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

Abstract

Abstract: 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.

Key words: antimony tailing, solidification, activator, strength, hydration characteristic

CLC Number:

TQ584⁺.31

WANG Hao, DENG Hang, LIU Shuhua. Preparation and Hydration Characteristics of Antimony Tailings Powder-Based Composite Cementitious Material[J]. BULLETIN OF THE CHINESE CERAMIC SOCIETY, 2021, 40(2): 534-541.

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