ZnSO4-FeSO4溶液体系高剪切强化针铁矿法除铁宏观动力学研究

Study of macro-kinetic of iron removal by goethite process enhanced by high shear on ZnSO4-FeSO4 solution system

将有机高分子乳化分散等领域常见的剪切机引入湿法冶金领域针铁矿除铁过程,以ZnSO4-FeSO4溶液体系沉铁过程为研究对象,开展高剪切强化针铁矿法除铁过程的宏观动力学研究。采用单因素试验法考察沉铁过程温度、pH、流场强化方式、剪切速率、氧气浓度对沉铁速率的影响。结果表明:温度、pH、流场强化方式、剪切速率、氧气浓度对沉铁速率影响显著。在此基础上开展的动力学研究结果表明,针铁矿法沉铁受传质过程控制,高剪切强化针铁矿法沉铁符合一级反应特征,Fe2+氧化沉铁的本征反应级数为二级,反应表观活化能约为27.85 kJ/mol。

Shear used commonly in polymer emulsification and dispersion was introduced into the process of iron removal by goethite method in the field of hydrometallurgy.In order to study the macro-kinetic of iron removal by goethite process enhanced by high shear,ZnSO4-FeSO4 solution system was taken as research object.The effects of temperature,pH,strengthening way by flow field,shear-velocity and oxygen concentration on the velocity of iron removal were investigated by single factor test method.The results show that temperature,pH,strengthening way by flow field,shear-velocity and oxygen concentration have significant effects on the velocity of iron removal.Kinetic data based on the results show that the process of iron removal by goethite method is controlled by mass transfer process,and the reaction is in line with the characteristics of first-order reaction.The reaction of iron removal by goethite method by high shear is second-order with respect to Fe2+with activation energy of 27.85 kJ/mol.