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Kinetic studies on the reduction of iron ore nuggets by devolatilization of lean-grade coal

International Journal of Minerals,Metallurgy and Materials 2016年第12期23卷 1360-1368页

作者： Chanchal Biswas Prithviraj Gupta Arnab De mahua ghosh chaudhuri Rajib Dey Department Metallurgical and Material Engineering Jadavpur University Department of Metallurgy and Materials Engineering Indian Institute of EngineeringScience & Technology School of Materials Science and Nano Technology Jadavpur University

An isothermal kinetic study of a novel technique for reducing agglomerated iron ore by volatiles released by pyrolysis of lean-grade non-coking coal was carried out at temperature from 1050 to 1200℃ for 10-120 min. The reduced samples were characterized by scanning electron microscopy, energy-dispersive X-ray spectroscopy, and chemical analysis. A good degree of metallization and reduction was achieved. Gas diffusion through the solid was identified as the reaction-rate-controlling resistance; however, during the initial period, particularly at lower temperatures, resistance to interfacial chemical reaction was also significant, though not dominant. The apparent rate constant was observed to increase marginally with decreasing size of the particles constituting the nuggets. The apparent activation energy of reduction was estimated to be in the range from 49.640 to 51.220 kJ/mol and was not observed to be affected by the particle size. The sulfur and carbon contents in the reduced samples were also determined.

关键词： iron ore reduction coal devolatilization kinetic studies

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Structural, microstructural, and thermal characterizations of a chalcopyrite concentrate from the Singhbhum shear zone, India

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International Journal of Minerals,Metallurgy and Materials 2015年第3期22卷 225-232页

作者： Ritayan Chatterjee Shamik chaudhuri Saikat Kumar Kuila Dinabandhu ghosh Department of Metallurgical and Materials Engineering Jadavpur University Division of Materials Engineering Lund University

The structural and morphological characterizations of a chalcopyrite concentrate, collected from the Indian Copper Complex, Ghatshila, India, were carried out by X-ray diffraction, scanning electron microscopy, and energy-dispersive X-ray spectroscopy. The con- centmte powder was composed mainly of free chalcopyrite and low quartz in about 3：1 weight ratio. The particle size was about 100 μm. Spectroscopic studies （FTIR, Raman, UV-visible） of the concentrate supported the XRD findings, and also revealed a marginal oxidation of the sulfide phase. The energy band gap of the sulfide was found to be 3.4 eV. Differential thermal analysis and thermogravimetry of the con- centrate showed a decomposition of chalcopyrite at 658 K with an activation energy of 208 kJ-mol 1, and two successive structural changes of silica at 848 K and 1145 K.

关键词： chalcopyrite structural properties microstructure thermal characteristics

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S-adenosyl-L-methionine, trehalose and oleanolic acid in few plants

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Health 2010年第8期2卷 968-972页

作者： Dipankar Malakar Paramita chaudhuri Trina Dutta Anil K ghosh 不详

S-Adenosyl-L-Methionine (AdoMet), S-Adenosyl- L-Homocysteine (AdoHcy), adenosine, trehalose and oleanolic acid were measured in six medicinal herbs and three spices. The findings showed that AdoMet content was forty six fold higher in the leaves of Catharanthus roseus as compared with average AdoMet content of rest of the plants. In comparison to other plants, Withania somnifera had very high AdoHcy: Ado-Met and adenosine: AdoMet ratios indicating it may have contained high AdoMet. Trehalose was found to be twenty fold and nine fold higher in bulb of Allium cepa and root of Withania somnifera respectively with respect to average trehalose content of rest of the plants. Ocimum sanctum appeared to be a rich source of oleanolic acid. It appeared from our study that Catharanthus roseus, Allium cepa and Ocimum sanctum could be utilized as natural sources of AdoMet, trehalose and oleanolic acid respectively.

关键词： AdoMet AdoHcy Adenosine Trehalose Oleanolic Acid

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Comparison between different methods of estimation of vitamin D

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Advances in Biological Chemistry 2013年第5期3卷 501-504页

作者： Mrinal Pal Subinay Datta Amit Kumar Pradhan Lekha Biswas Joydeep ghosh Partha Mondal Rajarshi Rahut Arghya Ray chaudhuri Sourav Sau Soumi Das Department of Biochemistry Burdwan Medical College Burdwan India Department of Radiotherapy Burdwan Medical College Burdwan India

Background: Vitamin D is not only important for bone health but can also affect the development of several non-bone diseases. These findings have increased the need for determining vitamin D status in a convenient and cost-effective way. In order to determine the better method for detecting vitamin D status, we have estimated blood vitamin D in three methods such as high-pressure liquid chromatography, chemiluminescent immunoassays and enzyme immunoassays. Method: Two hundred and sixteen subjects irrespective of age and sex were studied for blood vitamin D in all the three methods over a period of 2 years. Result: The statistical analysis showed that values of vitamin D obtained by chemiluminescent immunoassays (r = 0.978,

关键词： Vitamin D High-Pressure Liquid Chromatography Chemiluminescent Immunoassays Enzyme Immunoassays

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S-adenosyl-L-methionine, trehalose and oleanolic acid in few plants

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Health（健康） 2010年第8期

作者： Dipankar Malakar Paramita chaudhuri Trina Dutta Anil K ghosh

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