镍冶金废渣制备多孔陶瓷及其性能  

Preparation and Properties of Porous Ceramics from Nickel Metallurgical Waste Slag

作　　者：陈秋静 吴其胜[2] 黄子宸 诸华军[2] CHEN Qiujing;WU Qisheng;HUANG Zichen;ZHU Huajun(School of Materials Science and Technology,Jiangsu University,Zhenjiang 212013,China;School of Materials Engineering,Yancheng Institute of Technology,Yancheng 224051,China)

机构地区：[1]江苏大学材料科学与工程学院,江苏镇江212013 [2]盐城工学院材料工程学院,江苏盐城224051

出　　处：《材料科学与工程学报》2021年第1期111-116,146,共7页Journal of Materials Science and Engineering

基　　金：国家自然科学基金资助项目(51572234),江苏省重点研发计划资助项目(BE2018101)。

摘　　要：为使镍冶金废渣再利用,以磁选后镍渣和粉煤灰为主要原料,聚苯乙烯泡沫颗粒小球为造孔剂制备多孔陶瓷,研究了烧结温度和造孔剂加入量对多孔陶瓷性能的影响,节约了工业成本。研究结果表明,体积密度和抗压强度与烧结温度呈正相关,与造孔剂加入量呈负相关,对其进行调整可使体积密度达到200kg/m3以内,抗压强度达到0.4MPa以上,导热系数小于0.06 W/(m·K)。当浆料的固含量为60%、颗粒小球加入量与浆料的质量比为1∶10,在1160℃烧结2h后得到体积密度为199.5kg/m3的轻质多孔陶瓷,此时的抗压强度为0.4 MPa、抗折强度为0.28 MPa、体收缩率为4.21%、导热系数为0.024W/(m·K)。采用X射线衍射仪(XRD)、电子扫描显微镜(SEM)对其微观性能进行研究,发现烧结温度在1160℃开始出现MgAl2O4相,且有利于晶粒长大并提高样品力学性能。In order to reuse nickel metallurgy slag,porous ceramics were prepared using nickel slag after magnetic separation and fly ash as raw materials and expanded polystyrene(EPS)as pore forming agent.The aim of the present work was to investigate the effect of sintering temperature and EPS content and the industrial cost saved.The results show that the volume density and compressive strength are positively correlated with sintering temperature and negatively correlated with the amount of pore-forming agent.By proper adjusting,the volume density reduces to 200 kg/m3 and below,the compressive strength reaches higher than 0.4 MPa,and the thermal conductivity is less than 0.06 W/(m·K).When the solid content of slurry is60%,the mass ratio of EPS to slurry is 1∶10,light porous ceramics with bulk density of 199.5 kg/m3 can be obtained after sintering at 1160 ℃ for 2 hours.The compressive strength,the flexural strength,the volume shrinkage rate and the thermal conductivity of the porous ceramics are 0.4 MPa,0.28 MPa,4.21% and 0.024 W/(m·K),respectively.XRD and SEM work showed that MgAl2O4 phase appeared at the 1160℃,and it was beneficial to grain growth and mechanical properties of the samples.

关 键 词：多孔陶瓷 聚苯乙烯泡沫(EPS) 镍渣 导热系数 

分 类 号：TQ174.12[化学工程—陶瓷工业]