铅锌冶炼废渣和尾矿制备地聚合物的研究

以铅锌冶炼废渣、尾矿为主要硅铝原料制备了地聚合物,首先对冶炼废渣和尾矿进行预粉磨,以提高其活性,再与复合激发剂水玻璃和脱硫石膏混合后粉磨,通过压制成型工艺制得地聚合物试样。实验结果表明:当水玻璃掺量为14%,脱硫石膏掺量为8%时,所制得的地聚合物胶凝材料3d、7d和28d龄期抗压强度均最高,分别达到24.67MPa、27.69MPa、32.81MPa。SEM、XRD和FT-IR分析表明:以铅锌冶炼废渣和尾矿制得的地聚合物,其微观结构致密性好,无定形的凝胶与未反应的原料颗粒界面黏结牢固,并有针状钙矾石穿插其中,从而有助于强度的提高。

Geopolymer synthesis by utilizing lead or zinc smelting slag and its tailing as raw materials

In order to realize the recycling of the secondary resources, the investigation of geopolymer synthesis was presented utilizing lead or zinc smelting slag and its tailing as the main Si-Al source materials. Firstly, the smelting slag and its tailing was pre-grinded, so as to enhance its reactivity. Then the pre-grinded smelting slag and tailings blended with the compound activators composed of sodium silicate and desulfurized gypsum was further grinded. Geopolymer samples were prepared by compressed-casting technology. As the results showed, the highest 3-day, 7-day and 28-day compressive strength of geopolymer samples were 24.67MPa, 27.69MPa and 32.81MPa respectively when the dosage of sodium silicate was about 14wt% and the desulfurized gypsum was about 8wt%. SEM, XRD and FT-IR analysis of samples indicated that the geopolymer with dense microstructure composed of homogenous gel and acicular AFt crystal was obtained using lead or zinc smelting slag and tailing as raw materials. The different phases were closely combined in the geopolymer structure and the strength was found to be enhanced.