摘要
以国内某典型铜渣为研究对象,进行转底炉直接还原-磁选工艺与转底炉直接还原-燃气熔分工艺的对比研究。首先通过基础试验确定最佳的反应参数,在此基础上进行中试扩大试验,并揭示铜渣转底炉直接还原过程机理,最后对它们的能耗进行计算与对比分析。研究结果表明:经过转底炉直接还原,铜渣中的铁橄榄石Fe_2SiO_4和磁铁矿Fe_3O_4相转变为含有金属铁Fe、二氧化硅SiO_2和少量辉石相Ca(Fe,Mg)Si_2O_6的金属化球团,铁颗粒聚集长大形成铁连晶,具备通过磨选或熔分进行进一步富集的条件。金属化球团通过磨选工艺获得的金属铁粉TFe品位为91.12%,铁回收率为86.36%,通过燃气熔分工艺获得的铁水TFe品位为94.93%,铁回收率为97.52%。转底炉直接还原-燃气熔分工艺能耗比转底炉直接还原-磨选工艺的高约30%。
Taking a domestic copper slag as the subject,comparison between the rotary hearth furnace direct reduction process followed by a magnetic separation process and the same rotary hearth furnace direct reduction process followed by a gas smelting process,were investigated.Firstly,the optimum reaction parameters were determined by basic tests,based on which the pilot plant scale tests were conducted to reveal the direct reduction mechanism of the copper slag in the rotary hearth furnace direct reduction process.Finally,computation and comparison analysis of energy consumption of both processes were carried out.The results show that after direct reduction in the rotary hearth furnace,fayalite(Fe2SiO4)and magnetite(Fe3O4)in the copper slag are phased-changed into iron(Fe),quartz(SiO2)and trace amounts of augite(Ca(Fe,Mg)Si2O6)in the metallized pellets.The reduced iron grains aggregate and grow into iron chain crystals,which is the precondition for further iron enrichment either in the magnetic separation or smelting process.After the metallized pellets go through the magnetic separation process,iron powder with an iron content of91.12%and an iron recovery rate of86.36%is obtained,while hot metal with an iron content of94.93%and an iron recovery rate of97.52%is obtained after the metallized pellets go through the gas smelting process.Energy consumption per ton of product of the rotary hearth furnace direct reduction-gas smelting process is about30%higher than that of the rotary hearth furnace direct reduction?magnetic separation process.
作者
曹志成
孙体昌
薛逊
刘占华
CAO Zhicheng;SUN Tichang;XUE Xun;LIU Zhanhua(Key Laboratory of Ministry of Education for Efficient Mining and Safety of Metal Mines,University of Science and Technology Beijing, Beijing 100083, China;Shenwu Technology Group Corp., Beijing 102200, China)
出处
《中南大学学报（自然科学版）》
EI
CAS
CSCD
北大核心
2017年第10期2565-2571,共7页
Journal of Central South University:Science and Technology
基金
北京市科技专项项目(Z151100001615027)~~
关键词
铜渣
转底炉
磁选
燃气熔分
能耗
copper slag
rotary hearth furnace
magnetic separation
gas smelting
energy consumption
作者简介
通信作者:孙体昌,博士,教授,从事复杂难选矿及冶金渣综合利用研究;E-mail:suntc@ces.ustb.edu.cn
