Experimental Study on Pressure Leaching of Zinc Sulfide …
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of dissolved iron proceed simultaneously. The precipitation form of iron can be
regulated.
Tian [12] from Northeastern University systematically studied the basic process
of oxygen enriched pressure leaching of sphalerite from the perspectives of mechanical activation, different catalytic leaching systems, and oxygen bubble behavior.
The study pointed out that mechanical activation caused the variation of crystallite
size and the distortion of lattice, resulting in reduced sphalerite particle size and
increased specific surface area of the sphalerite. All of these lead to the enhanced
reaction kinetics, leading to an increase in the oxidation rate of the sphalerite and a
reduction of the acid leaching reaction order. During the reaction, the variations of
sulfur conversion rate and the indium leaching rate with the change of the reaction
conditions are consistent, both of which are kinetically controlled by the interface
chemical reaction. In addition, it was also pointed out that the leaching process is
effectively promoted by the self-precipitation redox mechanism of Fe. In their study,
the variation of bubble refinement and gas holdup during the reaction was explored,
and the phenomenological equations of gas holdup and diameter were obtained.
Conclusion
The majority of the metal minerals in this ore sample are sphalerite, along with a small
amount of galena, chalcopyrite, and pyrite. Non-metallic minerals are mainly quartz,
along with dolomite, a small amount of chlorite and muscovite. The iron content in
the ore sample is 2.44%. The iron is mainly present in the form of isomorphism. The
distribution rate of iron in sphalerite is 45.72%. Secondly, the iron exists in the form of
pyrite and chalcopyrite with the distribution rate of 27.68% and 23.16%, respectively.
1.95% of iron exists in the form of silicates such as chlorite and muscovite. In addition,
1.49% of iron is present in the dolomite in the form of carbonate.
Temperature and acidity have a large effect on the leaching rate of zinc and iron.
The zinc leaching rate increases with temperature and acidity. The change trend of
iron leaching rate with temperature and acidity is different. The iron leaching rate
increases to the highest value of 67.5% with the temperature of 150 °C, and then
decreases to the lowest value of 18.9%. The iron leaching rate increases with the
acid-zinc ratio. The rate of increase is slightly different for certain range of acid-zinc
ration.
Acknowledgements This work was financially supported by the National Natural Science Foundation of China (Key Project No. 51434001) and National Key Research and Development Plan of
China (2018YFC1900401).
863
of dissolved iron proceed simultaneously. The precipitation form of iron can be
regulated.
Tian [12] from Northeastern University systematically studied the basic process
of oxygen enriched pressure leaching of sphalerite from the perspectives of mechanical activation, different catalytic leaching systems, and oxygen bubble behavior.
The study pointed out that mechanical activation caused the variation of crystallite
size and the distortion of lattice, resulting in reduced sphalerite particle size and
increased specific surface area of the sphalerite. All of these lead to the enhanced
reaction kinetics, leading to an increase in the oxidation rate of the sphalerite and a
reduction of the acid leaching reaction order. During the reaction, the variations of
sulfur conversion rate and the indium leaching rate with the change of the reaction
conditions are consistent, both of which are kinetically controlled by the interface
chemical reaction. In addition, it was also pointed out that the leaching process is
effectively promoted by the self-precipitation redox mechanism of Fe. In their study,
the variation of bubble refinement and gas holdup during the reaction was explored,
and the phenomenological equations of gas holdup and diameter were obtained.
Conclusion
The majority of the metal minerals in this ore sample are sphalerite, along with a small
amount of galena, chalcopyrite, and pyrite. Non-metallic minerals are mainly quartz,
along with dolomite, a small amount of chlorite and muscovite. The iron content in
the ore sample is 2.44%. The iron is mainly present in the form of isomorphism. The
distribution rate of iron in sphalerite is 45.72%. Secondly, the iron exists in the form of
pyrite and chalcopyrite with the distribution rate of 27.68% and 23.16%, respectively.
1.95% of iron exists in the form of silicates such as chlorite and muscovite. In addition,
1.49% of iron is present in the dolomite in the form of carbonate.
Temperature and acidity have a large effect on the leaching rate of zinc and iron.
The zinc leaching rate increases with temperature and acidity. The change trend of
iron leaching rate with temperature and acidity is different. The iron leaching rate
increases to the highest value of 67.5% with the temperature of 150 °C, and then
decreases to the lowest value of 18.9%. The iron leaching rate increases with the
acid-zinc ratio. The rate of increase is slightly different for certain range of acid-zinc
ration.
Acknowledgements This work was financially supported by the National Natural Science Foundation of China (Key Project No. 51434001) and National Key Research and Development Plan of
China (2018YFC1900401).