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Yuan B.,China University of Geosciences | Mao J.W.,Chinese Academy of Geological Sciences | Yan X.H.,Jinduicheng Molybdenum Group Co. | Wu Y.,Yangtze University | And 2 more authors.
Acta Petrologica Sinica | Year: 2014

The Daliangzi Pb-Zn deposit located on the southwestern margin of the Yangtze Craton, with reserve of 1.80Mt and averaging grade of 11.45% (lead + zinc), is one of the famous high-grade Pb-Zn ore fields in the Sichuan-Yunnan-Guizhou metallogenic belt. Geochemistry of Sr, C, H, O, S isotope and trace element in sphalerite is discussed in this paper in an effort to understand the sources of the ore metals and ore-fluids which cause many different opinions in understanding the genesis of the deposit. The results show that the Ge/In and Ga/In of sphalerites with As, Sb and Ag enriched are much bigger than 100 which indicate the metallogenic environment is of mid-low temperature. The origin of a mix of meteoric and metamorphic (formation) water can be inferred after the datum that the δ18 OH2O values range from -6.02‰ ∼ 3.31‰ and the δD values range from -74.6‰ ∼ -40.3‰ of the ore-fluids. δ13 CV-PDB and δ18 OV-SMOW values of the hydrothermal gangue minerals calcite and dolomite are -3.5‰ ∼ + 1.4‰ and +11.6 ∼ + 18.1‰, indicating that the CO2 in the ore-forming fluid was derived from the dissolution of Sinian carbonates and was greatly affected by the meteoric water and organic carbon in the ore bearing rock. The most of δ34 S values of sulfides are 10‰ ∼ 20‰, and the δ34 S values of sulfates are 20.2‰ ∼ 38.1‰, suggesting that the sulfur should be derived from the in-situ thermochemical reduction of sulfates from the sedimentary strata. The initial 87Sr/86 Sr values of the ore-forming fluid are 0.707137 ∼ 0.714588 with the mean value of 0.711951 which are higher than 87Sr/86 Sr values (0.70834 ∼ 0.70861) of the host rock Sinian dolomite and lower than 87Sr/ 86 Sr values (0.7249 ∼ 0.7288) of the basement and some part of the Sinian formation which had high 87Sr/86 Sr values, implying that the ore-forming fluid probably migrated through the basement and the Sinian formation and experienced water-rock reaction and isotope exchange among the ore fluid, the basement and Sinian formation. Source

Yan X.-H.,Jinduicheng Molybdenum Group Co. | Meng D.-M.,Changan University | Wang R.-T.,Changan University | Wang R.-T.,Geol Explor Institute Of North West Mining And Geological Exploration Bureau For Nonferrous Metals | Tan Y.,No. 712 Team of Northwest Mining and Geological Exploration Bureau for Nonferrous Metals
Northwestern Geology | Year: 2013

Molybdenite is abundant in China and it distributed extensively in every province. The type and elements combination of Mo deposits are diverse. Based on extensive data collection and field investigation, this paper summarized the characteristics of molybdenum ore resources in China and divided Mo deposits in China into 4 groups, 12 classes, 19 ore deposit-types in comprehensive consideration of ore deposit genesis, occurrence condition and ore-controlling factors, ore components, tectonic structure etc. And further we concluded ore body occurrence condition, hydrothermal alteration and mineralization assemblages of every type of Mo deposits. According to the analysis of tectonic, magma, etc, the prospecting potential of molybdenum in China is great. We analyzed porphyry Mo deposits' geological formation background of the continental orogenic environment in China and summarized various metallogenic characteristics of magmatic type Mo deposits. Through analysis on tectonic background, tectonic magmatic fluid events and element combination, we point out the arrangement of study and exploration; the first is magmatic-type Mo deposit and the second is fluid-type Mo deposit. The forecast of east Qinling, Yanliao and Tethys Mo metallogenic area demonstrates the focus of future prospecting work in those regions, which has important guiding significance in geological prospecting and studies on Mo deposits in China. Source

Zhang M.,Jinduicheng Molybdenum Group Co. | Li X.-L.,Tianjin Institute of Geology and Mineral Resources
Yejin Fenxi/Metallurgical Analysis | Year: 2016

The content of molybdenum ore was analyzed by energy dispersion X-ray fluorescence spectrometry. Thus, a rapid determination method of six components (Mo, Pb, Cu, Fe, S and K) in tailings, raw ore and rough concentrate of molybdenum ores in beneficiation process was established. Since there was few certified reference material of molybdenum ore, several actual samples with certain content gradients, which were selected from different stages of beneficiation process and then determined by wet method, were used as calibration samples to prepare the calibration curves. Meanwhile, the influence among elements was corrected by the empirical coefficient method and scattering line internal standard method. As a result, the interference of matrix effect and spectral overlapping could be reduced. The correlation coefficients of calibration curves were between 0.999 3 and 1.000 0. The detection limits of elements were between 3 μg/g and 10 μg/g. The precision test of molybdenum ore samples was conducted. It was found that the relative standard deviations (RSD, n=9) of determination results were between 0.22% and 3.7%. The determination accuracy of molybdenum ore samples was also investigated. The results were consistent with those obtained by the wet method. © 2016, CISRI Boyuan Publishing Co., Ltd. All right reserved. Source

Xu C.-J.,Xian University of Science and Technology | Zhang J.-X.,Xian University of Science and Technology | Zhang J.-X.,Jinduicheng Molybdenum Group Co. | Tian J.,Xian University of Science and Technology | And 2 more authors.
Cailiao Rechuli Xuebao/Transactions of Materials and Heat Treatment | Year: 2015

Zn-enriched surface coating was prepared on pure magnesium through zinc atom diffusing at 430℃ under the atmospheric. The effect of diffusion time on the thickness, microstructure and properties of the coating was investigated. The results show that the uniform and continuous coating can be formed on pure magnesium surface; the coating consists of Zn, α-Mg, Mg0.97Zn0.03 and Mg7Zn3 intermetallic compounds. The thickness and hardness of the coating surface increase with the treatment time increasing. The thickness of zinc coating increases with the diffusion time extension, and the coating surface hardness also increases. The highest value of hardness can reach 168 HV0.01 when the diffusion time is 16 h due to the content of intermetallic compounds in the coating. At the same time, the coating with diffusing 8 to 16 h exhibits excellent corrosion resistance in 3.5% NaCl solution, the pure magnesium substrate can be protected by the coating. ©, 2015, Editorial Office of Transactions of Materials and Heat Treatment. All right reserved. Source

Wang S.,Xian University of Architecture and Technology | Sun Y.,Jinduicheng Molybdenum Group Co.
2011 International Conference on Information Science and Technology, ICIST 2011 | Year: 2011

A microwave drying system with the ability of automatic temperature and power control was developed for molybdenum drying. The samples' mass and the moisture content could be obtained online. Four different drying modes were attempted with different combination of temperature and power controls. Feedback temperature control with predefined variable power profiles resulted in the best temperature control and product quality. All other modes proved their own pros and cons. The study also verified that it was difficult to maintain a constant temperature during microwave drying process when a feedback temperature control was not included. The results can be used to determine microwave power levels in microwave drying practices both with and without temperature control. © 2011 IEEE. Source

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