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时间:2020-03-24
《含冷芯盒芯砂粘土砂的完全再生砂改性技术研究.pdf》由会员上传分享,免费在线阅读,更多相关内容在行业资料-天天文库。
1、第3l卷第6期山东建筑大学学报Vo1.31No.62016薤12月JOURNALOFSHANDONGJIANZHUUNIVERSnYDec.2016文章编号:1673—7644(2016)06—0543—06含冷芯盒芯砂粘土砂的完全再生砂改性技术研究孙清洲,郝学杰,杜航,孙益民,许荣福,任文成(1.山东建筑大学材料科学与工程学院,山东济南250101;2.山东省铸造清洁生产工程技术研究中心,山东济南250101;3.山东大学材料科学与工程学院,山东济南250061)摘要:含冷芯盒芯砂粘土砂的完全再生砂与原砂相比,平均细度无明显变化、粒形更加圆整、泥分含量降低、耗酸
2、值较高,而再生砂混制冷芯盒树脂砂的强度明显下降,降低了其铸造工艺性能。文章运用完全再生砂改性技术,采用加酸+烘干+机械搓擦+风选的改性工艺对含冷芯盒芯砂粘土砂的完全再生砂进行改性处理,并对其改性处理效果进行了验证。结果表明:以盐酸水溶液为改性剂对含冷芯盒芯砂粘土砂的完全再生砂进行改性,可明显提高其混制冷芯盒树脂砂时的铸造工艺性能;含冷芯盒砂芯砂粘土砂的完全再生砂改性工艺适宜改性剂浓度为3mol/L,均化时间为60min;由含冷芯盒芯砂粘土砂的完全再生砂改性砂混制冷芯盒树脂砂的即时抗拉强度和1h抗拉强度均接近由同种新砂混制冷芯盒树脂砂的性能。关键词:粘土砂;冷芯盒;
3、完全再生砂;改性中图分类号:TG221文献标识码:AModificationtechnologyoftotalreclamationsandreclaimedfromtheusedgreensandcontainingcoldboxresinsandSunQingzhou,HaoXuejie,DuHang,eta1.(1.SchoolofMaterialScienceandEngineering,ShandongJianzhuUniversity,Jinan250101,China;2.ShandongProvincialFoundryCleanerProduct
4、ionEngineeringTechnologyResearchCenter,Jinan250101,China)Abstract:Comparedwiththepropertiesofthesamebasesand,thetotalreclamationsandreclaimedfromtheusedgreensandcontainingcoldboxresinsandarefoundthattheAFSfinenessisnotchangedmuch,thegrainshapeisnearround,themudcontentislower,theacidde
5、mandvalueishigher,thestrengthofthecoldboxresinsandislowerthan.Improvingthecastingtechniquepropertiesofthecoldboxresinsandmixedbythesandreclaimedfromtheusedgreensandcontainingcoldboxresinsand,themodificationtechnologyofthetotalreclamationsandisresearched.Whenthetotalreclamationsandispr
6、eparedwith“addedacid+drying+mechanicalrubbing+separationofmicro—powder”modificationtechnology,theaciddemandvalueofthereclamationsandismuchlowerthanbeforemodificationhasimprovedsignificantly.Whenthemodifierconcentrationis3mol/L,theamountofmodifierputtingintothereclamationsandis1%ofther
7、eclamationsandweights.thelaiduptimeafteraddingmodifieris60minutes,theinstanttensilestrengthis1.282MPaandthelhtensilestrengthis1.538MPaofthecoldboxresinsandmixedbythereclamationsand.Theinstanttensilestrengthandthe1htensilestrengthisbestandnearthetensilestrengthofthecoldcoreboxresinsand
8、mixed
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