NDLI: A simulation experimental study on oxidative kinetics of sphalerite under hypergene condition

Content Provider	Springer Nature Link
Author	Pan, Ziping Ye, Lin Liu, Tiegeng Cheng, Zengtao Gao, Wei Yang, Yulong
Copyright Year	2012
Abstract	The sphalerite oxidative kinetics under hypergene condition was simulated and studied by means of a mixed flow reactor over a pH range of 1.0–7.8, and at dissolution temperatures from 20 to 55°C, ferric ion concentrations from 1.0×10$^{−5}$ to 1.0×10$^{−2}$ mol/L, O$_{2}$ flux of 0.5 L/min, and oxidants of ferric ion and O$_{2}$. It is indicated that with ferric ion as oxidant, the oxidation rate of sphalerite increases with increasing ferric ion concentration, temperature and decreasing pH value, and under the studied conditions, the dissolution rates of Zn and Cd are approximately identical, with the values of activation energy being 41.75 and 42.51 kJ·mol$^{−1}$, respectively, suggesting that the oxidation rate of sphalerite is controlled by chemical reactions on mineral surface. However, with O$_{2}$ as oxidant, the oxidation mechanism of sphalerite varies with pH value. Oxidation rate decreases with increasing pH value when pH is lower than 5.95, whereas the increase of pH value results in an increase in oxidation rate when pH value is higher than 7. The oxidation rate of sphalerite can be expressed as: $$ R_{Zn} = 10^{1.1663} [Fe^{3 + } ]_0 ^{0.154} \cdot [H^ + ]^{0.2659} \cdot e^{ - 41.75/RT} or R_{Cd} = 10^{1.7292} [Fe^{3 + } ]_0 ^{0.170} \cdot [H^ + ]^{0.2637} \cdot e^{ - 42.51/RT} $$
Starting Page	457
Ending Page	464
Page Count	8
File Format	PDF
ISSN	10009426
Journal	Chinese Journal of Geochemistry
Volume Number	31
Issue Number	4
e-ISSN	19930364
Language	English
Publisher	SP Science Press
Publisher Date	2012-10-11
Publisher Place	Heidelberg
Access Restriction	Subscribed
Subject Keyword	oxidative kinetics mixed flow reactor hypergene mine environmental pollution Geochemistry
Content Type	Text
Resource Type	Article
Subject	Geochemistry and Petrology

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