The Experts below are selected from a list of 72 Experts worldwide ranked by ideXlab platform
Jianjin Cao - One of the best experts on this subject based on the ideXlab platform.
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a tem study of particles carried by Ascending Gas flows from the bairendaba lead zinc deposit inner mongolia china
Ore Geology Reviews, 2019Co-Authors: Tao Jiang, Jianjin Cao, Jiannian Zeng, Zhenghai WangAbstract:Abstract In order to find deep-seated deposit, there is a need to develop non-traditional surface geochemistry. GeoGas is of particular interest. Particles transported by geoGas from the deeply concealed deposits potentially hold great information. This study investigates particles carried by Ascending Gas flows from the Bairendaba lead-zinc deposit. This deposit is covered by a thick exotic substance, which hinders probing the ore body directly. The samples were collected using a static sampling method and were analysed by transmission electron microscopy (TEM) to observe particle features (such as shape, component, size, structure, and form of polymerization); these particles contain information on buried deposits. Numerous Pb-, Zn-, and Cu-bearing particles, as well as particles containing other metal compounds, occur as individuals or aggregates in the Ascending Gas flows. Most particles have a large oxygen (O) content; this is likely caused by the course of Gas flows Ascending from the deep ore body to the ground surface. Sulphur (S) is commonly associated with Pb, Cu, As, Fe, and Sb and occurs as sulphate in this deposit. Most metallic elements occur as sulphate, oxide, and carbonate in the detected particles. In contrast to the samples collected in the peripheral area, samples collected from the concealed deposit include numerous particles containing metallogenic elements, although particles containing major elements can be found in both areas. Moreover, the trend of each Pb- or Zn-bearing particle along a unique sampling line is directly related to the distribution of the corresponding ore bodies; this indicates that the particles were generated at a certain depth, carried by the Ascending Gas flow and directly provide important information regarding the concealed ore bodies. The anomalous area can be used as a basis for further prospect analysis and improve the prospecting success rate.
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study of particles in the Ascending Gas of ruptures caused by the 2008 wenchuan earthquake
Applied Geochemistry, 2017Co-Authors: Jianjin Cao, Shuting Cheng, Songying Luo, Chang LiuAbstract:Abstract Ascending Gas is a global phenomenon. It can move upwards along faults or fissures from the interior of the Earth to the surface of the Earth. Seismically active regions near continental plate boundaries are active regions of Ascending Gas. Based on the results of previous research, abnormal concentrations of SO 2 , CO 2 , Rn, He, H 2 , O 2 , Ar, N 2 , and CH 4 in Ascending Gas may be applied to earthquake prediction. In our study, particles carried by Ascending Gas in ruptures caused by the Wenchuan earthquake have been discovered using a transmission electron microscope. It can be seen that there are far more particles in the Ascending Gas of ruptures caused by the 2008 earthquake than there are in the Ascending Gas of the non-seismic Fengguanshan fault or the Ascending Gas of the soil in Wufeng Town of Jintang County or Yuhe Village of Pengshan County (which represent background areas). The abnormal characteristics of the particles carried by the Ascending Gas of ruptures also include Cu-, Hg-, and Os-enriched particles. The typical elemental associations are Fe-Mn-Ni-Cr and Pb-Cr. SiO 2 particles contain abnormally high contents of impure elements in the form of particles that have been encapsulated by SiO 2 . This is the first study to report the presence of particles carried by Ascending Gas in earthquake ruptures. This study represents a new method of earthquake prediction. These particles can provide us with abundant and direct information about earthquake activity, which can be applied to earthquake prediction. Characteristics of the particles in the Ascending Gas, combined with the concentrations of Hg, SO 2 , CO 2 , Rn, He, H 2 , O 2 , Ar, N 2 , and CH 4 , can be used to develop a more efficient method of earthquake prediction.
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tem study on particles transported by Ascending Gas flow in the kaxiutata iron deposit inner mongolia north china
Geochemistry-exploration Environment Analysis, 2015Co-Authors: Dongle Dai, Jianjin Cao, Peixin LaiAbstract:Metal migration processes, by means of Gas-transported particles, from an iron magnetite skarn deposit beneath Quaternary transported overburden, to surface was studied at the Kaxiutata iron deposit. This study area is located in the desert of the Inner Mongolia region in northern China. Ascending Gas-transported particles were collected using passive adsorption methods; a total of 50 samples were obtained over the known mineralization (30 within the mining area and 20 from the exploration area), and 15 samples were collected over background areas for comparison. The morphology, categorization, and chemical composition of particles in these samples were determined by transmission electron microscopy (TEM). In the mining and exploration area, the particles related to the subsurface mineralization (ore-bearing particles) are primarily Fe-, Cu-, Zn-, Pb-, and Bi-bearing, and particles show significant common characteristics. Sulphur is generally absent, or its content is notably low. However, based on the geological description of primary mineralization, Cu, Zn, and Pb occur mainly as sulphides, implying that the minerals were subjected to in situ or transport-associated oxidation. Most particles are actually aggregates of various smaller particles of diverse origin. Evidence of oxidation and agglomeration of particles may reflect the high porosity and Gas permeability of the sandy overburden, which provides an oxidizing environment for Gas-transported particles. The distribution of ore-bearing particles is correlated with the subsurface mineralization. Iron-rich particles (> 30% Fe) and Cu-, Zn-, and Bi-bearing particles collected above the mining area were also collected in the exploration zone, and these types of particles are likely indicators of underlying iron mineralization. Samples collected from the background zone revealed no Cu-, Bi-, Mo-, and Pb-bearing particles. The migration mechanism of Gas-transported particles in the desert area is summarized and discussed based on this and previous studies. Supplementary material: Some of the TEM images, high resolution TEM images and SAED patterns of the particles with no relation to mineralization are supplemented in Appendix 1 which is available at http://www.geolsoc.org.uk/SUP18810.
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particles carried by Ascending Gas flow at the tongchanghe copper mine guizhou province china
Science China-earth Sciences, 2010Co-Authors: Jianjin Cao, Chang Liu, Zhihua Xiong, Tingrong QinAbstract:We collected and analyzed, using transmission electron microscopy, the particles carried by Ascending Gas flow in soil above the concealed orebody of the Tongchanghe copper mine, Guizhou Province. Particles of native copper, native copper-iron alloy, and native chromium-iron-copper alloy particles in the Ascending Gas flow were first discovered. Commonly, they were aggregations of relatively small particles. Individual particles within aggregations were subcircular, elliptical, regularly polygonal, or elongate and from 5 to 40 nm in size. The aggregations were subcircular or elliptical and 20–150 nm in size. Chloride, oxide, sulfate, and hydroxide particles containing ore-forming metals in the Ascending Gas flow were also discovered. The elements of the particles were commonly in a high valence state, suggesting that they were formed in a near-surface oxidizing environment. Discovery of the particles extracted from the Ascending Gas flow above the Tongchanghe copper mine provided a powerful tool for exploration for deep concealed orebodies. Our study also showed that native copper, native copper-iron alloys, native chromium-iron-copper alloys, as well as chloride, oxide, sulfate, and hydroxide compounds containing ore-forming metals can be transported in particle form by Ascending Gas flow below the Earth’s surface.
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simulation of adsorption of gold nanoparticles carried by Gas Ascending from the earth s interior in alluvial cover of the middle lower reaches of the yangtze river
Geofluids, 2010Co-Authors: Jianjin Cao, Zongtao Jiang, X Z ZouAbstract:The adsorption onto other minerals of charged gold nanoparticles, carried by Gas Ascending from the Earth’s interior, is an important component of their transport and deposition in surficial cover such as alluvial, aeolian, and glacial sediments. To simulate the adsorption of these particles, an experiment was conducted in which a flow of air that contained gold nanoparticles was passed upward through a sample of alluvium from the middle–lower reaches of the Yangtze River. These experiments showed that gold nanoparticles are adsorbed on kaolinite, halloysite, goethite, and hematite in the alluvial cover. Both the gold nanoparticles and minerals (i.e., kaolinite, halloysite, goethite, and hematite) carry surface charges that provide them with excellent adsorption properties. This study showed that the specific mineral composition of surficial alluvial cover affects the concentration of gold nanoparticles in the Ascending Gas. This phenomenon may plausibly be used in exploration for concealed gold, copper–gold, and silver–gold deposits in areas of thick alluvial cover. Geofluids (2010) 10, 438–446
Chenn Q. Zhou - One of the best experts on this subject based on the ideXlab platform.
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numerical methods for simulating the reduction of iron ore in blast furnace shaft
Journal of Thermal Science and Engineering Applications, 2014Co-Authors: Chenn Q. Zhou, Yan ChenAbstract:The blast furnace process is a counter-current moving bed chemical reactor to reduce iron oxides to iron, which involves complex transport phenomena and chemical reactions. The iron ore and coke are alternatively charged into the blast furnace, forming a layer by layer structural burden which is slowly descending in the counter-current direction of the Ascending Gas flow. A new methodology was proposed to efficiently simulate the Gas and solid burden flow in the counter-current moving bed in blast furnace shaft. The Gas dynamics, burden movement, chemical reactions, heat and mass transfer between the Gas phase and solid phase are included. The new methodology has been developed to explicitly consider the effects of the layer thickness thermally and chemically in the CFD model. [DOI: 10.1115/1.4025946]
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cfd modeling of multiphase reacting flow in blast furnace shaft with layered burden
Applied Thermal Engineering, 2014Co-Authors: Dong Fu, John Dalessio, Kyle J Ferron, Yongfu Zhao, Yan Chen, Chenn Q. ZhouAbstract:The ironmaking blast furnace is a counter-current chemical reactor which includes the Ascending Gas flow and the counter-current descending porous bed (burden). A Computational Fluid Dynamics (CFD) model has been developed to simulate the multiphase reacting flow in blast furnace shaft. The Gas flow dynamics, burden movement, chemical reactions, heat and mass transfer between the Gas phase and burden phase are included in the CFD model. The blast furnace burden consists of alternative layers of iron ore and coke. A novel methodology is proposed to efficiently model the effects of alternative burden layer structure on Gas flow, heat transfer, mass transfer and chemical reactions. Different reactions and heat transfer characteristics are applied for difference types of layer. In addition, the layered CFD model accurately predicts the Cohesive Zone (CZ) shape where the melting of solid burden taking place. The shape and location of the CZ are determined by an iterative method based on the ore temperature distribution. The theoretical formation and the methodology of the CFD model are presented and the model is applied to simulate industry blast furnaces. The proposed method can be applied to investigate the blast furnace shaft process and other moving bed system with periodic burden structure configuration.
Fuli Deng - One of the best experts on this subject based on the ideXlab platform.
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a novel separation technique Gas assisted three liquid phase extraction for treatment of the phenolic wastewater
Separation and Purification Technology, 2010Co-Authors: Pinhua Yu, Kun Huang, Junmei Zhao, Chao Zhang, Fuli DengAbstract:A novel technique, Gas-assisted three-liquid-phase extraction (GATE), was proposed to improve three-liquid-phase separation of p-nitrophenol (p-NP) and o-nitrophenol (o-NP) from wastewater. The partition behavior of p-NP and o-NP into a three-liquid-phase system composed of hexane-PEG2000-(NH(4))(2)SO(4)-H(2)O at the aid of Gas bubbling was discussed. It was demonstrated that the process of Gas bubbling was effective for the mass transfer of p-NP and o-NP into PEG phase and hexane phase, respectively. Influences of various parameters including the phase-forming salt concentrations, Gas flow rate, Gas bubbling time, initial volume of hexane and PEG phase on distribution behavior of p-NP and o-NP were investigated. Under the optimal conditions for GATE, the removal ratio of p-NP and o-NP from wastewater could reach 81% and 90%, respectively. While the mass fraction of p-NP into PEG phase and o-NP into hexane phase arrived at 75% and 74%, respectively. The distribution ratio and concentration factor were all higher than conventional three-liquid-phase extraction system. During GATE processes, the dispersed PEG and hexane in (NH(4))(2)SO(4) aqueous solution can be captured by Ascending Gas streams. GATE is demonstrated to be an effective method for the simultaneously extraction and separation of two or more organic chemicals in one-step's three-liquid-phase extraction, and also provides a technique to prevent loss of dispersed polymers and organic solvents in aqueous phase in extraction process for treatment of the phenolic wastewater. (C) 2010 Elsevier B.V. All rights reserved.
Yan Chen - One of the best experts on this subject based on the ideXlab platform.
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numerical methods for simulating the reduction of iron ore in blast furnace shaft
Journal of Thermal Science and Engineering Applications, 2014Co-Authors: Chenn Q. Zhou, Yan ChenAbstract:The blast furnace process is a counter-current moving bed chemical reactor to reduce iron oxides to iron, which involves complex transport phenomena and chemical reactions. The iron ore and coke are alternatively charged into the blast furnace, forming a layer by layer structural burden which is slowly descending in the counter-current direction of the Ascending Gas flow. A new methodology was proposed to efficiently simulate the Gas and solid burden flow in the counter-current moving bed in blast furnace shaft. The Gas dynamics, burden movement, chemical reactions, heat and mass transfer between the Gas phase and solid phase are included. The new methodology has been developed to explicitly consider the effects of the layer thickness thermally and chemically in the CFD model. [DOI: 10.1115/1.4025946]
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cfd modeling of multiphase reacting flow in blast furnace shaft with layered burden
Applied Thermal Engineering, 2014Co-Authors: Dong Fu, John Dalessio, Kyle J Ferron, Yongfu Zhao, Yan Chen, Chenn Q. ZhouAbstract:The ironmaking blast furnace is a counter-current chemical reactor which includes the Ascending Gas flow and the counter-current descending porous bed (burden). A Computational Fluid Dynamics (CFD) model has been developed to simulate the multiphase reacting flow in blast furnace shaft. The Gas flow dynamics, burden movement, chemical reactions, heat and mass transfer between the Gas phase and burden phase are included in the CFD model. The blast furnace burden consists of alternative layers of iron ore and coke. A novel methodology is proposed to efficiently model the effects of alternative burden layer structure on Gas flow, heat transfer, mass transfer and chemical reactions. Different reactions and heat transfer characteristics are applied for difference types of layer. In addition, the layered CFD model accurately predicts the Cohesive Zone (CZ) shape where the melting of solid burden taking place. The shape and location of the CZ are determined by an iterative method based on the ore temperature distribution. The theoretical formation and the methodology of the CFD model are presented and the model is applied to simulate industry blast furnaces. The proposed method can be applied to investigate the blast furnace shaft process and other moving bed system with periodic burden structure configuration.
Zhenghai Wang - One of the best experts on this subject based on the ideXlab platform.
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a tem study of particles carried by Ascending Gas flows from the bairendaba lead zinc deposit inner mongolia china
Ore Geology Reviews, 2019Co-Authors: Tao Jiang, Jianjin Cao, Jiannian Zeng, Zhenghai WangAbstract:Abstract In order to find deep-seated deposit, there is a need to develop non-traditional surface geochemistry. GeoGas is of particular interest. Particles transported by geoGas from the deeply concealed deposits potentially hold great information. This study investigates particles carried by Ascending Gas flows from the Bairendaba lead-zinc deposit. This deposit is covered by a thick exotic substance, which hinders probing the ore body directly. The samples were collected using a static sampling method and were analysed by transmission electron microscopy (TEM) to observe particle features (such as shape, component, size, structure, and form of polymerization); these particles contain information on buried deposits. Numerous Pb-, Zn-, and Cu-bearing particles, as well as particles containing other metal compounds, occur as individuals or aggregates in the Ascending Gas flows. Most particles have a large oxygen (O) content; this is likely caused by the course of Gas flows Ascending from the deep ore body to the ground surface. Sulphur (S) is commonly associated with Pb, Cu, As, Fe, and Sb and occurs as sulphate in this deposit. Most metallic elements occur as sulphate, oxide, and carbonate in the detected particles. In contrast to the samples collected in the peripheral area, samples collected from the concealed deposit include numerous particles containing metallogenic elements, although particles containing major elements can be found in both areas. Moreover, the trend of each Pb- or Zn-bearing particle along a unique sampling line is directly related to the distribution of the corresponding ore bodies; this indicates that the particles were generated at a certain depth, carried by the Ascending Gas flow and directly provide important information regarding the concealed ore bodies. The anomalous area can be used as a basis for further prospect analysis and improve the prospecting success rate.
