Activation of Vanadium-titanium Magnetite Tailing and Its Application as Cement Admixture
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摘要: 利用机械活化及化学活化的方法,提高了尾矿的反应活性,并研究了活化方式对尾矿结构及反应活性的影响,分析了活化条件和尾矿掺入量对水泥砂浆力学强度的影响。结果表明:钙铁榴石是该尾矿的主要矿物,它具有优良的化学结构稳定性,从而导致尾矿的胶结性能较差。采用球磨时间5 h或以石灰为激发剂的条件,可明显提高尾矿的反应活性。机械活化的效果明显优于化学活化,掺入35%尾矿(球磨5 h后)的水泥砂浆性能达到了GB 175—2007《通用硅酸盐水泥》中42.5 R复合硅酸盐水泥的标准。本研究为钒钛磁铁矿尾矿用作绿色水泥混合材提供了理论依据。Abstract: 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.
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