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科技导报  2015 

铁尾矿物相分析及加气混凝土制备

DOI: 10.3981/j.issn.1000-7857.2015.18.007, PP. 45-48

Keywords: 铁尾矿,加气混凝土,托贝莫来石,C-S-H,凝胶

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Abstract:

研究区域的铁矿尾矿SiO2质量分数达55.88%,其成矿地质环境独特而复杂。尾矿的组成以石英、闪石和斜长石为主,是一种富含硅酸铁的低硅磁铁尾矿。将铁尾矿和硅砂分别粉磨25和30min,在最大限度使用尾矿的条件下,得出生产铁尾矿加气混凝土的优化方案,成功制备出干密度为588kg/m3,抗压强度为3.99MPa的加气混凝土制品。通过XRD和反应机理的分析结果表明,成品中主要的物相为水化产物是0.9nm托贝莫来石、1.1nm托贝莫来石、1.4nm托贝莫来石和C-S-H凝胶,此外还有铁钙闪石、硬石膏、方解石和水化反应中残留的石英,C-S-H凝胶作为“黏结剂”和托贝莫来石相互胶结成一个整体,使制品得到较好的强度。

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