熔模铸造废弃型壳再生利用研究  

Study on Recycling of Waste Mold Shell from Investment Casting

作　　者：房宇 李家波 李晓杰 高永旺 白晓鹭 刘越 FANG Yu;LI Jia-bo;LI Xiao-jie;GAO Yong-wang;BAI Xiao-lu;LIU Yue(School of Material Science and Engineering,Northeastern University,Shenyang 110819,Liaoning,China;Zhangwu County Lianxin Foundry Silica Co.,Ltd.,zhangwu 123200,Liaoning,China;Liaoning xianghe Animal Hushangry Indastry Co.,Ltd.,Fuxin 123000,Liaoning,China)

机构地区：[1]东北大学材料科学与工程学院,辽宁沈阳110819 [2]联信铸砂集团,辽宁彰武123200 [3]辽宁祥和农牧实业有限公司,辽宁阜新123000

出　　处：《铸造》2021年第2期180-188,共9页Foundry

摘　　要：以熔模铸造废弃型壳为原材料,研究了废弃型壳处理工艺,可达到100%回收利用。从废弃型壳中提取高价值电熔白刚玉面砂,并利用废弃型壳剩余粉料,加入铝矾土、CaO、TiO_(2)等作为添加剂,机械球磨、造粒、固态烧结制备陶粒砂,研究了不同添加剂种类以及加入量对陶粒砂形貌和性能的影响。研究发现,利用机械球磨有效分离熔模铸造废弃型壳中高价值电熔白刚玉颗粒,可获得占废弃型壳重量7%~10%,粒径109~270μm的高价值电熔白刚玉颗粒。添加TiO_(2)、CaO作为球形陶粒砂助烧剂,可通过固溶置换以及形成低温液相分别将烧结温度降低至1500℃和1375℃。单独添加1%TiO_(2)时,1500℃烧结保温2~3 h,陶粒砂堆积密度为1.68 g/cm^(3),真密度为3.058 g/cm^(3),显气孔率为10.6%,破碎率为1.58%;单独添加7%CaO时,1375℃烧结保温2~3 h,陶粒砂的基本性能为堆积密度为1.71 g/cm^(3),真密度为2.834 g/cm^(3),显气孔率降低至6.03%,破碎率仅为1.47%。In this work,the recycling technology of the waste mold shell from investment casting was studied,which can achieve 100%recycling.High value fused white corundum surface sand was firstly extracted from the waste mold shell,and then the residual powder of the waste mold shell was mixed with bauxite,CaO and TiO_(2) as additives and the mechanical ball milling,granulation and solid-state sintering were carried out to prepare the ceramsite sand.The effects of different additives and their amounts on the morphology and properties of the ceramsite sand were studied.It was found that the high-value fused white corundum particles could be separated out from the waste shell of investment casting,up to 7%-10%of the weight of the waste shell,with the particle size of 109-270μm,by the mechanical ball milling.Adding TiO_(2) and CaO as the sintering aids could reduce the sintering temperature to 1500℃and 1375℃,respectively,by solid solution replacement and forming low temperature liquid phase.When 1%TiO_(2) was added alone,the sintering temperature was kept at 1500℃for 2-3 h,the bulk density of ceramsite sand was 1.68 g/cm^(3),the true density was 3.058 g/cm^(3),the apparent porosity was 10.6%,and the crushing rate was 1.58%.When 7%Cao was added alone,the basic properties of ceramsite sand were 1.71 g/cm^(3) of bulk density,2.834 g/cm^(3) of true density,6.03%of apparent porosity and 1.47%of crushing rate.

关 键 词：熔模铸造 废弃型壳 人造球形陶粒砂 电熔白刚玉 

分 类 号：TG249.5[机械工程—精密仪器及机械]