摘要
以高炉矿渣、铁尾矿、硅藻土、方解石和高岭土为原料,碳化硅为发泡剂,经二阶段高温烧结制备开孔发泡陶瓷。通过测定开孔发泡陶瓷体积膨胀率、气孔结构、显气孔率、吸水率、体积密度和抗压强度,研究了铁尾矿和硅藻土质量比对开孔发泡陶瓷形貌和性能的影响。结果表明:随着铁尾矿掺量增加,开孔发泡陶瓷的体积膨胀率、显气孔率和吸水率先略有升高后逐渐降低,体积密度和抗压强度先略有减小后逐渐增大,平均孔径逐渐减小;当铁尾矿与硅藻土质量比为15∶30时,开孔发泡陶瓷性能最优,其体积膨胀率为36.2%、显气孔率为53.4%、吸水率为87.5%、体积密度为0.526g/cm^(3)、抗压强度为6.18MPa;开孔发泡陶瓷内存在连通孔隙,且孔壁表面的极微小孔隙存在三维网状结构;开孔发泡陶瓷物相主要为铝辉石、辉石以及少量透辉石。研究结果为探究多种矿山固体废物协同制备发泡陶瓷,拓宽发泡陶瓷种类提供了新的依据。
Open-cell foamed ceramics were prepared by two-stage high temperature sintering using blast furnace slag,iron tailings,diatomite,calcite and kaolin as raw materials,silicon carbide as foaming agent.The effects of iron tailings and diatomite ratio on the morphology and properties of open-cell foamed ceramics were studied by measuring volume expansion rate,pore structure,apparent porosity,water absorption,volume density and compressive strength.The results show that with the increase of iron tailings content,the volume expansion rate,apparent porosity and water absorption of open-cell foamed ceramics increase slightly and then decrease gradually,the volume density and compressive strength decrease slightly and then increase gradually,and the average pore size decreases gradually.When the ratio of iron tailings to diatomite is 15∶30,the performance of open-cell foamed ceramics is the best.The volume expansion rate is 36.2%,the apparent porosity is 53.4%,the water absorption rate is 87.5%,the volume density is 0.526 g/cm^(3),and the compressive strength is 6.18 MPa.There are interconnected pores in the open-cell foamed ceramics,and the very small pores on the surface of the pore wall have a three-dimensional network structure.The phase of open-cell foamed ceramics is alumina,pyroxene and a small amount of diopside.The research results provide a new basis for exploring the synergistic preparation of foamed ceramics by various mine solid wastes and broadening the types of foamed ceramics.
作者
李泽华
邢军
孙晓刚
邱景平
刘杰
马征宇
LI Zehua;XING Jun;SUN Xiaogang;QIU Jingping;LIU Jie;MA Zhengyu(School of Resources and Civil Engineering,Northeastern University,Shenyang 110819,China)
出处
《金属矿山》
CAS
北大核心
2022年第10期238-244,共7页
Metal Mine
基金
“十三五”国家重点研发计划项目(编号:2019YFC1907202,2018YFC0604604)。
关键词
高炉矿渣
铁尾矿
硅藻土
开孔发泡陶瓷
显气孔率
抗压强度
blast furnace slag
iron tailings
diatomite
open-cell foamed ceramics
apparent porosity
compressive strength
