摘要
以褐煤为还原剂,采用直接还原-磁选方法对含铁39.96%(质量分数)的水淬铜渣进行回收铁的研究。在原料分析和机理探讨基础上,提出影响铜渣中铁回收效果的主要工艺参数,并进行试验确定。结果表明:在铜渣、褐煤和CaO质量比为100:30:10,还原温度为1 250℃,焙烧时间为50 min,再磨细至85%的焙烧产物粒径小于43μm的最佳条件下,可获得铁品位为92.05%、回收率为81.01%的直接还原铁粉;经直接还原后,铜渣中的铁橄榄石及磁铁矿已转变成金属铁,所得金属铁颗粒的粒度多数在30μm以上,且与渣相呈现物理镶嵌关系,易于通过磨矿实现金属铁的单体解离,从而用磁选方法回收其中的金属铁。
In order to recycle iron from copper slag with total iron content（TFe） of 39.96%（mass fraction）,a technique with lignite-based direct reduction followed by magnetic separation was presented.After analysis of chemical composition and crystalline phase,according to experimental mechanism,the tests for studying the effects of different parameters on the recovery of iron were carried out.The results show that the optimum parameters are proposed as follows： the mass ratio of copper slag/lignite/CaO is 100：30：10,the reduction temperature is 1 250 ℃,the time is 50 min,and the particle size of 85% roasted product is smaller than 43 μm,under which the direct reduction iron powders with TFe of 92.05% and iron recovery rate of 81.01% are obtained.After reduction,the fayalite（Fe2SiO4） and magnetite（Fe3O4） in copper slag are reduced to metallic iron.The metallic iron particles whose sizes are mainly larger than 30 μm,are loosely supported on the surface of slag particles.So the monomer dissociation of metallic iron particles is easily achieved by grinding,then the dissociated metallic iron particles are recovered via magnetic separation method.
出处
《中国有色金属学报》
EI
CAS
CSCD
北大核心
2011年第5期1165-1170,共6页
The Chinese Journal of Nonferrous Metals
关键词
铜渣
直接还原
磨矿
磁选
金属铁
copper slag
direct reduction
grinding
magnetic separation
metallic iron
