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- Title
Kinetics of Brass Waste by Hydrogen Reduction for Recovery of Valuable Metals.
- Authors
Choi, Kyungsob; Park, Hyunsik
- Abstract
Gaseous reduction by hydrogen was proposed to decrease carbon dioxide emissions during the recovery of zinc and copper from brass waste. The reduction behavior and kinetics of brass waste were studied at temperatures between 1073 K (800°C) and 1273 K (1000°C) under an Ar-H2 atmosphere. Temporal phase and morphology changes were observed that explained the mechanism of brass waste reduction. Effects of hydrogen partial pressure and temperature on the reduction kinetics were investigated. The reduction rate increased with increase in hydrogen partial pressure and reduction temperature. The reduction kinetics of the brass waste were analyzed using various kinetic model equations for solid-gas reactions. In the first stage, oxygen was released from zinc and copper oxides at the particle boundary of the brass waste, and the reaction was chemically controlled at the interface. Subsequently, metallic zinc was vaporized at random nuclei sites, and the reaction was controlled by the power law. The calculated activation energies were 114.9 kJ/mol and 120.0 kJ/mol, respectively.
- Subjects
WASTE minimization; BRASS; CARBON emissions; COPPER oxide; METALS; PARTIAL pressure
- Publication
JOM: The Journal of The Minerals, Metals & Materials Society (TMS), 2022, Vol 74, Issue 3, p878
- ISSN
1047-4838
- Publication type
Article
- DOI
10.1007/s11837-021-05117-8