锰结合熔体保温再生铝降铁机制的探讨  

Iron Deposition Mechanism in Recycled Aluminum under Adding Mn Element Combined with Melt Holding

作　　者：宋东福 王顺成 郑开宏 黄正华 农登 杨莉 Song Dongfu;Wang Shuncheng;Zheng Kaihong;Huang Zhenghua;Nong Deng;Yang Li(Guangdong Institute of Materials and Processing, Guangzhou 510650, China)

机构地区：[1]广东省材料与加工研究所

出　　处：《稀有金属》2018年第5期555-560,共6页Chinese Journal of Rare Metals

基　　金：广东省科技厅科技计划项目(2014B030301012,2017A050503004,2016B090931004);广州市珠江科技新星专项(201806010126);广东省科学院项目(2017GDASCX-0117);四会市科技计划项目(2016A0918004)资助

摘　　要：在含1.0%Fe的A356铝合金中加入1.2%的Mn,经850℃熔化后降至615-680℃保温1 h。采用光学显微镜（OM）、扫描电子显微镜（SEM）和能谱仪（EDS）等研究手段研究保温温度对富铁相沉降效率及机制的影响。研究结果表明,随着保温温度的降低,再生铝中含铁量逐渐降低,615℃时除铁率可达46.7%;基体中初生铁相随温度的降低由星形演变成多边形,615℃时初生富铁相基本消失。而炉渣则为规则的多边形,圆整度达到0.86;炉渣中及660℃保温时初生富铁相的Mn/Fe原子比较其余保温温度下基体中初生铁相大,达到1.70;不同保温温度下,富铁相的沉降过程分为4个阶段,前3个阶段影响富铁相沉降效率的最大因素分别为：富铁相形态、富铁相尺寸、富铁相密度。Different Mn content for A356 aluminum alloy with containing 1. 0% Fe was added. The effects of melt holding temperature on the deposition efficiency of iron in recycled aluminum were researched by using optical microscope(OM）,scanning electron microscope(SEM）,energy dispersive spectrometer(EDS） and other modern research tools,and the deposition mechanism of iron was investigated. The results showed that the iron content in recycled aluminum decreased gradually with the holding temperature decreasing. And the iron deposition efficiency reached to 46. 7% when the melt holding temperature decreased to 615 ℃. The primary iron phase in substrate was evolved from star to polygonal with holding temperature decreasing,and then almost disappeared at 615 ℃. Moreover,the slag phase exhibited regular polygon with a roundness of 0. 86. The Mn/Fe atom ratio of the primary iron-rich phase in the slag and at 660 ℃ reached to 1. 70,which was larger than that of the other holding temperature. The deposition process of iron-rich phase was divided into four stages under different holding temperatures. And the biggest deposition efficiency factors of iron-rich phase in the first three stages were iron-rich phase,iron-rich phase and iron-rich phase.

关 键 词：熔体保温 再生铝 富铁相 沉降机制 

分 类 号：TG146[一般工业技术—材料科学与工程]