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Ai G.,Jiangxi University of Science and Technology | Ai G.,China University of Mining and Technology | Tao X.,China University of Mining and Technology | Wang Y.,Supervision Center for Geological and Mineral Products | Chen Y.,Institute of Geological Survey
2011 International Conference on Electric Technology and Civil Engineering, ICETCE 2011 - Proceedings

The mineral processing wastewater of sulfide ore is easily cause environment pollution, because it contains xanthate. This thesis applied the combined technology of ultrasound and Fenton reagent to deal with the artificial and actual mineral processing wastewater, in terms of the effects of pH value, H2O2 and Fe2+ concentration on the removal efficiency of xanthate. The results showed that combined ultrasound with Fenton reagent has the synergistic effect, the removal efficiency is better than use ultrasound and Fenton reagent singly. For dealing with the xanthate simulated wastewater, which concentration is 120 mgL1, on the condition of concentration of H2O2 is 20 mgL1, concentration of Fe2+ is 12 mgL1, initial pH of wastewater is 4, the removal of xanthate rate attains up to 96.8%; and for dealing with the actual mineral processing wastewater, on the condition of pH is 3, concentration of H2O2 is 24 mgL1, concentration of Fe 2+ is 18 mgL1, the removal of xanthate rate attains up to 97.6%, which meet the standard for discharge of xanthate wastewater. At last, this thesis discussed the mechanism of the xanthate was degraded by combined technology of ultrasound and Fenton reagent. © 2011 IEEE. Source

Wang B.,Chengdu Institute of Geology and Mineral Resources | Wang B.,CAS Guangzhou Institute of Geochemistry | Chen L.,Wuhan University | Xu J.,CAS Guangzhou Institute of Geochemistry | And 3 more authors.
Acta Petrologica Sinica

It is generally accepted that the post-collisional potassic and ultrapotassic magmatism are erupted from western to eastern in temporal in Lhasa block of Tibetan Plateau. However, this study has identified the potassic volcanic rocks from the Maqiang area in central of Lhasa block, which formed at ∼ 21. 3 Ma by 40Ar-39Ar dating. These potassic rocks are geochemical similar to ultrapotassic rocks, e. g., high in MgO (> 3%) and K2O/Na2O (K2O/Na2O > 2). The high MgO contents of potassic rocks in studying area caused for late-altered dolomite and they are more similar to potassic volcanic rocks although they show some "ultrapotassic" characteristics. Geochemically and tectonically, these potassic rocks in studying area are similar to the potassic-ultrapotassic rocks occurring along N-S rifts in the western Lhasa block. The enrichment in light rare earth elements (LREE), large ion lithophile elements (LILE, e. g., Rb, Ba and Th) and depletion in HFSE (e. g., Nb, Ta and Ti), and high initial 87Sr/86Sr and low εNd(t) values of the potassic rocks in studying area, indicated that they were probably generated by partial melting of a metasomatic enrichment mantle related to early subduction events. Recognition of the potassic rocks in the Maqiang area imply that post-collisional potassic-ultrapotassic magmtism did not migrate from west to east in the Lhasa block. In other words, the post-collisional potassic and ultrapotassic lava in the Lhasa block were might erupted at the same time. And we suggest that the formation of the Miocene potassic-ultrapotassic volcanic rocks and N-S rifts in the Lhasa block were probably triggered by slab break-off of the India continent lithosphere during northern intra-continent subduction in early Miocene. Source

Ai G.-H.,Jiangxi University of Science and Technology | Ai G.-H.,China University of Mining and Technology | Liu Y.-F.,Jiangxi University of Science and Technology | Wang Y.,Hefei Testing and Quality Supervision Center for Geological and Mineral Products | Chen Y.,Institute of Geological Survey
Journal of Residuals Science and Technology

Heavy metals are a component of sulfide ore tailings, which may pose serious threats to environment and human health. This study focuses on physical and chemical properties of main mineral composition in a sulfide ore tailings impoundment and discusses a series of chemical reaction equations of the main minerals in tailings including FeS, Fe1-xS and Fe7S8. This study aims to examine migration rules of the heavy metal elements in the tailings. To further investigate the migration mechanism, experimental simulation was used to provide some bases for the release and migration law of heavy metals in tailings. © 2015 DEStech Publications, Inc. Source

Ai G.,Jiangxi University of Science and Technology | Ai G.,China University of Mining and Technology | Tao X.,China University of Mining and Technology | Wang Y.,Hefei Testing and Quality Supervision Center for Geological and Mineral Products | Chen Y.,Institute of Geological Survey
Asia-Pacific Power and Energy Engineering Conference, APPEEC

In order to find out the distribution of ploycyclic aromatic hydrocarbons of aerosol (PM 10, PM 2.5) and standardize the system of beneficiation reagent and provide basis for monitoring air, five sampling areas were set up from June,2008 to October,2008, in the period.The researchers collected samples of (PM 10, PM 2.5) and pretreated them by the methods such as soxhelt extraction,concentrated by Kuderna-Danish concentrator and blowing high purity nitrogen in sequence. In addition, Gas chromatography and mass spectrometry(GC-MS) is used to ascertain Ploycyclic Aromatic Hydrocarbons of the pretreated samples in this paper. The results show that our analysis establishes some important results as follows: A total of thirty-five (PM 10, PM 2.5) samples were detected respectively and 16 kids of typical PAHs can are inspected in every samples,Levels of benzo[a] pyrene are in the range from 1.03 ng/m 3 to 23.35ng/m 3 (PM 10) and 0.24ng/m 3 to 18.75ng/m 3 ( PM 2.5),with an overall mean of 5.07 ( PM 10) and 3.91 ( PM 2.5). Indicate the serious pollution of ploycyclic aromatic hydrocarbons in the mineral separation plant,be harmful to health of workers and should be attached importance by corrective department. © 2011 IEEE. Source

Zhong Y.,Wuhan University | Ma C.,Wuhan University | Liu L.,Bureau of Mineral Resources | Zhao J.,Wuhan University | And 3 more authors.

Palaeozoic mafic igneous rocks are potentially significant in constraining the tectonic nature and evolution of the Kwangsian Orogeny in the eastern South China Block, yet they have received little attention because of their limited outcrop. Geochemistry and geochronology was carried out on newly identified Ordovician ultramafic-mafic appinites in the Wugongshan Domain of the Cathaysia Block. Seven appinite samples yielded 206Pb/238U crystallisation ages ranging from 452±4Ma to 473±3Ma. Abundant 480-500Ma zircon xenocrysts and/or inherited zircons were found in the appinites, possibly indicating an earlier magmatism episode in the early Palaeozoic period. The Wugongshan appinites are ultramafic to mafic in composition, and the ultramafic rocks display features of cumulates (high concentrations of MgO, Fe2O3t, Cr, Ni, and low concentrations of total alkali and total rare earth elements [REE]). The appinite geochemistry displays: relatively flat chondrite normalised REE patterns with slight enrichment in light REE and weak negative Eu anomalies; enrichment in large-ion lithophile elements (such as Rb, K), and weak depletion in Nb-Ta in primitive mantle normalised trace element patterns. We suggest that the Wugongshan appinites likely originated from an ancient metasomatised mantle, and that crustal assimilation, fractional crystallisation (AFC), magma mingling and hydration were involved in the petrogenetic process, based on the combination of geochemistry, crust-like bulk Sr, Nd and zircon Hf isotopic compositions (εNd (t)=-8.2 to -3.2, initial 87Sr/86Sr ratios of 0.7067-0.7144, zircon εHf (t) values peaking at -9 to -3) and regional geological data. Further considering the alignment and chronology of the appinites, we suggest that the appinitic magmas probably were emplaced along the Jiangshan-Shaoxing Fault in a local extensional zone in an intracontinental regime in the early Palaeozoic. © 2014 Elsevier B.V. Source

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