中南大学学报（自然科学版）2025，Vol.56Issue(7)：2657-2668,12.DOI:10.11817/j.issn.1672-7207.2025.07.004
低碳型红土镍矿基冷固结球团制备及强度强化研究
Study on preparation and strength enhancement of low carbon laterite nickel ore-based cold bound pellet
摘要
Abstract
To optimize the blast furnace charge structure,low-carbon laterite nickel ore-based cold bound pellets were developed.The sintering return fines,inorganic binder SS and organic binder PR were used to assist in enhancing the low-carbon laterite nickel ore-based cold bound pellets without adding reducing agent.Optimization of the cold bound pellet preparation process parameters was completed.The enhancement mechanisms were analyzed through optical microscopy,SEM-EDS,and IR.The results indicate that the optimal parameters for cold bound pellet SS are lateritic nickel ore mass fraction of 45%,binder mass fraction of 6%,drying time of 75 min and drying temperature of 150℃.Under these conditions,the green pellet compressive strength is 308.28 N·P-1,the dropping number is 7.60 times·(0.5 m)-1,the dry pellet compressive strength is 1 523.42 N·P-1,RDI+3.15 is 62.04%,and RI is 73.66%.For cold bound pellet PR,the optimal parameters are lateritic nickel ore mass fraction of 30%,binder mass fraction of 6%,drying time of 75 min and drying temperature of 200℃.Under these conditions,the green pellet compressive strength is 269.48 N·P-1,the dropping number is 8.20 times·(0.5 m)-1,the dry pellet compressive strength is 1 873.36 N·P-1,RDI+3.15 is 45.30%,and Rl is 56.32%.The strength formation mechanism is revealed to involve the following aspects:the supporting skeleton structure is formed through the interlocking of return fines and laterite nickel ore under external force.Binding effects are created by chemical bonding between minerals and binders.Mechanical support is jointly provided by binder consolidates and binder-mineral mixed consolidates.The organic binder PR is demonstrated to impart excellent cold strength to the pellets,while the inorganic binder SS is shown to contribute to a more stable hot structure during the reduction process.关键词
红土镍矿/返矿/资源循环/冷固结球团/低碳炉料Key words
nickel laterite ore/return fine/resource utilization/cold bound pellet/low carbon furnace charge分类
矿业与冶金引用本文复制引用
郑锡瀚,陈铁军,张浩然,金路恒,李嘉明,黄学忠..低碳型红土镍矿基冷固结球团制备及强度强化研究[J].中南大学学报（自然科学版）,2025,56(7):2657-2668,12.基金项目
湖北省重点研发计划项目(2022BCA062) （2022BCA062）
中国宝武低碳冶金创新基金资助项目(BWLCF202107)(Project(2022BCA062)supported by the Key Research and Development Program of Hubei Province （BWLCF202107）
Project(BWLCF202107)supported by China Baowu Low Carbon Metallurgy Innovation Foudation) （BWLCF202107）
