CO还原气氛下铁酸锌选择性分解过程研究  

Selective Decomposition Process of Zinc Ferrite in CO Reducing Atmosphere

作　　者：许继芳 杨莹 郭恒睿 汪鑫 邓寅祥 XU Ji-fang;YANG Ying;GUO Heng-rui;WANG Xin;DENG Yin-xiang(Shagang School of Iron and Steel, Soochow University, Suzhou 215021, Jiangsu, China)

机构地区：[1]苏州大学沙钢钢铁学院,江苏苏州215021

出　　处：《矿冶工程》2019年第1期86-90,共5页Mining and Metallurgical Engineering

基　　金：国家自然科学基金(51704201);苏州大学青年教师自然科学基金(SDY2015A07);江苏省高等学校大学生创新创业训练计划(校企合作基金项目);秦惠莙与李政道中国大学生见习进修基金

摘　　要：为将电炉粉尘中铁酸锌选择性分解为Fe_3O_4和ZnO,采用热力学软件分析了铁酸锌在CO气氛下还原分解的热力学过程和分解特征,讨论了反应温度和气体组成对铁酸锌分解行为的影响。结果表明:铁酸锌的气体还原遵循逐级还原规律,很容易被CO还原为Fe_3O_4和ZnO,也易过还原为FeO和Fe,甚至可将ZnO还原为锌蒸气;控制P_(CO)/(P_(CO)+P_(CO_2))在0.05～0.20之间,温度在600～700℃范围内,可实现铁酸锌的高效分解、抑制铁氧化物的过还原;对CO还原气氛下铁酸锌分解过程进行了热力学模拟,计算出铁酸锌还原初期时的CO利用率约为35%。In order to selectively decompose zinc ferrite in electric furnace dust into Fe3O4 and ZnO, the thermodynamic process and decomposition characteristics of zinc ferrite in CO reducing atmosphere were analyzed with a thermodynamic software, and effects of reaction temperature and gas compositions on the decomposition behavior of zinc ferrite were discussed. The results showed that the reduction of zinc ferrite followed a stepwise process. Zinc ferrite was prone to being reduced to Fe3O4 and ZnO, or over.reduced to FeO and Fe. And ZnO could even be reduced to zinc vapor. With PCO /(PCO+PCO2) controlled within 0.05~0.20 and temperature within the range of 600 ~700 ℃, zinc ferrite could be decomposed efficiently and the over.reduction of iron could be suppressed. Based on the thermodynamics simulation of the decomposition of zinc ferrite in CO reducing atmosphere, the CO utilization rate in the initial period of zinc ferrite reduction was calculated to be around 35%.

关 键 词：电炉粉尘 铁酸锌 还原反应 分解行为 四氧化三铁 氧化锌 

分 类 号：TF123[冶金工程—粉末冶金]