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Zhuzhou, China

Mu W.,Northeastern University China | Zhang H.,Zhuzhou Smelter Group Co. | Su Z.,Yunnan Chihong Zn & Ge Co. | Song P.,Zhuzhou Smelter Group Co.
Xiyou Jinshu/Chinese Journal of Rare Metals | Year: 2015

Molybdenum is an important strategic metal. Currently, molybdenum ore resources in China are becoming shortage increasingly as the continuous exploitation of mines and the increasing demand for molybdenum. Therefore, low-grade molybdenum will become the key object of exploitation, and the economic development and reasonable utilization of it will become the focus of research. According to the characteristics and the properties of low-grade molybdenum ore, such as low grade and high gangue content, the process of low-temperature roasting by sodium carbonate was used, and the molybdate generated during roasting could dissolve into water by leaching method, realizing the separation from gangue minerals. The results of thermodynamic analysis showed that when the temperature was in the range of 523~873 K, the Gibbs free energy of molybdate formation was less than 0, and the formation trend detracted with the temperature increasing gradually. In addition, the reaction activity of silica and alumina was very low. The effects and regulation of powder particle size, roasting temperature, roasting time and the mass ratio of alkali to ore on the conversion of molybdenum and the control of impurity silicon introduction were investigated. Through X-ray diffraction (XRD) analysis of ore samples, clinker and leaching residue, the transformation process of molybdenum were studied. The results showed that under the roasting conditions of ore particle size of 80~96 μm, roasting temperature of 550℃, roasting time of 3 h and the alkali/ore mass ratio of 2, the conversion rates of molybdenum and silicon reached 93.9% and less than 1.3%, respectively. It would provide theoretical guidance and technical reference for the development and the utilization of low-grade molybdenum ore. ©, 2015, Editorial Office of Chinese Journal of Rare Metals. All right reserved. Source


Zhou P.,Central South University | Li H.-L.,Central South University | Wei W.-W.,Zhuzhou Smelter Group Co. | Su Y.-B.,Central South University
Dongbei Daxue Xuebao/Journal of Northeastern University | Year: 2015

The gas-liquid two-phase flows in zinc electrolytic cells with single plate and multiple plates were respectively numerically simulated with the commercial software of FLUENT. Based on the mechanism of the generation and movement of oxygen bubbles, the rising velocity of a single bubble was calculated. The results indicate that the rising velocity is 0.017 m/s. With the effect of bubbles from the anode, the electrolyte near the anode flows upward and oppositely flows downward near the cathodes, forming a large recirculation zone in the cell. The average velocity of bubble cluster is 0.021 m/s, which is consistent with the experimental data from the literature. In practical operation, with the joint action of the differential pressure and the bubble drag force, the recirculation of electrolyte flow can be enhanced remarkably. The average velocity of interelectrode fluid is 1.5 times higher than that under the bubble-free condition. This phenomenon indicates that the bubble movement can promote the refreshing of zinc electrolyte and restrain the dilution of zinc ions. ©, 2015, Northeastern University. All right reserved. Source


Trademark
Zhuzhou Smelter Group Co. | Date: 2009-05-12

Electrolytic copper, namely, ingots, ores, alloy ingots of copper that have been refined by electrolytic deposition; electrolytic lead, namely, ingots, ores, alloy ingots of lead that have been refined by electrolytic deposition; zinc ores; zinc ingots; zinc alloy ingots; common metals in the nature of indium ores, indium ingots, indium alloy ingots; common metals in the nature of cadmium ores, cadmium ingots, cadmium alloy ingots; zinc ores, ingots, alloy ingots in the form of dust; common metals, unwrought or semi-wrought, for further manufacture; alloys of common metal; ingots of common metal.


Trademark
Zhuzhou Smelter Group Co. | Date: 2009-05-12

Electrolytic copper, namely, ingots, ores, alloy ingots of copper that have been refined by electrolytic deposition; electrolytic lead, namely, ingots, ores, alloy ingots of lead that have been refined by electrolytic deposition; zinc ores; zinc ingots; zinc alloy ingots; common metals in the nature of indium ores, indium ingots, indium alloy ingots; common metals in the nature of cadmium ores, cadmium ingots, cadmium alloy ingots; zinc ores, ingots, alloy ingots in the form of dust; common metals, unwrought or semi-wrought, for further manufacture; alloys of common metal; ingots of common metal.


Li H.,Central South University | Yao X.,Central South University | Wang M.,Huazhong Agricultural University | Wu S.,Central South University | And 3 more authors.
Journal of the Air and Waste Management Association | Year: 2014

Recovery of elemental sulfur from zinc concentrate direct leaching residue (DLR) using atmospheric distillation was systematically investigated on a pilot-scale system for the first time. Batch operating mode was suggested for recovery of elemental sulfur from water-rich DLR using atmospheric distillation. Elemental sulfur with purity higher than 99% was obtained under certain conditions in batch operating mode. With an appropriate feed amount of 1,200 kg, batch experiment conducted at 460°C resulted in sulfur purity of 96.22% and a recovery rate higher than 85%. Only 0.59 and 1.24 kWh power was needed to handle 1.0 kg DLR and produce 1.0 kg elemental sulfur, respectively. The results suggest that recovery of elemental sulfur from zinc concentrate DLR using atmospheric distillation is technologically and economically feasible. Moreover, other metal elements such as zinc were enriched in the distillation concentrate, which could be used for metal refining. Technologies could effectively lower the moisture content of DLR, and lowering the distillation temperature would be of great value for recovery of elemental sulfur from DLR using a distillation method. Distillation is a promising solution for recovery of elemental sulfur from DLRs. This work revealed the possibility of separation of elemental sulfur from zinc concentrate DLR using atmospheric distillation. Such knowledge is of fundamental importance in developing field-scale separation and purification technologies and devices in which simultaneous sulfur recovery and precious metal enrichment are possible. Important tasks for follow-up research are also suggested. © 2014 Copyright 2014 A&WMA. Source

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