirmed formation of elemental sulphur and diffusion-controlled leaching mechanism. PB - Univerzitet u Beogradu - Tehnički fakultet u Boru, Beograd T2 - Journal of Mining and Metallurgy Section B-Metallurgy T1 - Kinetics and mechanism of sphalerite leaching by sodium nitrate in sulphuric acid solution EP - 195 IS - 2 SP - 185 VL - 48 DO - 10.2298/JMMB111130022S UR - conv_633 ER -
@article{ author = "Sokić, Miroslav and Marković, Branislav and Matković, Vladislav and Živković, Dragana and Štrbac, Nada and Stojanović, Jovica", year = "2012", abstract = "Interest for application of hydrometallurgical processes in a processing of complex sulphide ores and concentrates has increased in recent years. Their application provides better metal recoveries and reduced emission of gaseous and toxic ageneses in the environment. The kinetics and mechanism of sphalerite leaching from complex sulphide concentrate with sulphuric acid and sodium nitrate solution at standard conditions was presented in this paper. The influences of temperature and time on the leaching degree of zinc were investigated and kinetic analysis of the process was accomplished. With temperature increasing from 60 to 90oC, the zinc leaching increased from 25.23% to 71.66% after 2 hours, i.e. from 59.40% to 99.83% after 4 hours. The selected kinetic model indicated that the diffusion through the product layer was the rate-controlling step during the sphalerite leaching. The activation energy was determined to be 55 kJ/mol in the temperature range 60-90oC. XRD, light microscopy and SEM/EDX analyses of the complex concentrate and leach residue confirmed formation of elemental sulphur and diffusion-controlled leaching mechanism.", publisher = "Univerzitet u Beogradu - Tehnički fakultet u Boru, Beograd", journal = "Journal of Mining and Metallurgy Section B-Metallurgy", title = "Kinetics and mechanism of sphalerite leaching by sodium nitrate in sulphuric acid solution", pages = "195-185", number = "2", volume = "48", doi = "10.2298/JMMB111130022S", url = "conv_633" }
Sokić, M., Marković, B., Matković, V., Živković, D., Štrbac, N.,& Stojanović, J.. (2012). Kinetics and mechanism of sphalerite leaching by sodium nitrate in sulphuric acid solution. in Journal of Mining and Metallurgy Section B-Metallurgy Univerzitet u Beogradu - Tehnički fakultet u Boru, Beograd., 48(2), 185-195. https://doi.org/10.2298/JMMB111130022S conv_633
Sokić M, Marković B, Matković V, Živković D, Štrbac N, Stojanović J. Kinetics and mechanism of sphalerite leaching by sodium nitrate in sulphuric acid solution. in Journal of Mining and Metallurgy Section B-Metallurgy. 2012;48(2):185-195. doi:10.2298/JMMB111130022S conv_633 .
Sokić, Miroslav, Marković, Branislav, Matković, Vladislav, Živković, Dragana, Štrbac, Nada, Stojanović, Jovica, "Kinetics and mechanism of sphalerite leaching by sodium nitrate in sulphuric acid solution" in Journal of Mining and Metallurgy Section B-Metallurgy, 48, no. 2 (2012):185-195, https://doi.org/10.2298/JMMB111130022S ., conv_633 .