Leaching of Indium from Indium-and Iron-Bearing Sphalerite Concentrate in Sulfuric Acid–Ferric Sulfate Solution
-
Huang Hui
,
Wei Chang
Abstract
Leaching of indium from an indium-and iron-bearing sphalerite concentrate in sulfuric acid– ferric sulfate solution was examined. The effects of various parameters were studied. Increases in the stirring speed, temperature, ferric ion and sulfuric acid concentrations, and decreases in the particle size, enhanced the indium leaching rate. Scanning electron microscopy/energy-dispersive X-ray spectroscopy and X-ray diffraction analyses of the unreacted and reacted sphalerite concentrate particles showed that elemental sulfur was formed and precipitated at the particle surfaces. The results show that dissolution was controlled by a mixed-control process. In the initial stage, the dissolution kinetics was chemically controlled. When more elemental sulfur was present on the particle surfaces, the dissolution kinetics was controlled by mass transfer though the sulfur layer. The activation energy of the chemically controlled step was 33.9 kJ/mol. The reaction orders with respect to the initial sulfuric acid and ferric ion concentrations were approximately 0.74 and 0.60, respectively.
Acknowledgements
This work was supported financially by the National Natural Science Foundation of China (Grant Nos. 51564030, 51664030, 51664029, and 51804146), National Key Research Development Program of China (Grant No. 2018YFC1900402), and the Analysis and Testing Center of Kunming University of Science and Technology, China. We thank Helen McPherson, PhD, from Liwen Bianji, Edanz Editing China (www.liwenbianji.cn/ac), for editing the English text of a draft of this manuscript.
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Articles in the same Issue
- Articles
- Numerical Simulation of Flow Characteristics in an Inclining Rotating Kiln with Continuous Feeding
- Minimum Fluidization Velocity of Intermediate Sized Particles in Conventional and Packed Fluidized Bed
- Multicycle Study on Chemical Looping Combustion with a CaSO4-CaO Mixed Oxygen Carrier
- Economic Optimization of Rare Earth Element Leaching Kinetics from Phosphogypsum with Sulfuric Acid
- Heat Transfer Characteristics of Nitrogen in Supercritical Region Using Redlich-Kwong Equation of State
- Chattering Free Sliding Mode Control with Observer Based Adaptive Radial Basis Function Neural Network for Temperature Tracking in a Fixed Bed Reactor
- Role of Support in Hydrocracking of n-hexadecane over Sulfided NiMo Catalysts
- Leaching of Indium from Indium-and Iron-Bearing Sphalerite Concentrate in Sulfuric Acid–Ferric Sulfate Solution
- Electrochemical Behavior of Fe3O4 in NaCl-CaCl2 Melts
- Effect of the Impurity Ions on the Crystallization of Urea Phosphate
