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Experimental study on the utilization of metallic tailings as cement active admixture

摘要：选取烧失量低于10%,SO₃含量低于3%,SiO₂、Al₂O₃含量较高,适于作水泥混合材的6种金属尾矿进行水泥混合材活性试验研究.6种金属尾矿分别按10%、15%、20%、25%、30%与熟料、石膏进行配比.试验结果表明:6种金属尾矿不同掺配比活性试验的R₂₈在68.72%～76.54%之间,高于活性混合材R₂₈为62%的判定指标,由此可认为此6种尾矿均属于活性混合材,可单独用作水泥活性混合材;6种金属尾矿掺配比在小于30%的范围内,水泥安定性、凝结时间等性能指标均符合普通硅酸盐水泥要求;6种金属尾矿掺配比在小于30%的范围内其强度均满足32.5R等级水泥强度要求;尾矿掺配比为10%时,6种金属尾矿除3号尾矿外,均满足42.5R等级水泥强度要求.符合要求的金属尾矿用作水泥混合材,将扩大水泥混合材来源,降低水泥粉磨能耗和成本,实现尾矿的资源化和水泥工业的可持续发展.

Abstract：Six kinds of metallic tailings fit for cement admixture were selected with loss lower than 10%, SO₃ amount lower than 3% and higher content of SiO₂ and Al₂O₃.Experiments were performed to evaluate the activeness of these metallic tailings mixed with cement clinker and anhydrite. Metallic tailings were added by 10%,15%,20%,25%and 30% respectively. The preliminary investigation showed that ration of 28 days compressive strength were between 68.72%～76.54% with different metallic tailings addition, which were higher than identification index of 62%. These six metallic tailings belong to active admixture. Experimental results indicated that metallic tailings could be single used as cement active admixture. Furthermore, the analysis indicated When metallic tailings were added less than 30%,cement of 32.5Rgrade would be generated. When metallic tailings were added by 10%,cement of 42.5Rgrade would be generated except No.3 metallic tailings. Cement performances index met ordinary Portland cement standard. Qualified metallic tailings as cement active admixture would enlarge cement admixture resources, reduce cost of cement grinding and production and ameliorate cement performances. Utilization of metallic tailings and sustainable development of cement industry would be realized.