Synthesis of Ca-Al-Si-O Compounds from Local Wastes
The local wastes, which are sources of SiO2, Al203 and CaO, are rice husk ash, waste sediment from aluminum anodizing process and dreg from pulp production, respectively. The wastes are mixed in three different compositions in ranges of 20-50 SiO2, 20-35 CaO and 20-45 Al203, wet milled, slip casted and then fired at 1,100 ℃. Characterization of the fired bodies reveals the formation of calcium-aluminosilicate compounds: gehlenite and anorthite as major phases, in accordance with the SiO2-CaO-Al2O3 ternary diagram. Their bulk densities and % water absorption lies between 0.95-1.42 g/cm3 and 37.40-67.95%, respectively. While flexural strength and coefficient of thermal expansion are between 4.09-9.56 MPa and 6.14 -10.1×10-6 ℃-1,respectively. By simple thermal conductivity comparison, the materials themselves have thermal conductivity comparable to alumina ceramics. These wastes, therefore, may be used as precursors for the production of some insulating refractory members, in place of minerals from natural resources.
rice husk ash aluminum anodizing process dreg from pulp production and calcium-aluminosilicate compounds
U.Sangwanna.Sanewirush P.Saewong
National Metal and Materials Technology Center, Thailand Science Park,Klong Luang, Pathumthani, 12120, Thailand
国际会议
10th International Symposium on Eco-Materials Processing and Design(第10届国际生态材料加工与设计研讨会)
西安
英文
121-124
2009-01-13（万方平台首次上网日期，不代表论文的发表时间）