CO还原氧化锌速率的研究

来源期刊：中南大学学报(自然科学版)2001年第2期

论文作者：彭兵 张传福 彭及

文章页码：189 - 191

关键词：化学动力学;氧化锌;还原

Key words：chemical kinetics; zinc oxide; reduction process

摘    要：电弧炉粉尘直接还原回收新工艺中,粉尘中的锌被还原挥发进入气相并于收尘系统中被氧化,分离出这部分含锌较高的物料可采用传统的方法回收锌.而含锌物料中ZnO成分不断变化.为探索其还原过程的规律,首先采用化学纯ZnO进行CO还原实验,研究还原过程的有关规律,这一还原反应也是其它冶金过程中常见的和十分重要的反应.经实验研究发现,氧化锌还原速率与CO的浓度和温度有关,在还原温度为910~1 200℃,CO浓度控制在15%~100%(体积分数)范围的实验条件下,建立了还原过程的动力学方程,确定了条件恒温下还原过程的动力学参数表观活化能为251.57 kJ/mol,并与CO和CO₂的浓度以及反应产物锌蒸汽无关,CO还原氧化锌的过程为化学反应所控制,还原反应速度主要取决于还原温度,随着温度的升高,反应显著加快.

Abstract: In the new process of direct recycling electric arc furnace (EAF) dust, the ZnO in the dustwas reduced andevaporated, then oxidized in the system. The ZnO can be reduced and recovered in the traditionalway after the materials of high ZnO content are separated and collected. But the zinc content in the materials changed from time to time in the recycling process. The experiments were carried out chemically pure ZnO and reducing agent CO to study the reduction mechanismof the process. And this reduction is important in other metallurgical processes. The reduction rate of ZnO with CO as reducing agent depends on the temperature and CO concentration. The kinetics study of the reduction process is conducted in the temperature range of 910~1 200℃, when the CO concentration constant values are between 15% and 100%. The kinetics equation was set up and the Arrhenius activation energy value was determined as 251.57 kJ/mol. The reaction of ZnO with CO is chemically controlled. The reaction ratewould increase athightemperature, and was mainly controlled by the temperature condition.