Study on the Mechanism of Fired Bricks from Iron Tailings
Fired bricks were prepared by using iron tailings from Inner Mongolia as the main material based on analysis of its basic characterization and investigate the performance and mechanism of fired bricks at different firing temperature.The results showed that the density and compressive strength increased with the rise of firing temperature,while the water absorption decreased.The analysis demonstrated that calcite was decomposed into CaO and CO2 at 800℃ completely by DTA-TG and XRD,which lead to the increase of pore and decrease of density.Kaolinite was decomposed into metastable quartz and metakaolin at about 850℃ and then hornblende transformed into quartz and hematite with the rise of temperature.The SEM photographs showed that the glass phase was increased and the sheetlike fabric was decreased when the firing temperature rose to 1100℃.The glass phase was filled into the pores contributing to the decrease of the porosity and making the bricks more compact which help to improve the bulk density and compressive strength.The glass phase was concerned with the reaction,which can help the grain diffusion and thus increase the speed of reaction.
iron tailings fired brick firing temperature mechanism
Liu Lianhua Du Gaoxiang Liao Jinghui
School of Material Science and Technology, China University of Geosciences(Beijing),China
国际会议
太原
英文
620-624
2012-06-23（万方平台首次上网日期，不代表论文的发表时间）