Jiang Xin, Xie Yunfei, Wang Qingyu, Tian Shuchen, Long Fang, Li Yongqiang, Zheng Haiyan, Gao Qiangjian, Shen Fengman
Key Laboratory for Ecological Metallurgy of Multimetallic Mineral (Ministry of Education), Northeastern University, Shenyang 110819, China.
School of Metallurgy, Northeastern University, Shenyang 110819, China.
ACS Omega. 2025 Jul 14;10(28):30375-30385. doi: 10.1021/acsomega.5c01799. eCollection 2025 Jul 22.
In the ironmaking process, using a high proportional pellet is a good way for energy saving. In order to maintain the basicity and MgO content of slag, CaO and MgO are necessary fluxes of pellets while the proportion of pellets in the furnace is increased. Limited by resource conditions, many iron and steel enterprises, especially in China, do not have enough low-SiO concentrate. Therefore, by preparing medium-SiO fluxed pellets with different basicity and (MgO) conditions, the influence of basicity and (MgO) on the compressive strength of green pellets and fired pellets and the mechanism were investigated. The experimental results show that (1) in the case of (MgO) = 0.5%-2.0%, the compressive strength of the fired pellets first increases and then decreases with the increase in basicity. As the basicity = 0.5, the strength of the fired pellets is the highest. (2) In the case of basicity = 0.0062-2.0, the compressive strength of the fired pellets decreases with the increase in MgO content. As the (MgO) = 0.5, the strength of the fired pellets is the highest. (3) The optimum basicity is 0.5 and (MgO) is 0.5%. Under these conditions, the compressive strength of green pellets and fired pellets can meet the requirements of blast furnace operation. The purpose of this research is to provide a theoretical basis for determining reasonable flux parameters and expand the range of iron ore resources for fluxed pellets.
在炼铁过程中，使用高比例球团是一种节能的好方法。为了维持炉渣的碱度和MgO含量，随着炉内球团比例的增加，CaO和MgO是球团必要的熔剂。受资源条件限制，许多钢铁企业，尤其是中国的钢铁企业，没有足够的低SiO2精矿。因此，通过制备不同碱度和（MgO）条件的中SiO2熔剂性球团，研究了碱度和（MgO）对生球团和焙烧球团抗压强度的影响及其机理。实验结果表明：（1）在（MgO）=0.5%-2.0%的情况下，焙烧球团的抗压强度随碱度的增加先增大后减小。当碱度=0.5时，焙烧球团的强度最高。（2）在碱度=0.0062-2.0的情况下，焙烧球团的抗压强度随MgO含量的增加而降低。当（MgO）=0.5时，焙烧球团的强度最高。（3）最佳碱度为0.5，（MgO）为0.5%。在此条件下，生球团和焙烧球团的抗压强度能够满足高炉操作的要求。本研究的目的是为确定合理的熔剂参数提供理论依据，并扩大熔剂性球团铁矿石资源的范围。
