The Experts below are selected from a list of 6108 Experts worldwide ranked by ideXlab platform
Bo Feng - One of the best experts on this subject based on the ideXlab platform.
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The flotation separation of galena and pyrite using serpentine as depressant
Powder Technology, 2019Co-Authors: Bo Feng, Wenpu Zhang, Huihui Wang, Tao Wang, Guichun HeAbstract:Abstract Toxic inorganic depressants are commonly used in the flotation separation of polymetallic sulfide ores and it is desirable that they can be replaced by environmentally benign substances. Serpentine, a common Gangue Mineral encountered in complex sulfide ores, has been found to be an efficient depressant for ferric sulfide (e.g., pyrite). Serpentine was tested as a potential selective depressant in the differential flotation separation of galena and pyrite using potassium butyl xanthate (PBX) as a collector. In single Mineral flotation, serpentine depressed the −150 + 74 μm and −74 + 37 μm galena while the −10 μm galena was floatable. Different from galena, serpentine has strong depression effect on all the three sizes of pyrite. So the flotation separation of fine grained galena and pyrite can be achieved. A concentrate with Pb grade of 65.09% and recovery of 67.72% can be achieved in the mixed Minerals flotation when serpentine was added as depressant. Mechanism studies indicated that serpentine particles attach to the surface of pyrite more easily.
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Talc–serpentine interactions and implications for talc depression
Minerals Engineering, 2012Co-Authors: Bo Feng, Yi-ping Lu, Mingyang Zhang, Qiming Feng, Yanling GuAbstract:Abstract The interactions of serpentine with talc and implications for talc depression by carboxymethyl cellulose (CMC) have been investigated through flotation tests, sedimentation tests and zeta potential measurements. Talc is a hydrophobic Mineral and CMC is effective for talc depression. At pH value 9, where flotation of nickel sulfide ores is routinely performed, the two magnesium silicate bearing (MgO) Gangue Minerals are oppositely charged and therefore attract through an electrostatic mechanism. Slime coatings of serpentine adhere to the surface of talc, reducing talc flotation recovery to some extent, but also causing problem to its depression by CMC as serpentine is a hydrophylic Gangue Mineral which cannot be depressed by CMC depressant. Pretreatment of serpentine with acid leaching results in a shift of the zero charge points, from pH value 10.2 to 6.8 and the leached serpentine is negatively charged at pH 9. The negatively charged serpentine does not interfere with the talc depression by CMC. Adsorption of sodium hexametaphosphate (SHMP) at the serpentine/solution interface also compensates the positive charge on the serpentine particle and its zeta potential is rendered negative. When the serpentine surface is negatively charged, a repulsive interaction energy generates and serpentine slimes drop off from the surface of talc, allowing talc to once again be depressed by CMC.
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talc serpentine interactions and implications for talc depression
Minerals Engineering, 2012Co-Authors: Bo Feng, Qiming Feng, Mingyang ZhangAbstract:Abstract The interactions of serpentine with talc and implications for talc depression by carboxymethyl cellulose (CMC) have been investigated through flotation tests, sedimentation tests and zeta potential measurements. Talc is a hydrophobic Mineral and CMC is effective for talc depression. At pH value 9, where flotation of nickel sulfide ores is routinely performed, the two magnesium silicate bearing (MgO) Gangue Minerals are oppositely charged and therefore attract through an electrostatic mechanism. Slime coatings of serpentine adhere to the surface of talc, reducing talc flotation recovery to some extent, but also causing problem to its depression by CMC as serpentine is a hydrophylic Gangue Mineral which cannot be depressed by CMC depressant. Pretreatment of serpentine with acid leaching results in a shift of the zero charge points, from pH value 10.2 to 6.8 and the leached serpentine is negatively charged at pH 9. The negatively charged serpentine does not interfere with the talc depression by CMC. Adsorption of sodium hexametaphosphate (SHMP) at the serpentine/solution interface also compensates the positive charge on the serpentine particle and its zeta potential is rendered negative. When the serpentine surface is negatively charged, a repulsive interaction energy generates and serpentine slimes drop off from the surface of talc, allowing talc to once again be depressed by CMC.
Laurent Bailly - One of the best experts on this subject based on the ideXlab platform.
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Antimony in quartz as a vector to Mineralization: A statistical approach from five Variscan Sb occurrences (France)
Journal of Geochemical Exploration, 2021Co-Authors: Loïs Monnier, Stefano Salvi, Anthony Pochon, Jérémie Melleton, Didier Béziat, Philippe Lach, Laurent BaillyAbstract:Using in-situ LA-ICP-MS, the trace-elements compositions of hydrothermal quartz from five Sb Mineralized Variscan districts, from different parts of France, were compared. Each of these districts is characterized by the presence of stibnite, with quartz being an ubiquitous Gangue Mineral. The resulting dataset was processed using a set of multivariate statistical analyses (i.e. principal component analysis, hierarchical cluster analysis, and permutational multivariate analysis of variance). This approach highlights differences in ore-forming processes (e.g., fluid chemistry), recorded in the trace-elements pattern of the Gangue Minerals. Using this methodology, we could distinguish different Mineralizing events with intricate paragenesis, such as those in the Sioule nappe, which appear to have recorded two different events of Sb precipitation. Results indicate that Sb incorporation in quartz is weakly correlated to other trace elements, but that its contents increase sharply in quartz from stibnite-bearing veins. In this case, Sb shows values >10 ppm and up to 200 ppm, considerably higher than the values measured in quartz unrelated to Sb Mineralization (mainly ≤ 1 ppm). Intermediate Sb contents in quartz would point to the potential for a fluid to precipitate Sb ore. It is concluded that incorporation of Sb in quartz can be confidentially correlated to its content in the Mineralizing fluid. Based on our data from five Sb districts of the French Variscan belt, supported by published Sb trace-elements data in quartz from a number of other Sb deposits worldwide, this study highlights the strong potential of the Sb content in quartz as a proxy for tracing Sb Mineralization.
Rehanul Haq Siddiqui - One of the best experts on this subject based on the ideXlab platform.
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Genesis of Manganese Deposits in the Ali Khanzai Block of the Zhob Ophiolite, Pakistan: Inferences from Geochemistry and Mineralogy
Journal of Earth Science, 2020Co-Authors: Muhammad Ayoub Khan, Muhammad Ishaq Kakar, Thomas Ulrich, Liaqat Ali, Andrew C. Kerr, Khalid Mahmood, Rehanul Haq SiddiquiAbstract:The Zhob ophiolite comprises the Naweoba, Omzha and Ali Khanzai blocks, which are surrounded by the sediments of the Alozai Group and Loralai Formation. The Ali Khanzai Block contains metamorphic, ultramafic, gabbroic, volcanic and volcaniclastic rocks with associated chert. The Zhob manganese deposits found in the Ali Khanzai Block, occur in banded, lenticular and massive forms within red to brown coloured metachert. Braunite and pyrolusite are the main constituent manganese-bearing Minerals with minor hausmannite, hematite and barite while quartz is the major Gangue Mineral with some carbonate Minerals. Geochemical evidence from the major oxides indicates that the manganese Mineralization and associated metachert at Zhob were formed by hydrothermal activity with little contribution from contemporaneous volcanic materials and this is confirmed by high Fe/Mn and low Co/Zn ratios and trace element patterns. These deposits formed along with seafloor spreading centres and were later obducted as part of Ali Khanzai Block of Zhob ophiolite.
Loïs Monnier - One of the best experts on this subject based on the ideXlab platform.
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Antimony in quartz as a vector to Mineralization: A statistical approach from five Variscan Sb occurrences (France)
Journal of Geochemical Exploration, 2021Co-Authors: Loïs Monnier, Stefano Salvi, Anthony Pochon, Jérémie Melleton, Didier Béziat, Philippe Lach, Laurent BaillyAbstract:Using in-situ LA-ICP-MS, the trace-elements compositions of hydrothermal quartz from five Sb Mineralized Variscan districts, from different parts of France, were compared. Each of these districts is characterized by the presence of stibnite, with quartz being an ubiquitous Gangue Mineral. The resulting dataset was processed using a set of multivariate statistical analyses (i.e. principal component analysis, hierarchical cluster analysis, and permutational multivariate analysis of variance). This approach highlights differences in ore-forming processes (e.g., fluid chemistry), recorded in the trace-elements pattern of the Gangue Minerals. Using this methodology, we could distinguish different Mineralizing events with intricate paragenesis, such as those in the Sioule nappe, which appear to have recorded two different events of Sb precipitation. Results indicate that Sb incorporation in quartz is weakly correlated to other trace elements, but that its contents increase sharply in quartz from stibnite-bearing veins. In this case, Sb shows values >10 ppm and up to 200 ppm, considerably higher than the values measured in quartz unrelated to Sb Mineralization (mainly ≤ 1 ppm). Intermediate Sb contents in quartz would point to the potential for a fluid to precipitate Sb ore. It is concluded that incorporation of Sb in quartz can be confidentially correlated to its content in the Mineralizing fluid. Based on our data from five Sb districts of the French Variscan belt, supported by published Sb trace-elements data in quartz from a number of other Sb deposits worldwide, this study highlights the strong potential of the Sb content in quartz as a proxy for tracing Sb Mineralization.
Muhammad Ayoub Khan - One of the best experts on this subject based on the ideXlab platform.
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Genesis of Manganese Deposits in the Ali Khanzai Block of the Zhob Ophiolite, Pakistan: Inferences from Geochemistry and Mineralogy
Journal of Earth Science, 2020Co-Authors: Muhammad Ayoub Khan, Muhammad Ishaq Kakar, Thomas Ulrich, Liaqat Ali, Andrew C. Kerr, Khalid Mahmood, Rehanul Haq SiddiquiAbstract:The Zhob ophiolite comprises the Naweoba, Omzha and Ali Khanzai blocks, which are surrounded by the sediments of the Alozai Group and Loralai Formation. The Ali Khanzai Block contains metamorphic, ultramafic, gabbroic, volcanic and volcaniclastic rocks with associated chert. The Zhob manganese deposits found in the Ali Khanzai Block, occur in banded, lenticular and massive forms within red to brown coloured metachert. Braunite and pyrolusite are the main constituent manganese-bearing Minerals with minor hausmannite, hematite and barite while quartz is the major Gangue Mineral with some carbonate Minerals. Geochemical evidence from the major oxides indicates that the manganese Mineralization and associated metachert at Zhob were formed by hydrothermal activity with little contribution from contemporaneous volcanic materials and this is confirmed by high Fe/Mn and low Co/Zn ratios and trace element patterns. These deposits formed along with seafloor spreading centres and were later obducted as part of Ali Khanzai Block of Zhob ophiolite.
