Activation of Vanadium-titanium Magnetite Tailing and Its Application as Cement Admixture

In this study,mechanical activation and chemical activation methods were used to improve the activity of cement mortar.The effects of activation methods on the structure and properties of tailings were studied.The influences of activation conditions and tailings amount on the mechanical strength of cement mortar were analyzed.The results showed that garnet was the main mineral in the tailings and it was characterized by excellent chemical and structural stability,resulting in poor cementation performance.The cementing performance of tailings was significantly improved after ball milling for 5 h or adding lime.The properties of the gel material mixed with 35% tailings（5 h ball milling） could meet the requirements of 42.5 R composite Portland cement specified in GB 175—2007 standard.This study provides a theoretical basis for the use of vanadium titanium magnetite tailings as cement admixtures.