含锌高炉瓦斯泥浸出过程动力学研究

为研究高炉瓦斯泥硫酸浸出锌过程的动力学,以河北某高炉瓦斯泥为原料进行了硫酸浸出试验,分别考察了浸出温度、硫酸浓度对浸出过程锌浸出率的影响。随着浸出温度的升高和硫酸浓度的增加,锌浸出率逐渐提高,浸出速率降低。采用Avrami动力学模型对锌浸出过程进行模拟,结果表明,浸出过程符合n=0.160 4的Avrami动力学模型,反应表观活化能为10.02 k J/mol,说明浸出过程受扩散控制,因此要提高浸出效率,应加强扩散效应。提高硫酸浓度或升高反应温度,加速了溶液中的反应过程和传质过程,锌浸出率提高。试验结果为湿法浸出过程动力学以及固废资源化利用后续研究和生产实践提供了一定的理论依据。

Kinetics Research of Sulfuric Acid Leaching from Blast Furnace Flue Dust Containing Zinc

In order to investigate the leaching kinetics of sulfuric acid leaching zinc from blast furnace flue dust,sulfuric acid leaching test was carried out on a blast furnace flue dust from Hebei.Effects of leaching temperature and sulfuric acid concentration on the leaching rate of zinc were investigated.With the leaching temperature increased and sulfuric acid concentration increased,zinc leaching rate gradually increased,and leaching rate decreased.By using Avrami dynamic model,simulation results of zinc leaching process show that when n was 0.160 4,flue dust acid leaching process was in accordance with Avrami dynamic model,the apparent activation energy was 10.02 kJ/mol,thus the process was controlled by diffusion.To improve leaching efficiency,diffusion effect should be reinforced.Increase sulfuric acid concentration or rise reaction temperature can accelerate the reaction process and mass transfer process in the solution,zinc leaching rate increased.The experimental results provide a theoretical basis for wet leaching kinetics and the followed research and production practice of solid waste resource recycle and reuse.