添加剂对铜渣改性过程中磁铁矿相析出与长大的影响  

Effect of Additives on Precipitation and Growing of Magnetite during Modifying Progress of Copper Smelting Slag

作　　者：曹洪杨[1] 王继民[1] 张力[2] 隋智通[2] 

机构地区：[1]广州有色金属研究院稀有金属研究所,广州510650 [2]东北大学材料与冶金学院,沈阳110819

出　　处：《有色金属（冶炼部分）》2013年第6期6-10,共5页Nonferrous Metals（Extractive Metallurgy)

基　　金：国家自然科学基金重点资助项目(50234040)

摘　　要：采用高温氧化改性的方法富集含铜熔渣中的铁。研究了添加剂种类对磁铁矿相析出与长大的影响,结合相图考察了添加剂作用下磁铁矿相结晶量、晶粒度及晶体形貌的变化,并初步探讨了添加剂的作用机理。结果表明,添加2%～5%的CaO量有利于磁铁矿相的析出;添加1%～3%的CaF2对磁铁矿相的析出与长大、粗化有一定的促进作用;新型复合添加剂既降低了熔渣的黏度和熔化性温度,也提高了熔渣的碱性,对磁铁矿相析出、长大的作用显著;磁铁矿相体积分数达到41.5%～42.4%,晶粒呈粗大等轴晶,晶粒尺寸50.2～55.6μm,有利于改性渣中磁铁矿的选矿分离。The iron in copper smelting slag was enriched with high temperature oxidation modification process.The effects of different kinds of additives on precipitation and growing behavior of magnetite phase were analyzed.The changes of quantity of crystallization,grain size and crystal morphology of magnetite phase under additives were investigated with combination of the analysis of phase diagram,and the mechanisms of action of additives were given a preliminary discussion.The results show that addition of 2%～5% CaO is in favor of magnetite precipitation,and 1%～3%addition of CaF2can promote precipitation,growing and coarsening of magnetite.The new type of composition additives can obviously promote precipitation and growing of magnetite with the volume fraction of 41.5%～42.4%and 50.2～55.6μm equiaxed grains.It is beneficial to separation of magnetite from modified slag by mineral processing.

关 键 词：添加剂 铜渣 磁铁矿 析出 长大 

分 类 号：TF811[冶金工程—有色金属冶金] TF534.2