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30 min, 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588 kg/m3, 抗压强度为3.99 MPa 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0.9 nm 托贝莫来石、1.1 nm 托贝莫来石、1.4 nm 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。
The SiO2 content of iron ore tailings was 55.88%, the metallogenic geological environment was unique and complex in the study area. The tailings was low-silicon magnet with rich source of iron silicate tailings, mainly composed of quartz, amphibole and plagioclase. To maximize use of iron ore tailings, autoclaved aerated concrete (AAC) samples in the optimized plan were successfully prepared with a bulk density of 588 kg/m3 and compressive strength of 3.99 MPa after the iron ore tailings was milled for 25 min and silica sand for 30 min. The results showed that by analysis of X-ray and reaction mechanism the main mineral phases in the AAC products are 0.9 nm tobermorite, 1.1 nm tobermorite, 1.4 nm tobermorite, and C-S-H hydration products, ferrotschermakite, anhydrite, calcite, dolomite and residual quartz The high strength was obtained because the C-S-H gel as a binder and the tobermorite are cemented into each other.
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