锑尾矿粉基复合胶凝材料的制备及水化特性

以锑尾矿微粉作为主要原料,辅以水泥熟料、活化剂和促凝剂制备锑尾矿粉基复合胶凝材料,并从力学性能及微观结构等方面对复合胶凝材料的水化特性进行探究.结果表明,试件浆体的抗压强度随着锑尾矿微粉掺量的增加而减小,质量掺量为70％时仍满足尾矿固化筑坝要求.不同活化剂对复合胶凝材料强度的影响显著不同,当掺入磷石膏和生石灰且其质量比...

Preparation and Hydration Characteristics of Antimony Tailings Powder-Based Composite Cementitious Material

Antimony tailings fine powder was used as the main raw material, supplemented with cement clinker, activator and accelerator to prepare antimony tailings powder-based composite cementitious material. Hydration characteristics of composite cementitious materials in terms of mechanical properties and microstructure were investigated. The results show that compressive strength of specimen slurry decreases with the increase of the amount of antimony tailings fine powder. When the mass fraction of admixture is 70%, it still meets the requirements of tailings solidification and damming. Effects of different activators on the strength of composite cementitious materials are significantly different. When phosphogypsum and quicklime are mixed and the mass ratio is 2∶1, the activition effect of specimen is the best, and compressive strength reaches 10.42 MPa in 7 d. The final hydration products of specimen slurry are mainly C-S-H gel, calcium hydroxide, and a small amount of ettringite. When aluminate cement is selected as the accelerator and the mass fraction is 3%, it effectively shortens the setting time of specimen and meets the requirements of rapid solidification. The use of antimony tailings powder-based composite cementitious material achieves rapid in-situ solidification of fine-grain antimony tailings.