The Experts below are selected from a list of 327 Experts worldwide ranked by ideXlab platform
Xuewen Wang - One of the best experts on this subject based on the ideXlab platform.
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The role of CaO in the extraction of Ni and Mo from Carbonaceous Shale by calcification roasting, sulphation roasting and water leaching
International Journal of Mineral Processing, 2011Co-Authors: Xuewen Wang, Mingyu Wang, Jun Peng, Yuan XiaoAbstract:Abstract The role of CaO in the extraction of Ni and Mo from Carbonaceous Shale by calcification roasting, sulphation roasting and water leaching was studied. Experimental results showed that 97.23% Mo and 93.16% Ni were extracted from the Ni–Mo ore by mixing 100 g the raw Ni–Mo ore with 36 g CaO and grinding to less than 106 μm, then oxidation roasting at 700 °C for 2 h, sulphation roasting with 70 ml 98% sulphuric acid at 240 °C for 2 h and, water leaching at 98 °C for 2 h with a liquid/solid ratio of 2:1. But only 60.67% Ni was extracted for the oxidation roasting without adding CaO. The addition of CaO in the ore is both propitious to environment protection and nickel extraction. XRD analysis showed that the nickel in the calcification roasted ore was in the form of NiO, while the nickel in the oxidation roasted ore was in the form of NiFeO 4 . It was found that the NiFeO 4 formed in the oxidation roasted Ni–Mo ore was included by chemically inert iron silicates, which results in the NiFeO 4 irresolvable in sulphuric acid. Experiments confirmed that CaO can decompose not only the NiFe 2 O 4 but also the iron silicates at the roasting temperature.
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Extraction of molybdenum and nickel from Carbonaceous Shale by oxidation roasting, sulphation roasting and water leaching
Hydrometallurgy, 2010Co-Authors: Mingyu Wang, Xuewen WangAbstract:Abstract The extraction of molybdenum and nickel from a Carbonaceous Shale ore was investigated by oxidation roasting, followed by sulphation roasting and water leaching. The results indicated that this process was an efficient method for the extraction of molybdenum and nickel from the ore. Sulphation roasting promotes the reaction of sulphuric acid with molybdenum and nickel oxides and also decomposes the molybdenum-bearing mineral phase powellite in the roasted Ni–Mo ore. Under the optimum experimental conditions (sulphation roasting at 240 °C for 1 h; 32 ml sulphuric acid/100 g roasted Ni–Mo ore; water leaching for 2 h. at 98 °C with a liquid-to-solid ratio of 2:1), the water leach extracted 92.1% Mo and 83.5% Ni.
Shi Guanzhong - One of the best experts on this subject based on the ideXlab platform.
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Redox condition and organic carbon accumulation mechanism in the Cryogenian Nanhua Basin, South China: Insights from iron chemistry and sulfur, carbon, oxygen isotopes of the Datangpo Formation
Advances in Geo-Energy Research, 2019Co-Authors: Wang Chaoyong, Shi GuanzhongAbstract:Global glaciation, oxidation event and eukaryotic expansion and diversification in the Neoproterozoic period are marked events that characterize the early evolution of the Earth, but how the interactions occurred among these events is not well understood. The organic matters preserved in the black Shales of the Datangpo Formation (Cryogenian period) are sensitive to redox conditions, and thus its accumulation and preservation offer beneficial clues to unravel the early evolutional history of the Earth. This study presents new chemostratigraphic data of iron component, TOC content, sulfur isotope of pyrite, carbon and oxygen isotopes of Carbonaceous Shale of the Datangpo Formation (Cryogenian period) in the Datangpo section, South China. The analyzed results imply abundant nutrients existing in the ocean in the Early Cryogenian. The nutrients, such as phosphorus, resulting from neighbor volcanic eruptions, provided nutrients that enabled microbes to flourish during the Cryogenian interglacial gap. Iron components and sulfur isotopes indicated anoxic, euxinic deep water environments for the black Shales in the lower portion of the Datangpo Formation. The anoxic setting was good for the preservation of organic matter, but terrigenous materials inputs, as revealed by the high Al2O3 contents, diluted the organic carbon content (TOC).Cited as: Wang, C., Shi, G. Redox condition and organic carbon accumulation mechanism in the Cryogenian Nanhua Basin, South China: Insights from iron chemistry and sulfur, carbon, oxygen isotopes of the Datangpo Formation. Advances in Geo-Energy Research, 2019, 3(1): 67-75, doi: 10.26804/ager.2019.01.0
Hongzhuan Liu - One of the best experts on this subject based on the ideXlab platform.
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leaching of vanadium from Carbonaceous Shale
Hydrometallurgy, 2009Co-Authors: Xiangyang Zhou, Hongzhuan LiuAbstract:Abstract The leaching of vanadium from Carbonaceous Shale using dilute H 2 SO 4 was investigated, and the mechanism of leaching determined. The results showed that higher leaching efficiency of vanadium was obtained by increasing initial concentration of H 2 SO 4 , raising leaching temperature and prolonging leaching time. Addition of ammonium fluoride also enhanced recovery. A recovery of 92% was obtained using a liquid to solid ratio 4:1, initial H 2 SO 4 concentration 18%, NH 4 F addition 4.8 wt.% of Carbonaceous Shale, leaching temperature 95 °C and contact time 8 h; the recovery was only 56% without NH 4 F. The presence of NH 4 F enhanced the leaching of vanadiferous mica.
Guanzhong Shi - One of the best experts on this subject based on the ideXlab platform.
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redox condition and organic carbon accumulation mechanism in the cryogenian nanhua basin south china insights from iron chemistry and sulfur carbon oxygen isotopes of the datangpo formation
Advances in Geo-Energy Research, 2019Co-Authors: Chaoyong Wang, Guanzhong ShiAbstract:Global glaciation, oxidation event and eukaryotic expansion and diversification in the Neoproterozoic period are marked events that characterize the early evolution of the Earth, but how the interactions occurred among these events is not well understood. The organic matters preserved in the black Shales of the Datangpo Formation (Cryogenian period) are sensitive to redox conditions, and thus its accumulation and preservation offer beneficial clues to unravel the early evolutional history of the Earth. This study presents new chemostratigraphic data of iron component, TOC content, sulfur isotope of pyrite, carbon and oxygen isotopes of Carbonaceous Shale of the Datangpo Formation (Cryogenian period) in the Datangpo section, South China. The analyzed results imply abundant nutrients existing in the ocean in the Early Cryogenian. The nutrients, such as phosphorus, resulting from neighbor volcanic eruptions, provided nutrients that enabled microbes to flourish during the Cryogenian interglacial gap. Iron components and sulfur isotopes indicated anoxic, euxinic deep water environments for the black Shales in the lower portion of the Datangpo Formation. The anoxic setting was good for the preservation of organic matter, but terrigenous materials inputs, as revealed by the high Al2O3 contents, diluted the organic carbon content (TOC).
Mingyu Wang - One of the best experts on this subject based on the ideXlab platform.
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The role of CaO in the extraction of Ni and Mo from Carbonaceous Shale by calcification roasting, sulphation roasting and water leaching
International Journal of Mineral Processing, 2011Co-Authors: Xuewen Wang, Mingyu Wang, Jun Peng, Yuan XiaoAbstract:Abstract The role of CaO in the extraction of Ni and Mo from Carbonaceous Shale by calcification roasting, sulphation roasting and water leaching was studied. Experimental results showed that 97.23% Mo and 93.16% Ni were extracted from the Ni–Mo ore by mixing 100 g the raw Ni–Mo ore with 36 g CaO and grinding to less than 106 μm, then oxidation roasting at 700 °C for 2 h, sulphation roasting with 70 ml 98% sulphuric acid at 240 °C for 2 h and, water leaching at 98 °C for 2 h with a liquid/solid ratio of 2:1. But only 60.67% Ni was extracted for the oxidation roasting without adding CaO. The addition of CaO in the ore is both propitious to environment protection and nickel extraction. XRD analysis showed that the nickel in the calcification roasted ore was in the form of NiO, while the nickel in the oxidation roasted ore was in the form of NiFeO 4 . It was found that the NiFeO 4 formed in the oxidation roasted Ni–Mo ore was included by chemically inert iron silicates, which results in the NiFeO 4 irresolvable in sulphuric acid. Experiments confirmed that CaO can decompose not only the NiFe 2 O 4 but also the iron silicates at the roasting temperature.
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Extraction of molybdenum and nickel from Carbonaceous Shale by oxidation roasting, sulphation roasting and water leaching
Hydrometallurgy, 2010Co-Authors: Mingyu Wang, Xuewen WangAbstract:Abstract The extraction of molybdenum and nickel from a Carbonaceous Shale ore was investigated by oxidation roasting, followed by sulphation roasting and water leaching. The results indicated that this process was an efficient method for the extraction of molybdenum and nickel from the ore. Sulphation roasting promotes the reaction of sulphuric acid with molybdenum and nickel oxides and also decomposes the molybdenum-bearing mineral phase powellite in the roasted Ni–Mo ore. Under the optimum experimental conditions (sulphation roasting at 240 °C for 1 h; 32 ml sulphuric acid/100 g roasted Ni–Mo ore; water leaching for 2 h. at 98 °C with a liquid-to-solid ratio of 2:1), the water leach extracted 92.1% Mo and 83.5% Ni.