摘要
针对刚果金含钴氧化铜精矿采用铁橄榄石渣型进行了焦炭还原熔炼,考察了m(CaO)/m(SiO_(2)),m(FeO)/m(SiO_(2))和焦比等对铜、钴还原率的影响.对铜、钴、铁和硅氧化物的还原顺序和还原条件进行了热力学分析,借助金属氧化物还原热力学模型与焦炭气化动力学对铜、钴、铁氧化物的还原进程进行了量化分析.研究结果表明,氧化铜精矿中金属铜、钴、铁的还原分为前期的竞争性快速还原期和后期的铜、钴慢速还原期,在慢速还原期已经还原的金属铁还会发生再氧化;金属铁前期大量的竞争性还原和后期的再氧化会降低铜、钴、铁的还原率和焦炭的有效利用率.揭示了粗铜表面铁合金层的形成机制.
For the cobalt‐bearing copper oxide concentrate from Congo,experiment of coke reduction smelting with fayalite slag was conducted.The effects of CaO‐to‐SiO_(2)mass ratio,FeO‐to‐SiO_(2)mass ratio and coke rate on the reduction rates of copper and cobalt were investigated.The reduction sequence and conditions of copper,cobalt,iron and silicon oxides were analyzed by thermodynamics.The reduction process of copper,cobalt and iron oxides was quantitatively analyzed by means of metal oxide reduction thermodynamics and coke gasification kinetics.The results show that the reduction of copper,cobalt and iron in the copper oxide concentrate can be divided into the competitive fast reduction period in the early stage and the slow reduction period of copper and cobalt in the later stage.The reduced metal iron in the slow reduction period will undergo reoxidation.The large amount of competitive iron reduction in the early stage and its reoxidation in the later stage will reduce the reduction rate of copper,cobalt and iron and the effective utilization rate of coke.The formation mechanism of ferroalloy layer on the surface of crude copper is revealed.
作者
张磊
蒋开喜
谢锋
路殿坤
ZHANG Lei;JIANG Kai-xi;XIE Feng;LU Dian-kun(School of Metallurgy,Northeastern University,Shenyang 110819,China;BGRIMM Technology Group,Beijing 100044,China;Zijin School of Geology and Mining,Fuzhou University,Fuzhou 350108,China)
出处
《东北大学学报（自然科学版）》
EI
CAS
CSCD
北大核心
2024年第3期337-345,共9页
Journal of Northeastern University(Natural Science)
基金
“十三五”国家重点研发计划项目(2019YFC1907304).
关键词
氧化铜精矿
铜
钴
FeO还原
热力学模型
铁橄榄石
copper oxide concentrate
copper
cobalt
reduction of FeO
thermodynamics model
fayalite
