铁酸锌的酸浸动力学及含铁酸锌废料浸出研究

Study on Kinetics of Acid Leaching of Zinc Ferrite and Leaching of Zinc Ferrite Waste Material

摘要: 为确定铁酸锌浸出过程中的最优控制参数，高效浸出含铁酸锌物料中的锌和铁，以制备的铁酸锌为原料，硫酸作浸取剂，考察了浸出温度、硫酸初始浓度对锌浸出效果的影响，得到了浸出反应动力学方程式。结果表明，在温度为50℃~90℃，硫酸与铁酸锌初始物质的量之比为6时，浸出过程符合减缩核动力学模型，表观反应活化能为63.50 kJ/mol，浸出反应受表面化学反应步骤控制。以含铁酸锌废料为原料，考察了浸出条件对锌、铁浸出率的影响。在硫酸与锌和铁物质的量之比为1.2:1，浸出温度为95℃，矿物粒径为0.048 mm，浸出时间为4 h的条件下，含铁酸锌废料中锌、铁浸出率分别为90.52%、90.14%。

Abstract: In order to determine the optimal control parameters for leaching zinc ferrite and efficiently extract zinc and iron from zinc ferrite materials, the effects of temperature and sulfuric acid initial concentration on the kinetics of leaching reaction were investigated with prepared zinc ferrite as raw material and sulfuric acid as leaching agent. The macroscopic reaction kinetic equation was obtained. The results show that the leaching kinetics of zinc is suitable for the reduction of nuclear kinetics model under the condition that temperature is from 50˚C to 90˚C and sulfuric acid and zinc ferrite initial molar ratio is 6. The apparent activation energy is calculated to be 63.50 kJ/mol. The leaching reaction process is controlled by surface chemical reaction steps. With zinc ferrite waste material as the research object, effects of leaching conditions on the leaching rate of zinc and iron were investigated. The leaching rate of zinc and iron from zinc ferrite waste are 90.52% and 90.14% under the condition of sulfuric acid to zinc and iron molar ratio of 1.2:1, leaching temperature of 95˚C, mineral particle size of 0.048 mm, leaching time of 4 h.