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reduced to Nb in molten salt, experiencing some intermediate products of calcium niobates and niobium suboxides. Nb metal obtained was converted to NbC with assistance of carbon. The reduction of Nb oxides... reduction; molten chloride; calcium niobates; acid leaching 1 Introduction Niobium carbide (NbC) is a non-oxide ceramic material primarily used as the starting material for the commercial production......
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Article ID: 1003-6326(2005)05-1145-05 Behavior of calcium silicate hydrate in aluminate solution LI Xiao-bin(李小斌), ZHAO Zhuo(赵 卓), LIU Gui-hua(刘桂华), ZHOU Qiu-sheng(周秋生), PENG Zhi-hong(彭志宏) (School of Metallurgical Science and Engineering, Central South University, Changsha 410083, China) Abstract: Using calcium hydroxide and sodium silicate as starting materials, two kinds of calcium......
Calcium ferrite formation characteristic during iron ore sintering with different oxygen atmospheresMAO Xiao-ming(毛晓明), YOU Zhi-xiong(游志雄), ZHANG Yuan-bo(张元波), FAN Zhen-yu(范振宇), LI Guang-hui(李光辉), JIANG Tao(姜涛) (School of Minerals Processing & Bioengineering, Central South University, Changsha 410083, China)Abstract:It is generally known that the large formation amount of calcium ferrite......
J. Cent. South Univ. Technol. (2011) 18: 1063-1067 DOI: 10.1007/s11771-011-0804-5 Hydrogen permeability of slags containing calcium fluoride DONG Yan-wu(董艳伍)1, 2, JIANG Zhou-hua(姜周华)1, LIANG Lian... South University Press and Springer-Verlag Berlin Heidelberg 2011 Abstract: To investigate the hydrogen permeability of calcium fluoride used for electroslag remelting (ESR) process, "Gas-slag- metal......
Synthesis and reaction behavior of calcium silicate hydrate in basic system LIU Gui-hua(刘桂华), HE Qiang(贺 强), LI Xiao-bin(李小斌), PENG Zhi-hong(彭志宏), ZHOU Qiu-sheng(周秋生) (School of Metallurgical Science and Engineering, Central South University, Changsha 410083, China) Abstract: At the molar ratio of CaO to SiO2 of 1, with calcium hydroxide and sodium silicate, calcium silicate hydrate......
J. Cent. South Univ. (2018) 25: 2349-2359 DOI: https://doi.org/10.1007/s11771-018-3919-0 Safe utilization of chromium-bearing vanadate residue by recovery of vanadium and chromium based on calcium... solution. Results indicate that the stability of calcium vanadate and calcium chromate depends on pH and [HCO3-]. CaV2O6·4H2O transforms into CaV2O6·4H2O, CaV2O6·2H2O, CaV2O6, Ca2V2O7·2H2O, and Ca5(VO4)3(OH......
螺线管磁定位技术初探陈剑垚1,岳刚21. 中国地质科学院勘探技术研究所2. 东北煤田地质局一五五勘探队摘 要:随着钻探工艺的不断发展,对井身轨迹的要求不断增加.一般依靠地磁定位的仪器已无法满足精度要求,于是研发出了多种近场磁导向系统,如MGT,RMRS和慧磁中靶仪等.以发射源种类为依据,可分为主动测量技术和被动测量技术.螺线管磁定位系统属于主动测量技术,它具有数据传输量小,耐温高等优点.目前国外已经商用化,而国内研究不多.本文简单介绍了螺线管测量的理论模型,着重阐述了室内实验和误差分析.实验共测量了144个......
J. Cent. South Univ. Technol. (2009) 16: 0558-0562 DOI: 10.1007/s11771-009-0093-4 Alkaline treatment kinetics of calcium phosphate by piezoelectric quartz crystal impedance ZENG Li-ping(曾丽萍)1...; Abstract: Calcium phosphate film was prepared by electrochemical deposition technology. Subsequently, the alkaline treatment process of calcium......
J. Cent. South Univ. (2012) 19: 1802-1807 DOI: 10.1007/s11771-012-1211-2 Crystallization of calcium carbonate in hydrogels in presence of meso-tetrakis (4-hydroxylphenyl) porphyrin ZHANG Feng-ju(张凤菊... an important role in biomineralization process. In order to explore the effect of both meso-tetrakis (4-hydroxylphenyl) porphyrin (THPP) and hydrogels on calcium carbonate mineralization, and consequently......