钢铁厂含铁尘泥球团自还原实验研究

Experimental Studies on Self-reduction for the Pellets Made of Iron-contained Dust and Sludge from a Steel Enterprise

以高炉工序的重力除尘灰和转炉工序的转炉污泥作为主要原料,配加一定量的还原剂、黏结剂和水制成冷固结球团,在高温下进行含铁尘泥球团自还原实验.结果表明,将重力除尘灰和转炉污泥混合制成自还原冷固结球团,不仅可弥补单种物料成球性能的不足,还可实现含铁尘泥球团的自还原,充分利用尘泥中的Fe,C和Ca O等资源;含铁尘泥球团的金属化率和脱锌率都随反应温度的升高而逐渐增大,1 300℃时,球团金属化率和脱锌率可分别达到91.35%和99.25%;随着反应时间的延长,球团的金属化率和脱锌率也逐渐增大,且在反应开始5 min内即可分别达到50.68%和75.82%;含铁尘泥球团的金属化率和脱锌率随着配碳量的增加而呈现先增大后减小的趋势,变化幅度较小.

Using gravity dust and converter sludge as the main rawmaterials,the cold bonded pellets were formed with some reducing agents,binders and water. The experiments of self-reduction for pellets in high temperature were conducted. The results showed that mixing gravity dust and converter sludge and making them into cold bonded pellets can not only make up the inadequacy of briquetting characteristic by forming with single material,but also achieve the self-reduction of pellets and fully recycle the valuable substance such as Fe,C and Ca O. Metallization and dezincification ratio of pellets all rise with the increase of reaction temperature and can reach91. 35 % and 99. 25 % respectively. As reaction time increase,metallization and dezincification ratio also rise gradually and can reach 50. 68 % and 75. 82 % respectively when the reaction lasts for 5 minutes. As carbon addition amount rise,metallization and dezincification ratio showthe trend of decrease after the first increase,but the change is very small.