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Gejiu, China

Sun H.-Y.,Honghe University | Sen W.,Yunnan Tin Company Ltd | Ma W.-H.,National Engineering Laboratory for Vacuum Metallurgy | Yu J.,National Engineering Laboratory for Vacuum Metallurgy | Yang J.-J.,National Engineering Laboratory for Vacuum Metallurgy
Rare Metals

La0.9Sr0.1Ga0.8Mg0.2O3-δ (LSGM) and La0.7Sr0.3Cr0.5Mn0.5O3-δ (LSCM) powders were synthesized by glycine-nitrate process, and LSGM electrolyte thin film was successfully fabricated on porous anode substrate of LSCM by slurry spin coating technology. Some technical parameters for the preparation of LSGM thin films were systematically investigated, including ink composition, sintering temperature, and spin coating times. The electrolyte films with the best compactness and somewhat rough are obtained when the operating parameters are fixed as follows: the content of ethyl cellulose as binder is 5 wt%, the content of terpineol as modifier is 5 wt%, the optimum coating cycle number is 9 times, and the best post-deposition sintering temperature is 1,400 °C for 4 h. © 2014 The Nonferrous Metals Society of China and Springer-Verlag Berlin Heidelberg. Source

Sun H.Y.,Honghe University | Kong X.,Honghe University | Sen W.,Yunnan Tin Company Ltd
Asian Journal of Chemistry

Density functional theory with generalized gradient approximation was used to preliminarily study the reaction mechanism of carbothermal reduction of TiO2 on the material studies by quantum chemical calculations. The results show that in the beginning reaction of carbothermal reduction of TiO2, the solid-solid reaction mainly occurs between TiO2 and carbon. In the initial reaction stage of carbothermal reaction of TiO2, the low-valence titanium oxide TiOx (x < 2) and carbon monoxide gas will be easily produced and the probability of TiCxO1-x is very low. The gas-solid reaction between TiOx (x < 2) and carbon monoxide occurred easily with the reaction proceeding and finally TiC was obtained. Source

Hong-Yan S.,Honghe University | Xin K.,Honghe University | Wei S.,Yunnan Tin Company Ltd | Zhong-Zhou Y.,Honghe University | And 2 more authors.
Materials Science- Poland

Effect of different Sn contents on combustion synthesis of Ti2SnC was studied using elemental Ti, Sn, C and TiC powders as raw materials in the Ti-Sn-C and Ti-Sn-C-TiC system, in which the molar ratio of Ti/C was set as 2:1. The reaction mechanism for the formation of Ti2SnC was also investigated. The results showed that the amount of Ti2SnC in combustion products firstly increased with increasing of Sn content (0.6 to 0.8 mol), and then decreased with further increasing of Sn content (1.0 to 1.2 mol). Upon addition of 15 % TiC instead of Ti and C, the optimum addition of Sn decreased to 0.7 mol and a higher purity of Ti2SnC was obtained. The Ti2SnC powders were characterized by scanning electron microscopy (SEM) and X-ray diffraction (XRD). © Wroclaw University of Technology. Source

Lu H.-B.,Hi. Technology and New Materials Branch of Yunnan Tin Chenzhou Mining and Metallurgy Co. | Lu H.-B.,Yunnan Tin Company Ltd
Zhongguo Youse Jinshu Xuebao/Chinese Journal of Nonferrous Metals

A new technology of sulfidation roasting process for tin anode slime to separate antimony was proposed. Thermodynamic analysis of sulfidation roasting process was conducted. Based on the thermodynamic analysis, the influences of calcination temperature, calcination time, pyrite ratio and coke ratio on the volatilization rate of antimony and the residual rate of tin were investigated. The results show that high temperature benefits for Sb2O4 and SnO2 sulfidation reaction, while Sb2O4 sulfidation trend is stronger than that of SnO2 at the same temperature. While the pyrite content is 30% (mass fraction), coke content is 7% (mass fraction), the calcination temperature is 1323 K, the roasting time is 2 h, the antimony content in calcine is 2.96%, tin content is 31.98%, the volatilization rate of antimony is 85.56%, the residual rate of tin is 88.75%, the effect of separating antimony from tin anode slime by sulfidation roasting is better. © 2015, Central South University of Technology. All right reserved. Source

Sun H.,Honghe University | Kong X.,Honghe University | Sen W.,Yunnan Tin Company Ltd | Wang B.,Honghe University | And 2 more authors.
Zhenkong Kexue yu Jishu Xuebao/Journal of Vacuum Science and Technology

A novel environmental friendly technique was developed to recover Pb and Zn from the wastes of lead smelter, lead and zinc dusts, by carbothermicreduction in vacuum. The impacts of the reduction conditions, including but not limited to the pressure, mole ratio of C/(Zn+Pb), critical reduction temperatures and times of ZnO and PbO, and energy consumption, on the recovery rates of Zn and Pb were theoretically calculated and experimentally investigated. The microstructures and stoichiometry of the lead and zinc dusts and recovered products were characterized with X-ray diffraction, scanning electron microscopy, and conventional chemical analysis tools. The preliminary results show that under compromised conditions: a pressure of 20 Pa, a C/(Zn+Pb)mole ratio of 2.5, a temperature of 1173 K, a reduction time of 60 min, the recovery rates of Zn and Pbreached74.99% and 42.28%, respectively. Besides, a mixture of highly pure zinc and lead was obtained. Source

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