The Experts below are selected from a list of 5859 Experts worldwide ranked by ideXlab platform
Kun Yang - One of the best experts on this subject based on the ideXlab platform.
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Role of manganese dioxide in the recovery of oxide-sulphide Zinc Ore.
Journal of hazardous materials, 2017Co-Authors: Kun Yang, Libo Zhang, Xingcai Zhu, Jinhui Peng, Fei ZhuAbstract:In this article, the role of MnO2 in the recovery of oxide-sulphide Zinc Ore discussed. Through adopting various modern analysis techniques (such as X-ray diffraction pattern, X-ray photoelectron spectroscopy, scanning electron microscope, energy dispersive X-ray analysis, and fourier transform infrared spectroscopy), the function and mechanism of MnO2 during the phase transformation process is found out. Thermodynamic mechanisms involved in the phase transformation process with or without addition of manganese dioxide investigated by exploiting the Equilib module of FactSage. What's mOre, XRD patterns, XPS spectra and SEM-EDAX analyses of Zinc calcines verify well the calculations of FactSage. Results reveal that the addition of MnO2 will produce an aggregation of ZnMn2O4, a valuable energy material, while roasting on its own, results in generating undesirable Zn2SiO4, the oxidation degree being relatively low. MOreover, XRD pattern of Zinc calcine and FT-IR spectrum of yellow product collected in the calcination process prove that the sulphur-fixing value of the additive MnO2, which can promote transforming to the elemental sulphur. The volatile S can be collected through a simple guiding device. In this process, the emission of SO2 effectively avoids, thus MnO2 deems as a potential additive in the recovery of oxide-sulphide Zinc Ore.
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Microwave roasting and leaching of an oxide-sulphide Zinc Ore
Hydrometallurgy, 2016Co-Authors: Kun Yang, Libo Zhang, Jinhui Peng, Chen Weiheng, Xie FengAbstract:Abstract In this paper, a novel combination of phase transformation and leaching is proposed to recover Zinc from an oxide–sulphide Zinc Ore. Accordingly, various analytical technologies, such as X-ray diffraction, chemical analysis, Fourier transform infrared spectroscopy and X-ray photoelectron spectroscopy, are employed. The phase transformation of a raw Ore and the effects of microwave heating and Na 2 O 2 addition on Zinc leaching are investigated. The results show that the addition of a strong oxide Na 2 O 2 can directly transform the refractory phases, particularly Zinc sulphide, into Zinc sulphate. As a result, SO 2 emissions are avoided and an environmentally friendly Zinc recovery process is realised. Both microwave heating and the Na 2 O 2 level have significant effects on phase transformation and Zinc leaching. The Zinc leaching rate can reach 82.06% under the following conditions of microwave heating: adding Na 2 O 2 at a mass ratio of 25%, leaching in an ammonium chloride solution with a total ammonium concentration of 7.5 mol/L and an ammonia/ammonium chloride molar ratio of 1:1, adding NaClO as an aid-leaching reagent and leaching for 1 h. By contrast, the Zinc leaching degree for the Ore samples roasted in a traditional electric resistant furnace is only 30.62%. MOreover, at the same oxidation degree, the total energy consumption by the proposed process is 0.78 kWh/(kg·Ore), which is lower than that by traditional heating (same power). Thus, the combination technology of microwave-heated phase transformation and leaching is effective in treating oxide–sulphide Zinc Ore.
Jinhui Peng - One of the best experts on this subject based on the ideXlab platform.
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Role of manganese dioxide in the recovery of oxide-sulphide Zinc Ore.
Journal of hazardous materials, 2017Co-Authors: Kun Yang, Libo Zhang, Xingcai Zhu, Jinhui Peng, Fei ZhuAbstract:In this article, the role of MnO2 in the recovery of oxide-sulphide Zinc Ore discussed. Through adopting various modern analysis techniques (such as X-ray diffraction pattern, X-ray photoelectron spectroscopy, scanning electron microscope, energy dispersive X-ray analysis, and fourier transform infrared spectroscopy), the function and mechanism of MnO2 during the phase transformation process is found out. Thermodynamic mechanisms involved in the phase transformation process with or without addition of manganese dioxide investigated by exploiting the Equilib module of FactSage. What's mOre, XRD patterns, XPS spectra and SEM-EDAX analyses of Zinc calcines verify well the calculations of FactSage. Results reveal that the addition of MnO2 will produce an aggregation of ZnMn2O4, a valuable energy material, while roasting on its own, results in generating undesirable Zn2SiO4, the oxidation degree being relatively low. MOreover, XRD pattern of Zinc calcine and FT-IR spectrum of yellow product collected in the calcination process prove that the sulphur-fixing value of the additive MnO2, which can promote transforming to the elemental sulphur. The volatile S can be collected through a simple guiding device. In this process, the emission of SO2 effectively avoids, thus MnO2 deems as a potential additive in the recovery of oxide-sulphide Zinc Ore.
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Microwave roasting and leaching of an oxide-sulphide Zinc Ore
Hydrometallurgy, 2016Co-Authors: Kun Yang, Libo Zhang, Jinhui Peng, Chen Weiheng, Xie FengAbstract:Abstract In this paper, a novel combination of phase transformation and leaching is proposed to recover Zinc from an oxide–sulphide Zinc Ore. Accordingly, various analytical technologies, such as X-ray diffraction, chemical analysis, Fourier transform infrared spectroscopy and X-ray photoelectron spectroscopy, are employed. The phase transformation of a raw Ore and the effects of microwave heating and Na 2 O 2 addition on Zinc leaching are investigated. The results show that the addition of a strong oxide Na 2 O 2 can directly transform the refractory phases, particularly Zinc sulphide, into Zinc sulphate. As a result, SO 2 emissions are avoided and an environmentally friendly Zinc recovery process is realised. Both microwave heating and the Na 2 O 2 level have significant effects on phase transformation and Zinc leaching. The Zinc leaching rate can reach 82.06% under the following conditions of microwave heating: adding Na 2 O 2 at a mass ratio of 25%, leaching in an ammonium chloride solution with a total ammonium concentration of 7.5 mol/L and an ammonia/ammonium chloride molar ratio of 1:1, adding NaClO as an aid-leaching reagent and leaching for 1 h. By contrast, the Zinc leaching degree for the Ore samples roasted in a traditional electric resistant furnace is only 30.62%. MOreover, at the same oxidation degree, the total energy consumption by the proposed process is 0.78 kWh/(kg·Ore), which is lower than that by traditional heating (same power). Thus, the combination technology of microwave-heated phase transformation and leaching is effective in treating oxide–sulphide Zinc Ore.
Libo Zhang - One of the best experts on this subject based on the ideXlab platform.
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Role of manganese dioxide in the recovery of oxide-sulphide Zinc Ore.
Journal of hazardous materials, 2017Co-Authors: Kun Yang, Libo Zhang, Xingcai Zhu, Jinhui Peng, Fei ZhuAbstract:In this article, the role of MnO2 in the recovery of oxide-sulphide Zinc Ore discussed. Through adopting various modern analysis techniques (such as X-ray diffraction pattern, X-ray photoelectron spectroscopy, scanning electron microscope, energy dispersive X-ray analysis, and fourier transform infrared spectroscopy), the function and mechanism of MnO2 during the phase transformation process is found out. Thermodynamic mechanisms involved in the phase transformation process with or without addition of manganese dioxide investigated by exploiting the Equilib module of FactSage. What's mOre, XRD patterns, XPS spectra and SEM-EDAX analyses of Zinc calcines verify well the calculations of FactSage. Results reveal that the addition of MnO2 will produce an aggregation of ZnMn2O4, a valuable energy material, while roasting on its own, results in generating undesirable Zn2SiO4, the oxidation degree being relatively low. MOreover, XRD pattern of Zinc calcine and FT-IR spectrum of yellow product collected in the calcination process prove that the sulphur-fixing value of the additive MnO2, which can promote transforming to the elemental sulphur. The volatile S can be collected through a simple guiding device. In this process, the emission of SO2 effectively avoids, thus MnO2 deems as a potential additive in the recovery of oxide-sulphide Zinc Ore.
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Microwave roasting and leaching of an oxide-sulphide Zinc Ore
Hydrometallurgy, 2016Co-Authors: Kun Yang, Libo Zhang, Jinhui Peng, Chen Weiheng, Xie FengAbstract:Abstract In this paper, a novel combination of phase transformation and leaching is proposed to recover Zinc from an oxide–sulphide Zinc Ore. Accordingly, various analytical technologies, such as X-ray diffraction, chemical analysis, Fourier transform infrared spectroscopy and X-ray photoelectron spectroscopy, are employed. The phase transformation of a raw Ore and the effects of microwave heating and Na 2 O 2 addition on Zinc leaching are investigated. The results show that the addition of a strong oxide Na 2 O 2 can directly transform the refractory phases, particularly Zinc sulphide, into Zinc sulphate. As a result, SO 2 emissions are avoided and an environmentally friendly Zinc recovery process is realised. Both microwave heating and the Na 2 O 2 level have significant effects on phase transformation and Zinc leaching. The Zinc leaching rate can reach 82.06% under the following conditions of microwave heating: adding Na 2 O 2 at a mass ratio of 25%, leaching in an ammonium chloride solution with a total ammonium concentration of 7.5 mol/L and an ammonia/ammonium chloride molar ratio of 1:1, adding NaClO as an aid-leaching reagent and leaching for 1 h. By contrast, the Zinc leaching degree for the Ore samples roasted in a traditional electric resistant furnace is only 30.62%. MOreover, at the same oxidation degree, the total energy consumption by the proposed process is 0.78 kWh/(kg·Ore), which is lower than that by traditional heating (same power). Thus, the combination technology of microwave-heated phase transformation and leaching is effective in treating oxide–sulphide Zinc Ore.
Xie Feng - One of the best experts on this subject based on the ideXlab platform.
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Microwave roasting and leaching of an oxide-sulphide Zinc Ore
Hydrometallurgy, 2016Co-Authors: Kun Yang, Libo Zhang, Jinhui Peng, Chen Weiheng, Xie FengAbstract:Abstract In this paper, a novel combination of phase transformation and leaching is proposed to recover Zinc from an oxide–sulphide Zinc Ore. Accordingly, various analytical technologies, such as X-ray diffraction, chemical analysis, Fourier transform infrared spectroscopy and X-ray photoelectron spectroscopy, are employed. The phase transformation of a raw Ore and the effects of microwave heating and Na 2 O 2 addition on Zinc leaching are investigated. The results show that the addition of a strong oxide Na 2 O 2 can directly transform the refractory phases, particularly Zinc sulphide, into Zinc sulphate. As a result, SO 2 emissions are avoided and an environmentally friendly Zinc recovery process is realised. Both microwave heating and the Na 2 O 2 level have significant effects on phase transformation and Zinc leaching. The Zinc leaching rate can reach 82.06% under the following conditions of microwave heating: adding Na 2 O 2 at a mass ratio of 25%, leaching in an ammonium chloride solution with a total ammonium concentration of 7.5 mol/L and an ammonia/ammonium chloride molar ratio of 1:1, adding NaClO as an aid-leaching reagent and leaching for 1 h. By contrast, the Zinc leaching degree for the Ore samples roasted in a traditional electric resistant furnace is only 30.62%. MOreover, at the same oxidation degree, the total energy consumption by the proposed process is 0.78 kWh/(kg·Ore), which is lower than that by traditional heating (same power). Thus, the combination technology of microwave-heated phase transformation and leaching is effective in treating oxide–sulphide Zinc Ore.
Fei Zhu - One of the best experts on this subject based on the ideXlab platform.
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Role of manganese dioxide in the recovery of oxide-sulphide Zinc Ore.
Journal of hazardous materials, 2017Co-Authors: Kun Yang, Libo Zhang, Xingcai Zhu, Jinhui Peng, Fei ZhuAbstract:In this article, the role of MnO2 in the recovery of oxide-sulphide Zinc Ore discussed. Through adopting various modern analysis techniques (such as X-ray diffraction pattern, X-ray photoelectron spectroscopy, scanning electron microscope, energy dispersive X-ray analysis, and fourier transform infrared spectroscopy), the function and mechanism of MnO2 during the phase transformation process is found out. Thermodynamic mechanisms involved in the phase transformation process with or without addition of manganese dioxide investigated by exploiting the Equilib module of FactSage. What's mOre, XRD patterns, XPS spectra and SEM-EDAX analyses of Zinc calcines verify well the calculations of FactSage. Results reveal that the addition of MnO2 will produce an aggregation of ZnMn2O4, a valuable energy material, while roasting on its own, results in generating undesirable Zn2SiO4, the oxidation degree being relatively low. MOreover, XRD pattern of Zinc calcine and FT-IR spectrum of yellow product collected in the calcination process prove that the sulphur-fixing value of the additive MnO2, which can promote transforming to the elemental sulphur. The volatile S can be collected through a simple guiding device. In this process, the emission of SO2 effectively avoids, thus MnO2 deems as a potential additive in the recovery of oxide-sulphide Zinc Ore.
