一种矾土尾矿渣作水泥混合材的试验研究

Experimental Study on Bauxite Tailings as Cement Admixture

本文探讨了一种矾土尾矿渣作为混合材对水泥性能的影响。分析了矾土尾矿渣的矿物及颗粒组成,测定了尾矿渣水泥的标准稠度需水量、凝结时间、强度等性能。结果表明:矾土尾矿渣主要含有高岭石类(多水高岭石、珍珠陶土、地开石等)、一水铝石和云母类(白云母、钾云母、多硅锂云母等)等矿物。经煅烧处理的尾矿渣用作混合材,水泥的标准稠度需水量偏高,凝结时间明显缩短,抗压强度稍低于矿渣微粉而高于粉煤灰;煅烧处理的尾矿渣与矿渣微粉、粉煤灰复掺,有助于降低需水量及提高水泥强度。

Effect of cement properties which using a bauxite tailings as admixture was studied. The mineral composition and the particle size distribution of the bauxite tailings were analyzed. The water demand at standard consistency, setting time and compressive strength of the bauxite tailings cement were tested. The results showed that： the original bauxite tailings contain the minerals of a class of kaolinite（halloysite, nacrite, dickite）, diaspore and a class of mica（muscovite, potassium mica,polylithionite）. Taking the burned bauxite tailings as admixture, the cement standard consistency was higher, the setting time was shortened obviously and the compressive strengths were a little lower than which with the fine blast furnace slag but higher than the fly ash. The burned bauxite tailings and fine blastfurnace slag and fly ash compositing together as admixture, the standard consistency was apt to decrease and the compressive strength increased.