State Key Laboratory Breeding Base Of Complex Non Ferrous Metal Res Clear Utilization In Yunnan Province

Kunming, China

State Key Laboratory Breeding Base Of Complex Non Ferrous Metal Res Clear Utilization In Yunnan Province

Kunming, China
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Luo Q.,Kunming University of Science and Technology | Luo Q.,State Key Laboratory Breeding Base Of Complex Non Ferrous Metal Res Clear Utilization In Yunnan Province | Luo Q.,Key Laboratory of Non Ferrous Metals Vacuum Metallurgy of Yunnan Province | Qu T.,Kunming University of Science and Technology | And 14 more authors.
Zhenkong Kexue yu Jishu Xuebao/Journal of Vacuum Science and Technology | Year: 2012

The impacts of the addition of pure silica powder the on carbothermic reduction of saprolite nickel laterite in vacuum were studied. The pellets were made of powders of pure SiO 2, Fe 2O 3 and coal. The slag was characterized with X-ray diffraction, scanning electron microscopy, energy dispersive spectroscopy and conventional chemical analysis. The results show that the molar ratio of Fe/Si and C content significantly affect the volatilization and reduction rate of silica in the carbothermic reduction at a pressure of 2~200 Pa. Moreover, the Gibbs free energies and critical temperatures of the Fe and Si oxides were calculated, based on thermal dynamics. At 100 Pa, the critical temperature of SiO 2 was found to be 477~584 K lower than that at atmosphere. The experimental results show that as the Fe/Si molar ratio and C content increased, the volatilization rate of Si decreased, whereas its reduction rate increased. SiO 2 was found to change into gaseous SiO, most of which turned into Si and SiO 2 after deposition on graphite condenser. And a small amount of gaseous SiO was observed to react with CO, forming solid phased SiC. Some quartz was observed inside the deposits of the compact Fe-Si alloy and SiC in the slag.


Li L.,National Engineering Laboratory for Vacuum Metallurgy | Li L.,State Key Laboratory Breeding Base Of Complex Non Ferrous Metal Res Clear Utilization In Yunnan Province | Liu D.,National Engineering Laboratory for Vacuum Metallurgy | Liu D.,Key Laboratory of Vacuum Metallurgy for Non Ferrous Metal of Yunnan Province | And 9 more authors.
Zhenkong Kexue yu Jishu Xuebao/Journal of Vacuum Science and Technology | Year: 2012

The feasibility of extracting and enriching Ag and Sb by vacuum distillation of the Pb-Sb multi-component alloys were theoretically analyzed, based on thermodynamics. The impacts of distillation conditions, including the distillation temperature, temperature holding time, and pressure, on the volatilization behavior of the various components were evaluated. The results show that at a pressure of 5~25 Pa, The increase of the distillation temperature and time intensify the volatilization of Ag and Sb. At 1223 K for 30~120 min, The enrichment rate of Ag and volatization rate of Sb were found to be higher than 99.28%, and 89.7%~92.8%, respectively. The X-ray diffraction results of the residue materials show that the formation of the Ag 3Sb, Cu 2Sb and Cu 10Sb phases prevented complete Sb volatilization. Besides, as the temperature holding time increased, the pressure decreased, more rapidly at a higher distillation temperature.


Li L.,National Engineering Laboratory for Vacuum Metallurgy | Li L.,State Key Laboratory Breeding Base Of Complex Non Ferrous Metal Res Clear Utilization In Yunnan Province | Liu D.,National Engineering Laboratory for Vacuum Metallurgy | Liu D.,Key Laboratory of Vacuum Metallurgy for Non Ferrous Metal of Yunnan Province | And 9 more authors.
Zhenkong Kexue yu Jishu Xuebao/Journal of Vacuum Science and Technology | Year: 2012

The evaporation behavior of Sb in distillation of the Ag-contained Pb-Sb multi-component alloys at a pressure about 5~25 Pa, was studied to extract Sb. The impacts of the distillation conditions, including the distillation temperature and time, contents of other metal species, on the evaporation rate of Sb were evaluated: and the dependence of Sb evaporation rate on temperature was estimated. The Sb condensate and residual materials were characterized with X-ray diffraction. The results show that Sb dominates in the Sb condensate. The coexistence of Cu, Ag and Sb in the form of Cu 2Sb and Cu 10Sb 3, and Ag 3Sb in the residue was possibly responsible for incomplete evaporation of Sb. The evaporation rate of Sb was calculated to be 15.169~18.066 g·cm -2·h -1.

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