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以富含Si、Al的尾矿作为硅铝原料(基质),以硅灰和钙质掺和料(矿渣和钢渣)作为辅助材料,在低温煅烧条件下制备地聚合物水泥粉料。以向粉料中“直接加水”形成的砂浆试样的7 d抗压强度作为考察指标,通过正交实验得出最优的原料配方和烧制温度,并通过SEM、XRD、TG-DSC和FTIR对代表性试样的微观结构进行表征。结果表明:“钙质掺合料与尾矿的质量比例”这一因素对砂浆试样的抗压强度影响最大;以矿渣和钢渣为钙质掺合料在最优方案下制备的砂浆试样的7 d抗压强度分别达到12.5 MPa和8.5 MPa,对它们进行蒸压养护可使其抗压强度有所提升;微观结构分析共同验证了由钙质掺合料生成的水化硅酸钙(CSH)未对地聚合物的主体凝胶相产生负面影响,反而有利于改善试样的微结构,提高试样的强度性能。
In this paper, Si-Al and T-Al tailings were used as raw materials of silica and alumina (matrix), and silica cement and calcareous admixture (slag and steel slag) were used as auxiliary materials to prepare polymer cement powder under low temperature calcination. The 7 d compressive strength of mortar samples formed by “direct addition of water” in the powder was taken as the investigation index, and the optimum raw material formula and firing temperature were obtained by orthogonal experiments. SEM, XRD, TG- The microstructure of a representative sample was characterized by DSC and FTIR. The results show that: “the mass ratio of calcium admixture to tailings” has the greatest influence on the compressive strength of mortar samples; mortar prepared from slag and slag as the calcium admixture under the optimum conditions The compressive strength of the samples reached 12.5 MPa and 8.5 MPa at 7 days respectively, and the compressive strength of these samples was improved by autoclave curing. The microstructure analysis verified the hydrated silicic acid Calcium (CSH) did not exert a negative influence on the main gel phase of geopolymer, on the contrary, it improved the microstructure of the sample and improved the strength properties of the sample.