钒离子指示电极在石煤焙烧料浸出动力学研究中的应用  

Application of vanadium ion indicator electrode in leaching kinetics study of roasted stone coal

作　　者：李元高[1,2] 曾孟祥[1] 张平民[1] 

机构地区：[1]中南大学化学化工学院,湖南长沙410083 [2]厦门理工学院环境工程系,福建厦门361005

出　　处：《中南大学学报（自然科学版）》2009年第3期620-625,共6页Journal of Central South University:Science and Technology

基　　金：湖南省科技计划项目(S2006G323)

摘　　要：以湘西吉首某地石煤矿为原料,在850℃焙烧6h后,采用酸浸法从焙烧料提取钒,用钒离子指示电极在线跟踪石煤浸出过程中五价钒浓度的变化,研究浸出过程中的动力学;考察矿石粒径、pH值和浸出温度对浸出过程E—t曲线的影响。研究结果表明:钒离子指示电极电势测定结果受杂质Fe3+的影响很小,可以用于跟踪石煤焙烧料浸出过程中钒离子浓度的变化;硫酸浸出后,矿石粒度越小,溶液的酸度越大,浸出温度越高,五价钒离子越容易浸出。采用等高线法求算出石煤焙烧料浸出过程在高温段区的表观活化能Ea为1.56kJ/mol,受扩散步骤控制;在低温段区的表观活化能Ea为3.99kJ/mol,受化学反应步骤控制。After 6 h baking of stone coal from Jishou at 850℃, vanadium ion indicator electrode was applied in extraction of vanadium from the roasted stone coal by acid leaching to monitor the concentration of V（V） on-line for dynamics investigation. The influence of mineral size, pH and the temperature of leaching on the electrode potential-- time curves was investigated. The results show that the potential mensurated by the indicator electrode is little influenced by the impurity cation Fe3＋, so vanadium ion indicator electrode can be used to monitor the concentration of V（V） on-line in the process of mineral leaching. After acid leaching, the smaller the mineral size, the stronger the acidity and the higher the temperature, the easier the leaching will be. In the phase at high temperatures, the activation energy calculated by contour method is 1.56 kJ/mol, the leaching process is controlled by the diffuseness of reacting reagents. And in the phase at low temperatures, the activation energy is 3.99 kJ/mol, the leaching process is controlled by the chemical reaction.

关 键 词：石煤 钒 酸浸 钒离子指示电极 

分 类 号：O657.15[理学—分析化学]