摘要
随着铁矿资源的不断劣化,烧结返矿率逐渐上升,影响烧结矿成品率,进而增加烧结工艺的生产成本。过剩烧结返矿的利用是烧结行业面临的共同难题。本文采用返矿冷固结压块使其达到入炉要求,为烧结返矿的利用提供新途径。本文借助粗糙度因子(CF)来反映物料中粗颗粒的相对含量,通过计算设计7组不同粒度组成的烧结返矿进行冷固结压块试验,检测生团块的落下强度和抗压强度以及成品团块的抗压强度等指标,研究不同粒度组成对烧结返矿冷固结性能的影响。结果表明,粗糙度因子对冷压团块质量有显著的影响,当粗糙度因子为40时的烧结返矿具有最佳冷固结性能,其生团块落下强度为28次/(0.5 m),抗压强度为72 N/P,成品团块抗压强度为2500 N/P。SEM结果表明,粗糙度因子为40的冷固结团块具有致密的结构和较低的孔隙率。
With the continuous deterioration of iron ore resources,the sinter returns rate gradually increases,which affects the yield of sinter and increases the production cost of the sintering process.The utilization of excess sinter returns is a common problem faced by the sintering industry.In this paper,the cold consolidation and lock block of return are used to meet the requirements of furnace,which provide a new way for the utilization of sinter returns.In this paper,the roughness factor(CF)is used to reflect the relative content of coarse particles in the material,and seven groups of sinter returns with different granulometric composition are calculated and designed for cold consolidation and lock block tests,the drop strength and compressive strength of raw aggregates and the compressive strength of finished aggregates are detected,and the effects of different granulometric compositions on the cold consolidation performance of sinter returns are studied.The results show that the roughness factor has a significant effect on the quality of cold-pressed aggregates,and when the roughness factor is 40,the sinter returns has the best cold consolidation performance,and the drop strength of the raw aggregates is 28 times/(0.5 m),the compressive strength is 72 N/P,and the compressive strength of the finished aggregates is 2500 N/P.The SEM results show that the cold-consolidated aggregates with a roughness factor of 40 have a dense structure and low porosity.
作者
田浩
李玲
黄森
春铁军
TIAN Hao;LI Ling;HUANG Sen;CHUN Tiejun(Anhui University of Technology School of Metallurgical Engineering,Ma’anshan 243032,Anhui,China;Anhui University of Technology School of Energy and Environment,Ma’anshan 243032,Anhui,China)
出处
《烧结球团》
北大核心
2024年第1期87-92,112,共7页
Sintering and Pelletizing
基金
安徽省自然科学基金面上项目(2008085ME175)。
关键词
烧结返矿
冷固结
粗糙度因子
落下强度
抗压强度
sinter returns
cold consolidation
roughness factor
drop strength
compressive strength
作者简介
田浩(1998-),男,硕士研究生,从事烧结球团生产与管理方面的工作;通信作者:春铁军(1984-),男,教授,从事烧结球团理论与新技术方面研究。
