改性海绵铁除氧影响因素与机理研究

Influencing Factors and Mechanism of Deoxygenization with Modified Sponge Iron

采用反应动力学分析、表面分析、扫描电镜(SEM)和X射线能谱仪(EDS)研究了诸外因对改性海绵铁除氧行为的影响及除氧相关机理。结果表明:改性海绵铁表面铜含量增加对除氧能力的促进作用大于比表面积减小使除氧能力降低的影响。改性海绵铁除氧过程为反应控制过程并符合一级反应动力学方程。另外,诸外因中溶液初始pH值和初始电导率对除氧速率常数的影响规律是先增后减。增加改性海绵铁投加量和溶液温度对除氧速率常数的提高具有促进作用,但继续增加改性海绵铁的投加量并不能无限提高除氧速率常数,速率常数存在极限值为0.3663min-1。

Kinetics, mechanism and the SEM, EDS and surface analyses were applied to evaluate the deoxygenization effects of factors on the deoxygenization behaviors. The results show that the cop- per content on the modified sponge iron has more effects than the specific area of modified sponge iron on deoxygenization performance. The deoxygenization by modified sponge iron is described as a first order reaction and is reaction controlled. In addition, the reaction rate constant decrease following an increase with initial pH value or initial conductivity increasing. The increase in modified sponge iron dosage or solution temperature can improve the reaction rate constant. However, the reaction rate constant is unable to be infinite for the increase in modified sponge iron dosage, and the limiting value of rate constant is 0. 3663min-1.