钢铁厂铁鳞硫酸的浸出过程

来源期刊:中南大学学报(自然科学版)2009年第4期

论文作者:彭长宏 胡振光 戴 劲 傅 锋

文章页码:874 - 878

关键词:铁鳞;硫酸浸出;动力学

Key words:millscale; sulfuric acid leaching; kinetics

摘    要:为制备高纯氧化铁,以钢铁厂铁鳞为原料,考察液固比、温度、时间和硫酸用量对铁浸出率的影响。研究确定硫酸浸出过程的工艺条件,分析浸出过程的动力学机理。确定硫酸浸出铁鳞的最佳工艺条件为:液固比3:1,温度100 ℃,时间6.0 h,硫酸用量为理论量的1.25倍。在此优化工艺条件下,铁鳞中Fe的平均浸出率为91.69%。动力学研究结果表明,铁鳞的硫酸浸出过程在动力学上属收缩核模型,即满足1/2(1-at)-2/3-1/2=Kt,受化学反应的控制,反应活化能为70.40 kJ/mol。

Abstract: For preparation of high-purity iron oxide, a study on the leaching of millscale from steel plant and the effects of the liquid-solid ratio, the reaction temperature, the leaching time and the sulfuric acid excessive times was investigated. The best technical conditions of the leaching process were ascertained, and the kinetics of leaching was studied. The results show that when liquid-solid ratio is 3:1, the sulfuric acid excess is 1.25 times, reaction temperature is 100 ℃ and the leaching time is 6.0 h, the average leaching rate of Fe in the three comprehensive experiments is 91.69%. The leaching process is controlled by chemical reaction and can be described by the shrinking core model with activation energy of 70.40 kJ/mol.

基金信息:国家高技术发展研究计划(863)项目
广东省-教育部产学研专项基金资助项目
中国博士后科学基金资助项目
广东省科技计划项目

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