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

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...

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

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/cm³,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.