Abstract
In this paper, the kinetics of oxygen pressure acid leaching of marmatite was studied in the low-temperature region (383–413 K). The effects of agitation rate, particle size, temperature, H2SO4 concentration and oxygen partial pressure on the conversion of sulphur (S2− → S0) were investigated. The results showed that the conversion ratio increased with increasing agitation rate, temperature and oxygen partial pressure, and with decreasing particle size and H2SO4 concentration. Moreover, the results demonstrated that sulphur conversion was controlled by an interfacial chemical reaction, with an apparent activation energy of 51.17 kJ mol−1. The calculated reaction orders of sulphuric acid and oxygen were 0.48 and 1.01, respectively. The leaching reaction followed an unreacted shrinking core model. A model kinetic equation was established for sulphur conversion. Orthogonal experiments regarding the acid balance () of the oxygen pressure leaching residue were carried out. Variance analysis showed that temperature had the largest influence on this, so the effect of the temperature region (383–443 K) on acid balance was further investigated. When the temperature exceeded 443 K, the increase in the sulphur oxidation ratio was too large, which tended to increase the acidity of the system.
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
