赤泥–粉煤灰免烧砖试样制备及工艺研究

Study on the Preparation and Process of the Sample of Red Mud-Fly Ash Baking-Free Brick

摘要: 本文利用某铝厂所堆存的赤泥，粉煤灰两大固体废物为主要原料，通过添加石灰、石膏、骨料、水泥等激发剂作为辅助材料制备免烧砖试样，并通过SEM方法分析样品。实验表明，最佳掺量：赤泥加入量30%、粉煤灰加入量25%、石膏加入量4%；最佳成型工艺：成型压力为20 MPa，养护温度为75℃，养护时间为9 h，所得到的试样抗压强度可达35.79 MPa，可以满足免烧砖实际生产需要。

Abstract: The sample of baking-free brick has been prepared using the stockpiled solid waste red mud and fly ash as the main raw material, lime, gypsum, aggregate, cement and other activators as auxiliary material, and the morphology of samples were analyzed by using SEM. The experimental results show, the optimum dosage: the content of red mud is 30%, the content of fly ash is 25%, the content of gypsum is 4%, and when the forming pressure is 20 MPa, the curing temperature is 75˚C, and the curing time is 9 h, the compressive strength of the samples can reach 35.79 MPa, and can satisfy the needs of the actual production of baking-free bricks.