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温度及气氛对半焦直接还原铁矿石的影响 预览

Influence of temperature and atmosphere on iron ore direct reduction by char
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摘要 利用热重分析(TGA)和实验装置进行了半焦直接还原铁矿石试验,对比了不同还原温度和气氛下还原产品的性质。由TGA,焦矿质量比为1∶1的半焦铁矿石混合物由室温加热至1100℃,N2,H2和CO气氛下还原过程可分为3个阶段,其中N2下3个阶段活化能随温度逐渐增加,而H2和CO下则先增加后降低。由固定床还原产物分析结果,温度和气氛对半焦直接还原铁反应过程及反应程度均有一定影响。3种气氛下,900℃后产物中主要为金属Fe,但引入还原性气体H2,CO可有利于低温下铁矿石的还原。N2气氛下反应至900℃后半焦可对铁矿石进行还原,但得到的海绵铁金属化率低于90%,无法满足直接炼钢要求,可通入H2、CO等活性气氛,提高还原产品的品质。 Experiments on iron ore direct reduction by char were carried out using thermogravimetric analysis (TGA) and laboratory test equipment. The properties of the reduced products at different reduction temperatures and atmospheres were compared. TGA shows that the reduction process of 1∶1 char-ore mixture can be divided into three stages from room temperature to 1 100 ℃. The activation energy of three stages increases with temperature in N 2 atmosphere, but increases first and then decreases in H 2 and CO atmosphere. According to analysis results of the products from fixed-bed direct reduction, the reaction temperature and atmosphere have certain influences on the reaction process and degrees of reduction reactions. Under the three atmospheres, the metallic is the main types of iron in the product after 900 ℃, however, the introduction of reducing gases such as H 2 and CO will benefit to the reduction at lower temperature. Iron ore can be reduced by char after 900 ℃ in N 2 atmosphere, but the metallization rate of direct reduction iron is <90%(mass fraction), unsatisfying the requirements of direct steelmaking. Active atmosphere such as H 2 and CO can help to improve the quality of reduction products.
作者 樊英杰 张延辉 聂凡 何德民 李学强 尚建选 张秋民 FAN Ying-jie;ZHANG Yan-hui;NIE Fan;HE De-min;LI Xue-qiang;SHANG Jian-xuan;ZHANG Qiu-min(School of Chemical Engineering and Technology, Xi′an Jiaotong University, Xi′an 710049, Shaanxi Province, China;Shaanxi Coal and Chemical Industry Group Co., Ltd., Xi′an 710065, Shaanxi Province, China;Shaanxi Coal and Chemical Technology Institute Co., Ltd., Xi′an 710065,Shaanxi Province, China;School of Chemical Engineering;Sate Key Laboratory of Fine Chemicals, Dalian University of Technology,Dalian 116024,Liaoning Province, China)
出处 《化学工程》 CAS CSCD 北大核心 2019年第7期47-51,57共6页 Chemical Engineering
基金 国家重点研发计划支持项目(2016YFB0600400).
关键词 半焦 铁矿石 直接还原铁 char iron ore direct reduction iron
作者简介 樊英杰(1982—),男,高级工程师,从事煤炭分质清洁转化利用技术研究,电话:(029)81772088,E-mail:fanyingjie@aliyun.com;通信联系人:张秋民(1963-),男,教授,电话:(0411)84986150,E-mail:zhangqm@dlut.edu.cn。
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