碳酸钙对磷渣-煤矸石烧结多孔微晶玻璃结构和性能的影响  

Effect of calcium carbonate on the preparation of porous glass-ceramics from phosphorus slag and coal gangue

作　　者：管艳梅[1] 陈伟[1] 孙道胜[1] 刘开伟[1] 李萍[1] GUAN Yanmei;CHEN Wei;SUN Daosheng;LIU Kaiwei;LI Ping(Anhui Key Laboratory of Advanced Building Materials, Anhui Jianzhu University, Hefei 230022, China)

机构地区：[1]安徽建筑大学先进建筑材料安徽省重点实验室,合肥230022

出　　处：《功能材料》2021年第4期4105-4109,共5页Journal of Functional Materials

基　　金：安徽建筑大学校级科研资助项目(JZ202015);安徽省教育厅科学研究一般资助项目(KJ2018JD18)。

摘　　要：多孔微晶玻璃具有导热系数低、力学性能好、抗腐蚀性强等优点,是一种隔热、吸声的轻质功能材料。为拓展多孔微晶玻璃的制备原料范围,同时大宗量、高附加值利用工业废渣-磷渣和煤矸石。本文以磷渣和煤矸石为原料,采用烧结法制备多孔微晶玻璃。利用X射线衍射、扫描电子显微镜及阿基米德法,对制备的试样进行表征,研究发泡剂碳酸钙掺量对体系析晶、发泡和宏观性能的影响。研究表明,碳酸钙掺量不影响体系析晶相的种类,但体系析晶度随碳酸钙掺量增加先增大后减小;碳酸钙掺量为2%~6%(质量分数)时,增大掺量,利于发泡。体系中气孔孔径增大且趋于均匀,试样孔隙率增大,体积密度降低。但随着掺量进一步增大,体系发泡效果降低。当碳酸钙掺量为4%~8%(质量分数)时,可获得体积密度为0.86~0.92 g/cm^(3),孔隙率为60.7%~70.3%,抗压强度为7.89~15.11 MPa,性能较优的硅灰石多孔微晶玻璃。本研究以工业废渣为原料,降低了多孔微晶玻璃的制备成本,同时为工业废渣利用提供一种途径借鉴,具有深远的资源和环保意义。Porous glass-ceramics is a lightweight functional material suitable for thermal and acoustic insulation,since they possess a low thermal conductivity,good mechanical property,high permeability and chemical inertness.In order to develop the applications of phosphorus slag and coal gangue and expand the range of raw materials for the preparation of porous glass-ceramics,porous glass-ceramics is prepared by sintering method with phosphorus slag and coal gangue as the source of CaO and Al2O3 and calcium carbonate as foamer.The slag utilization rate reaches 100%.Effects of the foamer on the bulk density,pore size,porosity,crystalline structure,microstructure and compressive strength of the porous glass-ceramics are investigated by means of X-ray diffractometer,scanning electron microscopy and Archimedes method.The experiment results show that calcium carbonate increasing from 2wt%to 6wt%makes the foaming process easier and the pore size get more uniform.Consequently,the bulk density decreases,while the porosity increases.However,with increasing calcium carbonate from 6 wt%to 12 wt%,the pore size distribution becomes extremely uneven.The crystallinity and compressive strength of the porous glass-ceramics increases first and then decreases with the increasing of calcium carbonate contents.The homogenous porous structures and optimal comprehensive properties achieve with 4wt%-8wt%CaCO3 addition,including a bulk density of 0.86-0.92 g/cm^(3),porosity of 60.7%-70.3%,and compressive strength of 7.89-15.11 MPa.The experimental compositions allow recycling industry wastes to produce porous glass-ceramics with suitable properties with environmental benefits.

关 键 词：碳酸钙 多孔微晶玻璃 磷渣 煤矸石 体积密度 

分 类 号：TQ171.73[化学工程—玻璃工业]