摘要
研究了攀枝花钛铁矿在硫酸溶液中浸取反应的动力学行为。发现在温度为１００℃～１９８℃、酸矿比为５００：１５时，铁精矿在８５％硫酸溶液中的反应速率同时受矿粒表面反应和表面产物层传质阻力影响，表观反应活化能约６８．４ ｋＪ／ｍｏｌ。浸出反应动力学方程式为 ｔ＝［０．００７６６／（２．７４×１０～７ｅ－６８４００／ＲＴ）］［１－（ｌ—ｘ）～（１／３）］｛ｌ＋（１１—０．０１６Ｔ）［ｌ＋（１—ｘ）～（１／３）－２（１—ｘ）～（２／３）］｝在酸矿比更低的非等温和准绝热实验中，该方程式可以很好地模拟反应的动力学特性。
In this paper, the digestion kinetics of Panzhihua ilmenite in sulfuric acid was investigated. In a temperature of 100℃ ~ 198℃ and an acid ilmenite ratio of 500: 15, the leaching reaction rate in 85% sulfuric acid solution is influenced by both the surface reaction of unreacted core and the diffusion through the products film. The global activation energy is 68. 4 kJ/mol and the reaction kinetic model can be written as the following equation: t= [0. 00766/ (2.74 ×10~7e-68400/RT)][l-(l-x)^(1/3)]{ 1 + (11-0.016T)[1 + (l-x)^(1/3)-2(1-x)^(2/3)]} In non-isothermal and pseudo-adiabatic experiments, the equation can well describe the experimental data.
出处
《化学反应工程与工艺》
CAS
CSCD
北大核心
2000年第4期319-325,共7页
Chemical Reaction Engineering and Technology
关键词
钛铁矿
酸解
浸出动力学
二氧化钛
颜料
digestion of ilmenite
leaching kinetics
titanium dioxide
