摘要
铜矿经熔炼等工序提取铜后,渣中的铁元素含量通常超过30%(质量分数)。直接还原-磁选制备金属铁是利用铜渣中铁资源的有效途径。以无烟煤为还原剂,用正交实验和单因素实验考察了焙烧温度、焙烧时间、碳铁物质的量比、碱度等因素对铁金属化率的影响。结果表明铁金属化率随焙烧温度、焙烧时间、碳铁物质的量比、碱度的增加先增加后基本保持不变,各因素影响铁金属化率的顺序为焙烧温度>焙烧时间>碳铁物质的量比>碱度。无烟煤直接还原铜渣的工艺条件:焙烧温度为1 100℃,焙烧时间为90 min,碳铁物质的量比1.4,碱度为1.6。在此条件下铁金属化率达到91.84%。
Copper-slag is the residue of copper mine extracted copper by smelting process, and its iron content is more than 30%（mass fraction）.Direet reduction roasting-magnetic separation is an effective way to recycle iron from copper slag. In this work, copper slag was reduced with anthracite as reductive agent.The effects of calcination temperature, calcination time, C/Fe amount-of-substance ratio, and basicity on the iron metallization ratio were investigated by orthogonal and single-factor experiments.The results showed that the iron metallization ratio first increased and then kept constant, when the calcination temperature, calcination time, C/Fe amount-of-substance ratio, and basicity increased.The order of the each factor was as fol- lows,calcination temperature〉calcination time〉C/Fe amount-of-substance ratio〉basicity.The optimal conditions of reducing iron from the copper slag were as follows： calcination temperature was 1 100 ℃, calcination time was 90 min, C/Fe amount-of- substance ratio was 1.4, and basicity was 1.6.The iron metallization ratio could be up to 91.84% at the optimum conditions.
出处
《无机盐工业》
CAS
北大核心
2014年第6期51-55,共5页
Inorganic Chemicals Industry
基金
国家自然科学基金(21166003)
教育部博士点基金(20114501110004)
关键词
铜渣
无烟煤
还原焙烧
金属铁
copper slag
anthracite
reduction roasting
metallic iron
