活化处理的金尾矿对碱矿渣水泥抗压强度与水化产物的影响

Effect of Activated Gold Tailings on Compressive Strength and Hydration Products of Alkali Activated Slag

摘要: 对金尾矿进行热活化、机械活化和热碱活化处理，研究了不同尾矿掺量(0 wt%、10 wt%、20 wt%、30 wt%、40 wt%)对碱矿渣水泥抗压强度与水化产物的影响。对净浆试样开展抗压强度试验和XRD分析，试验结果表明：热碱活化是提高金尾矿反应活性最有效的方式，其次是机械活化，450℃热活化处理无法提高金尾矿的活性；碱尾矿–矿渣水泥中主要的水化产物是C-(N)-A-S-H凝胶；掺加尾矿会降低碱尾矿–矿渣水泥的抗压强度，10%掺量的试样强度下降幅度为2.00%~6.12%，40%掺量的试样强度下降幅度为在10.59%~17.85%之间。

Abstract: In order to explore the effects of gold tailings treated by different activation methods on mechanical properties and hydration products of alkali slag cement, the tailings were pretreated by thermal activation, mechanical activation and thermo-alkali activation, and the treated tailings were replaced by the slag to prepare alkali activated tailings/slag at the substitution rates of 0 wt%, 10 wt%, 20 wt%, 30 wt% and 40 wt%. The mechanical properties and hydration products of alkali activated tailings/slag were studied by compressive strength test and XRD analysis. The results show that alkali-heat activation is the most effective way to improve the activity of gold tailings, followed by mechanical activation, and heat activation alone cannot improve the activity of gold tailings. The main hydration product in alkali activated tailings/slag is C-(N)-A-S-H gel. The compressive strength of alkali activated tailings/slag will decrease as the addition of tailings, the strength of the specimens with 10% content decreases by 2.00%~6.12%, and the strength of the specimens with 40% content decreases by 10.59%~17.85%.