烧胀赤泥陶粒的制备

Production of Sintering-Expanded Haydite with Red Mud

探讨了以赤泥为主要原料制备轻质烧胀陶粒的方法:在入炉温度800℃、烧结温度1 200℃、保温时间10 min条件下用自然冷却和快速冷却方式分别制备出膨胀率160%、吸水率14%、筒压强度2.0 MPa和膨胀率175%、吸水率7%、筒压强度3.2 MPa的烧胀陶粒。赤泥陶粒可以用作环境修复材料和建筑工程材料。

In aluminum production red mud is the waste from bauxite.The enormous quantity of red mud every year is a very serious environmental problem.To solve the disposal problem,research and development work for the utilization of red mud are carried out all over the world.A technology of processing expanded red mud haydite with combustion is experimentally introduced in this paper.The effects of mass ratios,feeding and sintering temperature,sintering duration and cooling method to the properties are discussed.The results show that the optimum condition of sintering-expanded haydite fabrication is sintering at 1 200 ℃ for 10 min with raw haydite pellets fed at 800 ℃.This technology allows production of expanded haydite from red mud with properties：expanding rate within the range 160%～175%,cylinder compressive strength within the range 2.0～3.2 MPa,and water absorption rate 7%～14%.