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Kang Jinxing - One of the best experts on this subject based on the ideXlab platform.

  • The separation of Gold and vanadium in carbonaceous Gold Ore by one-step roasting method
    'Elsevier BV', 2019
    Co-Authors: Wang Hongjun, Feng Yali, Li Haoran, Kang Jinxing
    Abstract:

    The separation of Gold and vanadium in the refractory carbonaceous Gold Ore had been performed by one-step roasting method. The thermodynamic viability of the possible reactions in the process was analyzed based on thermodynamic data. And the effects of experimental parameters such as roasting temperature, roasting time and NaCl dosage on the recovery ratios of Gold and vanadium were investigated. Under the optimal conditions of NaCl 10%, roasting temperature 800 degrees C, roasting time 4 h and air gas flow rate 1 L/min, the recovery ratios of Gold and vanadium were 92% and 85.34%, respectively, realizing the effective separation of Gold and vanadium. In addition, the reaction mechanism and phase transformation during the roasting process were revealed using SEM, EDS and XRD. Results demonstrated that it was beneficial to the chlorination reaction of Gold in the presence of pyrite. In the low-temperature roasting, the chlorination reaction of Gold was dominant in the roasting process. And in the high-temperature roasting, the chlorination reaction of Gold and the sodium reaction of vanadium were dominant in the roasting process. (C) 2019 Published by Elsevier B.V

  • The separation of Gold and vanadium in carbonaceous Gold Ore by one-step roasting method
    Powder Technology, 2019
    Co-Authors: Hongjun Wang, Ya-li Feng, Kang Jinxing
    Abstract:

    Abstract The separation of Gold and vanadium in the refractory carbonaceous Gold Ore had been performed by one-step roasting method. The thermodynamic viability of the possible reactions in the process was analyzed based on thermodynamic data. And the effects of experimental parameters such as roasting temperature, roasting time and NaCl dosage on the recovery ratios of Gold and vanadium were investigated. Under the optimal conditions of NaCl 10%, roasting temperature 800 °C, roasting time 4 h and air gas flow rate 1 L/min, the recovery ratios of Gold and vanadium were 92% and 85.34%, respectively, realizing the effective separation of Gold and vanadium. In addition, the reaction mechanism and phase transformation during the roasting process were revealed using SEM, EDS and XRD. Results demonstrated that it was beneficial to the chlorination reaction of Gold in the presence of pyrite. In the low-temperature roasting, the chlorination reaction of Gold was dominant in the roasting process. And in the high-temperature roasting, the chlorination reaction of Gold and the sodium reaction of vanadium were dominant in the roasting process.

Antonio F. F. Santos - One of the best experts on this subject based on the ideXlab platform.

  • Temporal evolution of the giant Salobo IOCG deposit, Carajás Province (Brazil): constraints from paragenesis of hydrothermal alteration and U-Pb geochronology
    Mineralium Deposita, 2017
    Co-Authors: Gustavo H. C. Demelo, Lena V. S. Monteiro, Roberto P Xavier, Carolina P. N. Moreto, Erika S. B. Santiago, S. Andrew Dufrane, Benevides Aires, Antonio F. F. Santos
    Abstract:

    The giant Salobo copper-Gold deposit is located in the Carajás Province, Amazon Craton. Detailed drill cOre description, petrographical studies, and U-Pb SHRIMP IIe and LA-ICP-MS geochronology unravel its evolution regarding the host rocks, hydrothermal alteration and mineralization. Within the Cinzento Shear Zone, the deposit is hosted by orthogneisses of the Mesoarchean Xingu Complex (2950 ± 25 and 2857 ± 6.7 Ma) and of the Neoarchean Igarapé Gelado suite (2763 ± 4.4 Ma), which are crosscut by the Old Salobo granite. Remnants of the Igarapé Salobo metavolcanic-sedimentary sequence are represented by a quartz mylonite with detrital zircon populations (ca. 3.1–3.0, 2.95, 2.86, and 2.74 Ga). High-temperature calcic-sodic hydrothermal alteration (hastingsite-actinolite) was followed by silicification, iron-enrichment (almandine-grunerite-magnetite), tourmaline formation, potassic alteration with biotite, copper-Gold Ore formation, and later Fe-rich hydrated silicate alteration. Myrmekitic bornite-chalcocite and magnetite comprise the bulk of copper-Gold Ore. All these alteration assemblages have been overprinted by post-Ore hematite-bearing potassic and propylitic alteration, which is also recognized in the Old Salobo granite. In the central zone of the deposit the mylonitized Igarapé Gelado suite rocks yield an age of 2701 ± 30 Ma. Zircon ages of 2547 ± 5.3 and 2535 ± 8.4 Ma were obtained for the Old Salobo granite and for the high-grade copper Ore, respectively. A U-Pb LA-ICP-MS monazite age (2452 ± 14 Ma) from the copper-Gold Ore indicates hydrothermal activity and overprinting in the Siderian. TherefOre, a protracted tectono-thermal event due to the reactivation of the Cinzento Shear Zone is proposed for the evolution of the Salobo deposit.

  • temporal evolution of the giant salobo iocg deposit carajas province brazil constraints from paragenesis of hydrothermal alteration and u pb geochronology
    Mineralium Deposita, 2017
    Co-Authors: Gustavo H. C. Demelo, Lena V. S. Monteiro, Roberto P Xavier, Carolina P. N. Moreto, Erika S. B. Santiago, Benevides Aires, Andrew S Dufrane, Antonio F. F. Santos
    Abstract:

    The giant Salobo copper-Gold deposit is located in the Carajas Province, Amazon Craton. Detailed drill cOre description, petrographical studies, and U-Pb SHRIMP IIe and LA-ICP-MS geochronology unravel its evolution regarding the host rocks, hydrothermal alteration and mineralization. Within the Cinzento Shear Zone, the deposit is hosted by orthogneisses of the Mesoarchean Xingu Complex (2950 ± 25 and 2857 ± 6.7 Ma) and of the Neoarchean Igarape Gelado suite (2763 ± 4.4 Ma), which are crosscut by the Old Salobo granite. Remnants of the Igarape Salobo metavolcanic-sedimentary sequence are represented by a quartz mylonite with detrital zircon populations (ca. 3.1–3.0, 2.95, 2.86, and 2.74 Ga). High-temperature calcic-sodic hydrothermal alteration (hastingsite-actinolite) was followed by silicification, iron-enrichment (almandine-grunerite-magnetite), tourmaline formation, potassic alteration with biotite, copper-Gold Ore formation, and later Fe-rich hydrated silicate alteration. Myrmekitic bornite-chalcocite and magnetite comprise the bulk of copper-Gold Ore. All these alteration assemblages have been overprinted by post-Ore hematite-bearing potassic and propylitic alteration, which is also recognized in the Old Salobo granite. In the central zone of the deposit the mylonitized Igarape Gelado suite rocks yield an age of 2701 ± 30 Ma. Zircon ages of 2547 ± 5.3 and 2535 ± 8.4 Ma were obtained for the Old Salobo granite and for the high-grade copper Ore, respectively. A U-Pb LA-ICP-MS monazite age (2452 ± 14 Ma) from the copper-Gold Ore indicates hydrothermal activity and overprinting in the Siderian. TherefOre, a protracted tectono-thermal event due to the reactivation of the Cinzento Shear Zone is proposed for the evolution of the Salobo deposit.

Hongjun Wang - One of the best experts on this subject based on the ideXlab platform.

  • simultaneous extraction of Gold and zinc from refractory carbonaceous Gold Ore by chlorination roasting process
    Transactions of Nonferrous Metals Society of China, 2020
    Co-Authors: Hongjun Wang, Ya-li Feng, Li Haoran, Jinxing Kang
    Abstract:

    Abstract A novel process based on chlorination roasting was proposed to simultaneously recover Gold and zinc from refractory carbonaceous Gold Ore by using NaCl as chlorination agent. The effects of roasting temperature, roasting time and NaCl content on the volatilization rates of Gold and zinc were investigated. The reaction mechanism and the phase transition process were also analyzed by means of SEM, EDS and XRD. The results demonstrated that under the optimal conditions of NaCl content of 10%, roasting temperature of 800 °C, roasting time of 4 h and gas flow rate of 1 L/min, the rates of Gold and zinc were 92% and 92.56%, respectively. During low-temperature chlorination roasting stage, a certain content of sulfur was beneficial to the chlorination reactions of Gold and zinc; and during high-temperature chlorination roasting stage, the crystal structure of vanadium-bearing mica was destroyed, and the vanadium-containing oxides were beneficial to the chlorinating volatilization of Gold and zinc. Eventually, the chlorinated volatiles of Gold and zinc could be recovered by alkaline solution.

  • The separation of Gold and vanadium in carbonaceous Gold Ore by one-step roasting method
    Powder Technology, 2019
    Co-Authors: Hongjun Wang, Ya-li Feng, Kang Jinxing
    Abstract:

    Abstract The separation of Gold and vanadium in the refractory carbonaceous Gold Ore had been performed by one-step roasting method. The thermodynamic viability of the possible reactions in the process was analyzed based on thermodynamic data. And the effects of experimental parameters such as roasting temperature, roasting time and NaCl dosage on the recovery ratios of Gold and vanadium were investigated. Under the optimal conditions of NaCl 10%, roasting temperature 800 °C, roasting time 4 h and air gas flow rate 1 L/min, the recovery ratios of Gold and vanadium were 92% and 85.34%, respectively, realizing the effective separation of Gold and vanadium. In addition, the reaction mechanism and phase transformation during the roasting process were revealed using SEM, EDS and XRD. Results demonstrated that it was beneficial to the chlorination reaction of Gold in the presence of pyrite. In the low-temperature roasting, the chlorination reaction of Gold was dominant in the roasting process. And in the high-temperature roasting, the chlorination reaction of Gold and the sodium reaction of vanadium were dominant in the roasting process.

Anna H. Kaksonen - One of the best experts on this subject based on the ideXlab platform.

  • Bioleaching of Gold from Sulfidic Gold Ore Concentrate and Electronic Waste by Roseovarius tolerans and Roseovarius mucosus.
    Microorganisms, 2020
    Co-Authors: Kanjana Kudpeng, Tsing Bohu, Christina Morris, Paitip Thiravetyan, Anna H. Kaksonen
    Abstract:

    Gold bioleaching mediated by iodide oxidizing bacteria (IOB) has been proposed as a sustainable alternative to conventional technologies such as cyanidation. This study evaluated the ability of two IOB sourced from a commercial culture collection, Roseovarius (R.) tolerans DSM 11457T and R. mucosus DSM 17069T, to bioleach Gold from electronic waste (e-waste) (1030 ppm Gold) and sulfidic Gold Ore concentrate (45 ppm Gold) using one-step, two-step and spent medium leaching at 1% pulp density over 10 days. Two-step bioleaching of Ore concentrate resulted in the highest Gold leaching yields (approximately ~100% and 34% for R. tolerans and R. mucosus, respectively), followed by spent medium leaching and one-step leaching. The yields remained low for e-waste with both strains (maximum 0.93% and 1.6% for R. tolerans and R. mucosus, respectively) and decreased over time, likely due to the instability of the solubilized Gold at relatively low redox potentials (

  • bioleaching of Gold from sulfidic Gold Ore concentrate and electronic waste by roseovarius tolerans and roseovarius mucosus
    Microorganisms, 2020
    Co-Authors: Kanjana Kudpeng, Tsing Bohu, Christina Morris, Paitip Thiravetyan, Anna H. Kaksonen
    Abstract:

    Gold bioleaching mediated by iodide oxidizing bacteria (IOB) has been proposed as a sustainable alternative to conventional technologies such as cyanidation. This study evaluated the ability of two IOB sourced from a commercial culture collection, Roseovarius (R.) tolerans DSM 11457T and R. mucosus DSM 17069T, to bioleach Gold from electronic waste (e-waste) (1030 ppm Gold) and sulfidic Gold Ore concentrate (45 ppm Gold) using one-step, two-step and spent medium leaching at 1% pulp density over 10 days. Two-step bioleaching of Ore concentrate resulted in the highest Gold leaching yields (approximately ~100% and 34% for R. tolerans and R. mucosus, respectively), followed by spent medium leaching and one-step leaching. The yields remained low for e-waste with both strains (maximum 0.93% and 1.6% for R. tolerans and R. mucosus, respectively) and decreased over time, likely due to the instability of the solubilized Gold at relatively low redox potentials (<300 mV vs. Ag/AgCl). Another limiting factor may be the partial inhibition of bacterial growth in the presence of the Ore concentrate and e-waste. TherefOre, future studies should evaluate the pre-treatment of the Ore concentrate and e-waste to remove inhibitory and oxidant consuming compounds befOre bioleaching with IOB to optimize leaching yields.

Ya-li Feng - One of the best experts on this subject based on the ideXlab platform.

  • Simultaneous extraction of Gold and zinc from refractory carbonaceous Gold Ore by chlorination roasting process
    'Elsevier BV', 2020
    Co-Authors: Wang Hong-jun, Ya-li Feng, Li Hao-ran, Kang Jin-xing
    Abstract:

    A novel process based on chlorination roasting was proposed to simultaneously recover Gold and zinc from refractory carbonaceous Gold Ore by using NaCl as chlorination agent. The effects of roasting temperature, roasting time and NaCl content on the volatilization rates of Gold and zinc were investigated. The reaction mechanism and the phase transition process were also analyzed by means of SEM, EDS and XRD. The results demonstrated that under the optimal conditions of NaCl content of 10%, roasting temperature of 800 degrees C, roasting time of 4 h and gas flow rate of 1 L/min, the rates of Gold and zinc were 92% and 92.56%, respectively. During low-temperature chlorination roasting stage, a certain content of sulfur was beneficial to the chlorination reactions of Gold and zinc; and during high-temperature chlorination roasting stage, the crystal structure of vanadium-bearing mica was destroyed, and the vanadium-containing oxides were beneficial to the chlorinating volatilization of Gold and zinc. Eventually, the chlorinated volatiles of Gold and zinc could be recovered by alkaline solution

  • simultaneous extraction of Gold and zinc from refractory carbonaceous Gold Ore by chlorination roasting process
    Transactions of Nonferrous Metals Society of China, 2020
    Co-Authors: Hongjun Wang, Ya-li Feng, Li Haoran, Jinxing Kang
    Abstract:

    Abstract A novel process based on chlorination roasting was proposed to simultaneously recover Gold and zinc from refractory carbonaceous Gold Ore by using NaCl as chlorination agent. The effects of roasting temperature, roasting time and NaCl content on the volatilization rates of Gold and zinc were investigated. The reaction mechanism and the phase transition process were also analyzed by means of SEM, EDS and XRD. The results demonstrated that under the optimal conditions of NaCl content of 10%, roasting temperature of 800 °C, roasting time of 4 h and gas flow rate of 1 L/min, the rates of Gold and zinc were 92% and 92.56%, respectively. During low-temperature chlorination roasting stage, a certain content of sulfur was beneficial to the chlorination reactions of Gold and zinc; and during high-temperature chlorination roasting stage, the crystal structure of vanadium-bearing mica was destroyed, and the vanadium-containing oxides were beneficial to the chlorinating volatilization of Gold and zinc. Eventually, the chlorinated volatiles of Gold and zinc could be recovered by alkaline solution.

  • The separation of Gold and vanadium in carbonaceous Gold Ore by one-step roasting method
    Powder Technology, 2019
    Co-Authors: Hongjun Wang, Ya-li Feng, Kang Jinxing
    Abstract:

    Abstract The separation of Gold and vanadium in the refractory carbonaceous Gold Ore had been performed by one-step roasting method. The thermodynamic viability of the possible reactions in the process was analyzed based on thermodynamic data. And the effects of experimental parameters such as roasting temperature, roasting time and NaCl dosage on the recovery ratios of Gold and vanadium were investigated. Under the optimal conditions of NaCl 10%, roasting temperature 800 °C, roasting time 4 h and air gas flow rate 1 L/min, the recovery ratios of Gold and vanadium were 92% and 85.34%, respectively, realizing the effective separation of Gold and vanadium. In addition, the reaction mechanism and phase transformation during the roasting process were revealed using SEM, EDS and XRD. Results demonstrated that it was beneficial to the chlorination reaction of Gold in the presence of pyrite. In the low-temperature roasting, the chlorination reaction of Gold was dominant in the roasting process. And in the high-temperature roasting, the chlorination reaction of Gold and the sodium reaction of vanadium were dominant in the roasting process.