Electrometallurgy 2020: Poster Session
Sponsored by: TMS Extraction and Processing Division, TMS: Hydrometallurgy and Electrometallurgy Committee, TMS: Process Technology and Modeling Committee, TMS: Pyrometallurgy Committee
Program Organizers: Antoine Allanore, Massachusetts Institute of Technology; Michael Free, University of Utah; Georges Houlachi, Hydro-Quebec; Hojong Kim, Pennsylvania State University; Takanari Ouchi, University of Tokyo; Shijie Wang, Coeur Mining, Inc
Tuesday 5:30 PM
February 25, 2020
Room: Sails Pavilion
Location: San Diego Convention Ctr
M-56 (Digital): Electron Beam Refinery and Purification in Newly Constructed Production Units with Gas Discharged Electron Beam Guns: Alexander Manulyk1; Nikolayi Grechanyuk1; Pavel Kucherenko1; Alexey Melnik1; 1Synergy Antech Services INC
Newly constructed electron beam unit with gas discharged e-guns is capable of getting any pure metals and alloys up to 99.99 % of weight in forms of ingots, billets, production of powders is also possible. The critical point of equipment is a new very powerful electron beam gun from 30 kW to 600 kW. Electron-beam re-melting has the purpose of purifying metals in a vacuum and getting in copper water cooling crucible with intermediate pool by the horizontal supply of waste materials like ingots, pieces of rods and various wastes. High pure ingots of Mo, Nb, Hf, Zr, Ni, Cu, Co, Fe, heat resisting and heat-resistant alloys on the mentioned above metals and also Ti3Al, TiAl, Ni3Al, NiAl are made. We are making electron beam re-melting of customer metals, alloys with given chemical compositions.
Cancelled
M-57: Effects of Precursor Concentration on the Surface Morphology and Electrocatalytic Performance of Ti/IrO2-RuO2-SiO2 Anode for Oxygen Evolution Reaction: Bao Liu1; Shuo Wang1; Qiankun Jing1; Chengyan Wang1; 1University of Science and Technology Beijing
Oxygen evolution reaction (OER) as a counter reaction plays a key role for metal electrowinning. The development of an efficient, long-lived and low-cost anode for OER is of increasingly significance for metal electrowinning. IrO2-RuO2-SiO2 ternary oxide film coated on titanium substrate was prepared using sol-gel route, followed by thermal decomposition method. The effects of precursor concentration on the surface morphology and electrocatalytic properties of Ti/IrO2-RuO2-SiO2 anode were investigated by physical characterization and electrochemical measurements. It was found that the crystallinity of the oxide coating decreased with increasing precursor concentration. Increasing precursor concentration increased the amount of cracks of the oxide coating. The electrocatalytic activity of the prepared anode improved, while the electrocatalytic stability decreased with the increase in precursor concentration. Considering the electrocatalytic activity and stability, precursor concentration of 0.2-0.3 mol/L is most suitable for the preparation of the Ti/IrO2-RuO2-SiO2 anode.
M-58: Electrochemical Behavior of Fe2O3 in Electro-deoxygenation in NaCl-CaCl2 Molten Salt System: Lei Jia1; Hui Li1; Zongying Cai1; Jinglong Liang1; 1North China University of Science and Technology
In the molten NaCl-CaCl2 co-crystal, the composition and morphology of the product were obtained by using a solid agglomerate of Fe2O3 particles as a raw material and a graphite rod as an anode at 800 °C under cyclic temperature voltammetry and combined with constant potential electrolysis at different times. XRD and SEM analysis showed that the reduction mechanism of solid Fe2O3 includes (1) chemical formation of dicalcium ferrite (Ca2Fe2O5); (2) electrocalcification of ferric acid to metal iron Ca2Fe2O5→Fe3O4→FeO→Fe, and finally Electrolysis was carried out for 5 h at a voltage of 2.5 V to prepare a metal iron having an oxygen content of 1.29%, and the electrolysis efficiency was 97.6%. The electrolysis product iron appears as interconnected micron-sized network particles. These studies provide theoretical support for the direct electroreduction of Fe2O3 particles to prepare metallic iron.
M-59: Reduction Mechanism of Metal Cobalt from Cathode Material of Waste Lithium Cobalt Oxide Battery: Jing Wang1; Jinglong Liang1; Hui Li1; Jie Xu1; 1North China University of Science And Technology
The electrical properties of Co(III) in LiCoO2 on Pt working electrode in 1023K NaCl-CaCl2(1:1) molten salt were studied by cyclic voltammetry, square wave voltammetry, linear sweep and chronoamperometry. The reduction of Co(III) in LiCoO2 to cobalt is a two-step reduction process, Co(III)→Co(II)→Co. The first and second steps are quasi-reversible processes controlled by diffusion control and kinetics. LiCoO2 was subjected to potentiostatic electrolysis for 10 h at a voltage of 1.5 V, and cobalt was directly prepared in 1023 K molten NaCl-CaCl2. The results showed that pure cobalt was obtained.
Cancelled
M-60: Review on the Bio-oxidation of Pyrite: Implications for Mining Industry: Xin Lv1; 1Central South University
Pyrite (FeS2) is the most abundant and widely spread iron containing sulfide minerals, it is also an important source of sulfuric acid (H2SO4) and is commonly associated with the other valuable minerals as gangue mineral. Hence, it cannot be ignored in the modern industry, especially in the mining industry. Bio-oxidation of pyrite is an important technology, which mainly means the surface oxidation and/or the oxidative dissolution of pyrite in the presence of microorganisms. Pyrite biooxidation is extremely important in the mining industry, such as biooxidation of refractory gold ores, bioleaching of precious metals, biological desulphurization and acid mine drainage (AMD). In this paper, the crystal structure and physicochemical properties of pyrite have been summarized. The biooxidation mechanisms of pyrite in various systems were summed up, compared and discussed according to previous publications. Finally, the current status, challenges and future prospects of biooxidation technologies of pyrite in different systems were discussed.