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We report the behavior of Mg vapor and CO by dynamic simulation and an experimental study under vacuum. The results of the density functional theory indicated that the interaction of a single CO molecule with the Mg(100) surface was only physical adsorption. During the interaction of two CO molecules with the Mg(100) surface, a strong C-C bond was formed between C1 and C2, and C1-O1 and C2-O2 were...
The combination of flotation and metallurgical processing to treat copper anode slime produces approximately 1400 tons of flotation tailings every year in Yunnan Province. These tailings contain a large amount of valuable metals. In this article, a vacuum distillation three-stage condensation process is proposed to efficiently and selectively separate valuable metals. A laboratory-scale experiment...
Knowledge on the behavior of inclusions in molten steel is crucial to study the fluid flow in the tundish. In this study, an inclusion mass/population conservation model and fluid mass/momentum/energy conservation model were coupled to investigate the spatial distribution of the inclusion volume concentration and inclusion size in the tundish. In this model, collision-coalescence among inclusions...
The present study investigated the effects of adding CH3COOH to HCl and HF used to purify metallurgical-grade Si (MG-Si). After 6 h of leaching MG-Si with an acid mixture consisting of 4 mol L−1 HCl, 3 mol L−1 HF, and 3 mol L−1 CH3COOH at 348 K, the total impurity removal efficiency was 88.5%, exceeding the 81.5% removal efficiency obtained without addition of CH3COOH. The microstructural evolution...
In this paper, Zn-10Bi (wt.%) alloy with Bi droplets in size from micro- to nanometers embedded in the Zn matrix was prepared. Nanocalorimetry was used to investigate the melting and solidification behavior of the embedded Bi droplets. In the heating process, two endothermic peaks were observed attributing to the high sensitivity of the nanocalorimeter. One is close to the eutectic temperature of...
Preparation of Ti powders from TiO2 by calcium vapor reduction was investigated by x-ray diffraction (XRD), scanning electron microscope (SEM), element analysis instrument, inert gas fusion–infrared absorption spectroscopy, and ethylene diamine tetraacetic acid (EDTA) complex formation titration. The experimental results indicate that the reduction reaction occurs very rapidly when the mass ratio...
Aluminum alloys with high stacking fault energies have difficulty forming deformation twins at room temperature and at a low strain rate. In this study, several deformation twins were found in Al-10.0Zn-3.0Mg-1.8Cu alloy powders after being cryomilled for a certain period of time. Annealing twins were also found in the same powders after they had been cryomilled first and then placed at an ambient...
The behavior of silica was investigated experimentally in an alumina carbothermic reduction process and chlorination process in vacuum. The results showed that, first, SiC was produced by SiO2 and C, and then Al4SiC4 was produced by Al4C3, Al4O4C, C, and SiC during the alumina carbothermic reduction process at about 1,763 K. C, Al3C4 and Al4O4C decreased and Al4SiC4 increased as content of SiO2 increased...
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