为揭示FeS引起油气储罐和炼油设备着火、爆炸事故的机制,以防治FeS自燃,分析活性FeS氧化发火特性,构建自燃反应表观动力学模型。首先,利用差热天平测定室温时样品放热变化及热重变化,分析样品自燃发火倾向性及化学反应机制;然后,研究氧...为揭示FeS引起油气储罐和炼油设备着火、爆炸事故的机制,以防治FeS自燃,分析活性FeS氧化发火特性,构建自燃反应表观动力学模型。首先,利用差热天平测定室温时样品放热变化及热重变化,分析样品自燃发火倾向性及化学反应机制;然后,研究氧气及空气气氛对FeS自燃反应的影响。首次通过试验证实,活性FeS在室温时即可与纯氧气或空气中的氧快速反应并释放大量热,且极易自燃;首次利用FWO法开展FeS室温下自燃反应表观动力学研究。研究结果表明:活性FeS样品在氧气中的自燃反应主要产物为Fe_2O_3,Fe_2(SO_4)_3和SO_2,表观活化能为57.101 k J/mol;在空气中的自燃反应主要产物为Fe_2O_3,S和SO_2,表观活化能为89.471 k J/mol。展开更多
A thermodynamic analysis on the acid leaching process of germanium oxide dust and discussion on the behaviors of main substances of the dust in the leaching process were carried out. The effects of temperature, acid c...A thermodynamic analysis on the acid leaching process of germanium oxide dust and discussion on the behaviors of main substances of the dust in the leaching process were carried out. The effects of temperature, acid concentration, leaching time and stirring speed on the leaching rate of germanium were investigated. Based on the characteristic of the dust, the kinetics and reactive mechanism of acid leaching were studied. The results show that the leaching of the dust by acid belonged to ＂the unreacted core shrinking model＂ of producing solid outgrowth layer. The chemical reaction was controlled by inner diffusion process. The apparent activation energy of leaching process was 12.60 kJ/mol. The leaching reaction of germanium was determined to be mainly second order reaction. The optimum conditions were the reaction temperature of 363 K, the leaching time of 2.5 h, the stirring speed of 120 r/min, the solid-to-liquid ratio of 1/8 and the acid concentration of 120 g/L. Under these conditions, the leaching rate of germanium can come up to more than 87%.展开更多
文摘为揭示FeS引起油气储罐和炼油设备着火、爆炸事故的机制,以防治FeS自燃,分析活性FeS氧化发火特性,构建自燃反应表观动力学模型。首先,利用差热天平测定室温时样品放热变化及热重变化,分析样品自燃发火倾向性及化学反应机制;然后,研究氧气及空气气氛对FeS自燃反应的影响。首次通过试验证实,活性FeS在室温时即可与纯氧气或空气中的氧快速反应并释放大量热,且极易自燃;首次利用FWO法开展FeS室温下自燃反应表观动力学研究。研究结果表明:活性FeS样品在氧气中的自燃反应主要产物为Fe_2O_3,Fe_2(SO_4)_3和SO_2,表观活化能为57.101 k J/mol;在空气中的自燃反应主要产物为Fe_2O_3,S和SO_2,表观活化能为89.471 k J/mol。
基金financially supported by the Guizhou Prov-ince Nomarch Fund for Excellence Educationists, Scientists, and Technicians (No. 2005-363)the Natural Science Fund of Guizhou Provincial Education Department of China (No. 2007-078)
文摘A thermodynamic analysis on the acid leaching process of germanium oxide dust and discussion on the behaviors of main substances of the dust in the leaching process were carried out. The effects of temperature, acid concentration, leaching time and stirring speed on the leaching rate of germanium were investigated. Based on the characteristic of the dust, the kinetics and reactive mechanism of acid leaching were studied. The results show that the leaching of the dust by acid belonged to ＂the unreacted core shrinking model＂ of producing solid outgrowth layer. The chemical reaction was controlled by inner diffusion process. The apparent activation energy of leaching process was 12.60 kJ/mol. The leaching reaction of germanium was determined to be mainly second order reaction. The optimum conditions were the reaction temperature of 363 K, the leaching time of 2.5 h, the stirring speed of 120 r/min, the solid-to-liquid ratio of 1/8 and the acid concentration of 120 g/L. Under these conditions, the leaching rate of germanium can come up to more than 87%.
