低硅低碱度烧结试验与热力学计算分析  

Low-silicon and low-alkalinity sintering test and thermodynamic calculation analysis

作　　者：郭亮[1] 尹浩 李光辉[2] 刘会波 GUO Liang;YIN Hao;LI Guanghui;LIU Huibo(Hunan Valin Lianyuan Iron&Steel Co.,Ltd.,Xiangtan 417009,Hunan,China;School of Minerals Processing and Bioengineering,Central South University,Changsha 410083,Hunan,China)

机构地区：[1]湖南华菱涟源钢铁有限公司,湖南娄底417009 [2]中南大学资源加工与生物工程学院,湖南长沙410083

出　　处：《烧结球团》2023年第2期17-24,共8页Sintering and Pelletizing

摘　　要：低硅低碱度烧结可以提高烧结矿铁品位,但会恶化烧结矿质量。本文以涟钢烧结原料作为研究对象,从理论和烧结杯试验两方面对低硅低碱度烧结的可行性和下限进行研究。研究结果表明,烧结液相的生成量受碱度和SiO_(2)质量分数的影响很大,且烧结混合料的液相生成量与烧结矿转鼓强度呈线性相关关系;通过优化配矿,改变混合料中黏附粉的质量分数和液相生成能力,可以实现混合料中液相生成总量不变;理论分析和烧结杯试验均表明,低SiO_(2)质量分数烧结可以实现,但低碱度烧结难以实现,这是由于低碱度烧结会降低黏附粉的液相生成能力;低硅烧结可以实现SiO2质量分数从5.0%降低至4.6%,提高烧结矿的铁品位0.62%,减少熔剂消耗量8.90 kg/t,低硅烧结产品的显微结构与基准产品一致,冶金性能也与基准产品相当。Low-silicon and low-alkalinity sintering can improve the iron grade of sinter,but it will deteriorate the quality of sinter.The sintering raw materials from Lianyuan Iron&Steel Co.,Ltd.are used as the research object.The feasibility and lower limit of low-silicon and low-alkalinity sintering are studied from such two aspects as theory and sinter pot test.The results show that the sintering liquid phase quantity is greatly affected by alkalinity and SiO_(2)mass fraction,and the liquid phase generation of sintering compound is linearly related to the sinter tumbler strength.By optimizing the blending and changing the mass fraction of the adhesion powder and the liquid phase generation capacity in the compound,the total amount of liquid phase generation in the compound can be unchanged.Theoretical analysis and sinter pot test show that low SiO_(2) mass fraction sintering can be achieved,but low-alkalinity sintering cannot be achieved,because low-alkalinity sintering will reduce the liquid phase generation capacity of adhesion powder.Low silicon sintering can reduce the SiO_(2)mass fraction from 5.0%to 4.6%,increase the iron grade of the sinter by 0.62%,reduce flux consumption by 8.90 kg/t,and the microstructure of the low-silicon sintering product is consistent with the benchmark product,and the metallurgical performance is comparable to the benchmark product.

关 键 词：烧结 液相量 碱度 SIO2 热力学计算 

分 类 号：TF046.4[冶金工程—冶金物理化学]