赤泥轻质保温材料的制备与试验研究

Study and Preparation of Red Mud Lightweight Thermal Insulation Material

以赤泥、粉煤灰、石英砂等为主要原材料,经掺加物理泡沫、浇注、煅烧等工艺制备了赤泥轻质保温材料,研究了煅烧温度及升温速率对其性能的影响;利用扫描电子显微镜观察其微观形貌,并探讨其烧结机理.结果表明:在最佳煅烧温度1 150℃,最佳升温速率6℃/min条件下制备的赤泥轻质保温材料,其堆积密度为527kg/m3,收缩率为5.7%,抗压强度和抗折强度分别为3.4MPa和2.2MPa,导热系数为0.105W/(m·K),孔隙率(体积分数)为33.61%.

The lightweight thermal insulation material was prepared with red mud, fly ash and silica sand as the main raw material, by the technology of mixing with physical foam, casting, calcination and so on. The influence of calcined temperature and heating rate on performances of sample was studied, the mor- phology was observed by scanning electron microscopy（SEM）, and the sintering mechanism was explored. The results show that the optimum calcined temperature is 1 150 ℃, the optimum heating rate is 6 ℃/min. Under the optimum condition, the bulk density is 527 kg/m3 , the shrinkage is 5. 7%, the compressive strength and flexural strength are 3.4 MPa and 2.2 MPa, the thermal conductivity coefficient is 0. 105 W/（m · K）, the porosity is 33.61%（by volume）.