Effects of MgO Containing Additive on Low-Temperature Metallurgical Properties of Oxidized Pellet  

作　　者：GAO Qiang-jian SHEN Feng-man WEI Guo JIANG Xin ZHENG Hai-yan 

机构地区：[1]School of Materials and Metallurgy, Northeastern University

出　　处：《Journal of Iron and Steel Research International》2013年第7期25-28,共4页

基　　金：Item Sponsored by National Natural Science Foundation of China ( 51074206 , 51074040 )

摘　　要：As a main charging form of BF （blast furnace）, pellets play an important role in blast furnace process. However, comparing with sinters, pellets have many disadvantages, such as reduction swelling, low softening and melting temperature and so on. Therefore, the flux pellets have been applied in blast furnace widely, especially MgO containing pellets. The light burned magnesite is applied as MgO containing additive in pellet production. The char- acters of light burned magnesite are explored. Meanwhile, the effects of it on low-temperature metallurgical proper-ties are investigated such as low-temperature reduction degradation index （RDI）, compressive strength （CS） and the reduction swelling index （RSI）. The light burned magnesite calcined at 850 ℃ manifests better grindability, larger specific surface area, and higher hydration activity. It is found that the addition of light burned magnesite can im- prove low-temperature metallurgical properties （RDI, RSI） of the pellets. With the increase of light burned magne-site in pellets, the RSI and RDI decrease gradually; when the proportion of light burned magnesite does not exceed 2.0% in pellets, the CS decreases slightly, but it still surnasses 2689 N. which can still meet the demand of BF.As a main charging form of BF （blast furnace）, pellets play an important role in blast furnace process. However, comparing with sinters, pellets have many disadvantages, such as reduction swelling, low softening and melting temperature and so on. Therefore, the flux pellets have been applied in blast furnace widely, especially MgO containing pellets. The light burned magnesite is applied as MgO containing additive in pellet production. The char- acters of light burned magnesite are explored. Meanwhile, the effects of it on low-temperature metallurgical proper-ties are investigated such as low-temperature reduction degradation index （RDI）, compressive strength （CS） and the reduction swelling index （RSI）. The light burned magnesite calcined at 850 ℃ manifests better grindability, larger specific surface area, and higher hydration activity. It is found that the addition of light burned magnesite can im- prove low-temperature metallurgical properties （RDI, RSI） of the pellets. With the increase of light burned magne-site in pellets, the RSI and RDI decrease gradually; when the proportion of light burned magnesite does not exceed 2.0% in pellets, the CS decreases slightly, but it still surnasses 2689 N. which can still meet the demand of BF.

关 键 词：MgO containing additive PELLET RSI RDI 

分 类 号：TF521[冶金工程—钢铁冶金]