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Wu Chao - One of the best experts on this subject based on the ideXlab platform.
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Test Method of Spontaneous Combustion Tendency of Sulfide Ores in Laboratory and Its Application
Safety and Environmental Engineering, 2020Co-Authors: Wu ChaoAbstract:The prevention and control on spontaneous combustion of Sulfide Ores are always the main safety problem for Sulfide ore deposits.It is very important to exactly measure the spontaneous combustion tendency of Sulfide Ores in order to protect the safety of miners' life,maintain the normal production of mine and make good utilization of the natural resources.By roundly and systematically analyzing the existing measurement techniques,this paper introduces a reliable technique of spontaneous combustion tendency of Sulfide Ores in laboratory measurement and expounds each process concretely.Finally,good results were achieved when the method was used in a mine case.
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Experiment on Coupling of Wet Agents Composed with Anionic Surfactants and Dust of Sulfide Ores
Journal of China University of Mining and Technology, 2020Co-Authors: Wu ChaoAbstract:In order to investigate the coupling of wet agents and dust,the influencing factors of three anionic wet agents including mass concentration,temperature,additive of sodium sulfate in the wet agent solutions on ten dust samples of Sulfide Ores were studied by the downward capillary seep experiment.The results show that:1) To some dust of Sulfide Ores,the lager the mass concentration of wetting agent is,the poorer the wet ability is when the solution temperature is near 20 ℃;2) The oxidation behavior of Sulfide Ores has little influence on the wet ability of wetting agents;3) Wet agent solution added sodium sulfate can improve the wet ability of Sulfide dust,and the cost of wet agents can be reduced because the sodium sulfate is much cheaper than the surfactants;4) The wet ability mainly depends on temperature of the solution;it can increase with the increasing of the temperature between 20 ℃ and 35 ℃,little change between 35 ℃ and 55 ℃,and that decrease while more than 55 ℃.
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Research on ANN Dynamic Prediction Model for Spontaneous Combustion of Sulfide Ores with Multi-factors Coupling
China Safety Science Journal, 2020Co-Authors: Wu ChaoAbstract:Spontaneous combustion of Sulfide Ores is caused by the coupling of multi-factors and multi-fields and it is a typical nonlinear problem.Based on the field survey and theoretic analysis,An ANN(Artificial Neural Network) forecasting model for Sulfide ore spontaneous combustion,which takes the three factors of the content of sulfur,ventilation intensity,environmental temperature as the input variables of this model,has been built with the help of Matlab(Matrix Laboratory) software.After the simulation through samples study and by combining field data,it shows that the predicting result is basically in accordance with the observation data,and the average error can be controlled within ten percent with satisfactory results.The research fruit provides a new approach and a route for preventing the spontaneous combustion of Sulfide ore,which is of great significance both theoretically and practically.
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Study of Risk Assessment Technique for Evaluating the Spontaneous Combustion of Sulfide Ore in Mining Stope
Fire Safety Science, 2020Co-Authors: Wu ChaoAbstract:During mining of Sulfide Ores at non-coal mines, there are many spontaneous fire accidents due to Ores with rich Sulfide. Therefore, it is very significant to develop an effective risk assessment technique. In this paper, the authors summarized existed assessment methods of spontaneous fire of Sulfide Ores, and established a new risk assessment system based on experiments and literature review. The authors applied the assessment method of the fire and explosion index evaluation of DOW company to analyze the dangerous factors that may cause spontaneous fire accidents of Sulfide Ores. Accordingly, all relevant indexes at various dangerous ranks were put forward on referring the mining field situations. Furthermore, the assessment method was applied for assessing the fire potential of a mine with Sulfide Ores in Xinjiang. In the evaluation process the practicality in the production of the mines is considered. All the dangerous factors can be obtained from experiments or investigations of mining site. The risk assessment system can be applied to all the Sulfide mines.
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Prediction and Forecast Techniques of Spontaneous Combustion of Sulfide Ore Piles
China Safety Science Journal, 2020Co-Authors: Wu Chao, Huang Xiao-meiAbstract:By referring to lots of research fruits on coal spontaneous combustion theory, and combining with the research status of spontaneous combustion of Sulfide Ores over the world, the prediction and forecast techniques of spontaneous combustion of Sulfide ore piles were analyzed systematically. The oxidation and self-heating mechanism of Sulfide Ores was summarized. Predicting techniques, such as test method of spontaneous combustion tendency, comprehensive factors estimation, statistic and empirical method, were introduced in details. The connections of spontaneous combustion process between coal and Sulfide Ores were found out, and the mathematical model prediction method was brought forward. Moreover, significant gas analysis and temperature measuring forecast method were expounded. Finally, the prediction and forecast techniques of spontaneous combustion of Sulfide ore piles were prospected, which is of great significance for Sulfide ore production.
Dexin Xiong - One of the best experts on this subject based on the ideXlab platform.
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pge geochemistry and re os dating of massive Sulfide Ores from the baimazhai cu ni deposit yunnan province china
Lithos, 2008Co-Authors: Shengwei Wang, Dexin Xiong, Wenjun Qu, Andao DuAbstract:Abstract The Baimazhai deposit in Yunnan Province is one of the largest Cu–Ni Sulfide deposits hosted in mafic–ultramafic intrusions in China. Concentrations of platinum-group elements (PGE) in massive Sulfide Ores and host rocks from Baimazhai were determined by using inductively coupled plasma mass spectrometry (ICP-MS) following nickel Sulfide fire assay pre-concentration. The results show that the total PGE (ΣPGE) are quite low, decreasing gradually from central massive Ores (78.2–556 ppb) to olivine pyroxenite (0.472–67.0 ppb), gabbro (0.847 ppb) and, websterite (0.76–0.809). The intruded lamprophyre dykes also show low ΣPGE (2.98–4.07 ppb). The ΣPGE exhibit obvious positive correlations with Au, Ni and Cu contents. Primitive mantle normalized PGE patterns of the massive Cu–Ni Ores are of the Pt–Pd type with relatively steep and trough-like patterns, which are similar to those of the host rocks. In addition, the Pt/Pd and Cu/Pd ratios of the massive Sulfide Ores are similar to those of olivine pyroxenite, gabbro and websterite. These characteristics suggest that Sulfides in the massive Ores are of magmatic origin, co-genetic with their host rocks. The relatively high Pt/Pd ratios of the Baimazhai massive Sulfide Ores (averaging 0.83) and their host rocks imply that the Baimazhai Sulfides formed in a single Sulfide saturation event, but not through multiple Sulfide injections. High Ir contents (0.77–5.52 ppb, averaging 2.35 ppb) and dramatically variable Pd/Ir ratios (4.76–296, averaging 138) of the massive Sulfide Ores suggest that the Baimazhai Sulfide Ores might have suffered significant late stage hydrothermal alteration. The Baimazhai massive Sulfide Ores yield a Re–Os isochron age of 259 ± 20 Ma (MSWD = 0.025), which is the same as the major eruption stage of the Emeishan large igneous province and the Baimazhai intrusion, further supporting their magmatic origin. The initial 187Os/188Os value of 0.456 ± 0.026 indicates that crustal contamination has played an important role during mineralization. The proportion of crust-derived Os is calculated to be more than 30%.
Andao Du - One of the best experts on this subject based on the ideXlab platform.
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pge geochemistry and re os dating of massive Sulfide Ores from the baimazhai cu ni deposit yunnan province china
Lithos, 2008Co-Authors: Shengwei Wang, Dexin Xiong, Wenjun Qu, Andao DuAbstract:Abstract The Baimazhai deposit in Yunnan Province is one of the largest Cu–Ni Sulfide deposits hosted in mafic–ultramafic intrusions in China. Concentrations of platinum-group elements (PGE) in massive Sulfide Ores and host rocks from Baimazhai were determined by using inductively coupled plasma mass spectrometry (ICP-MS) following nickel Sulfide fire assay pre-concentration. The results show that the total PGE (ΣPGE) are quite low, decreasing gradually from central massive Ores (78.2–556 ppb) to olivine pyroxenite (0.472–67.0 ppb), gabbro (0.847 ppb) and, websterite (0.76–0.809). The intruded lamprophyre dykes also show low ΣPGE (2.98–4.07 ppb). The ΣPGE exhibit obvious positive correlations with Au, Ni and Cu contents. Primitive mantle normalized PGE patterns of the massive Cu–Ni Ores are of the Pt–Pd type with relatively steep and trough-like patterns, which are similar to those of the host rocks. In addition, the Pt/Pd and Cu/Pd ratios of the massive Sulfide Ores are similar to those of olivine pyroxenite, gabbro and websterite. These characteristics suggest that Sulfides in the massive Ores are of magmatic origin, co-genetic with their host rocks. The relatively high Pt/Pd ratios of the Baimazhai massive Sulfide Ores (averaging 0.83) and their host rocks imply that the Baimazhai Sulfides formed in a single Sulfide saturation event, but not through multiple Sulfide injections. High Ir contents (0.77–5.52 ppb, averaging 2.35 ppb) and dramatically variable Pd/Ir ratios (4.76–296, averaging 138) of the massive Sulfide Ores suggest that the Baimazhai Sulfide Ores might have suffered significant late stage hydrothermal alteration. The Baimazhai massive Sulfide Ores yield a Re–Os isochron age of 259 ± 20 Ma (MSWD = 0.025), which is the same as the major eruption stage of the Emeishan large igneous province and the Baimazhai intrusion, further supporting their magmatic origin. The initial 187Os/188Os value of 0.456 ± 0.026 indicates that crustal contamination has played an important role during mineralization. The proportion of crust-derived Os is calculated to be more than 30%.
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The 982 Ma Re-Os age of copper-nickel Sulfide Ores in the Baotan area, Guangxi and its geological significance
Science China-earth Sciences, 2002Co-Authors: Andao DuAbstract:Re-Os dating on copper-nickel Sulfide Ores from the Baotan area, Guangxi, yielded an ore-forming age of 982 ± 21 Ma (2σ), which demonstrates that copper-nickel Sulfide deposits and their related mafic-ultramafic rocks occurred in the same period of time with the ophiolites in northeastern Jiangxi. Both of them are the products of collision-convergence between the Cathaysian plate and Yangtze plate and the subsequent extensional environment. Calculation of the γOs of the 982 Ma copper-nickel Sulfide Ores and its correlation with Re/Os indicate that injection-type massive Ores display lower γOs values (-15.6 to -8.2) and lower Re/Os ratios (0.32 to 0.43), while basal liquation-type Ores have γOs-27.9 to -7.3 and Re/Os=5.36 to 11.24. This suggests that these copper-nickel Sulfide Ores and their related mafic-ultramafic rocks were derived from a Re-depleted mantle source and that contamination with some crustal material occurred during their intrusion.
Wenli Zhou - One of the best experts on this subject based on the ideXlab platform.
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distilling zinc with zinc Sulfide Ores the technology of qing dynasty zinc production in guiyang central south china
Journal of Archaeological Science: Reports, 2020Co-Authors: Ya Xiao, Linheng Mo, Jianli Chen, Wenli ZhouAbstract:Abstract It is difficult to distill metal zinc partly due to the reduction temperature of zinc oxide Ores close to the boiling point of metallic zinc. The treatment of zinc Sulfide Ores is more complicated since they have to be roasted before smelting. Previous archaeometallurgical studies on zinc smelting technology in China mainly focus on the distillation of zinc oxide Ores. This paper, for the first time, presents analytical results of archaeological evidence about the distillation of zinc Sulfide Ores in Guiyang in southern China dated back to the Qing Dynasty (CE 1636–1912). The smelting remains including Ores, distillation retorts and slags, especially the roasting hearths and zinc calcine firstly discovered and confirmed in zinc smelting sites were characterized comprehensively by p-XRF, OM, SEM-EDS and XRD. It was revealed that the zinc smelting technology in the Tongmuling site and the Doulingxia site was mainly based on the distillation of zinc Sulfide Ores, which should be oxidized by a lengthy roasting processing at the lower temperature before the distilling. In order to enhance the condensation efficiency, the height of the condensers in the distillation retorts has been significantly increased. Most of the zinc products were ordered by the Minting sub-Bureau of Baonan in Changsha.
Shengwei Wang - One of the best experts on this subject based on the ideXlab platform.
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pge geochemistry and re os dating of massive Sulfide Ores from the baimazhai cu ni deposit yunnan province china
Lithos, 2008Co-Authors: Shengwei Wang, Dexin Xiong, Wenjun Qu, Andao DuAbstract:Abstract The Baimazhai deposit in Yunnan Province is one of the largest Cu–Ni Sulfide deposits hosted in mafic–ultramafic intrusions in China. Concentrations of platinum-group elements (PGE) in massive Sulfide Ores and host rocks from Baimazhai were determined by using inductively coupled plasma mass spectrometry (ICP-MS) following nickel Sulfide fire assay pre-concentration. The results show that the total PGE (ΣPGE) are quite low, decreasing gradually from central massive Ores (78.2–556 ppb) to olivine pyroxenite (0.472–67.0 ppb), gabbro (0.847 ppb) and, websterite (0.76–0.809). The intruded lamprophyre dykes also show low ΣPGE (2.98–4.07 ppb). The ΣPGE exhibit obvious positive correlations with Au, Ni and Cu contents. Primitive mantle normalized PGE patterns of the massive Cu–Ni Ores are of the Pt–Pd type with relatively steep and trough-like patterns, which are similar to those of the host rocks. In addition, the Pt/Pd and Cu/Pd ratios of the massive Sulfide Ores are similar to those of olivine pyroxenite, gabbro and websterite. These characteristics suggest that Sulfides in the massive Ores are of magmatic origin, co-genetic with their host rocks. The relatively high Pt/Pd ratios of the Baimazhai massive Sulfide Ores (averaging 0.83) and their host rocks imply that the Baimazhai Sulfides formed in a single Sulfide saturation event, but not through multiple Sulfide injections. High Ir contents (0.77–5.52 ppb, averaging 2.35 ppb) and dramatically variable Pd/Ir ratios (4.76–296, averaging 138) of the massive Sulfide Ores suggest that the Baimazhai Sulfide Ores might have suffered significant late stage hydrothermal alteration. The Baimazhai massive Sulfide Ores yield a Re–Os isochron age of 259 ± 20 Ma (MSWD = 0.025), which is the same as the major eruption stage of the Emeishan large igneous province and the Baimazhai intrusion, further supporting their magmatic origin. The initial 187Os/188Os value of 0.456 ± 0.026 indicates that crustal contamination has played an important role during mineralization. The proportion of crust-derived Os is calculated to be more than 30%.
