以铁尾矿砂为主要原料制备加气混凝土的优化研究

发布时间：2018-07-11 14:37

  本文选题：铁尾矿 + 加气混凝土　； 参考：《河北联合大学》2014年硕士论文

【摘要】：近年来，随着我国经济的高速发展，矿产资源需求量大幅增加，尾矿排放量也逐年增加，由此带来的环境问题越来越严重，尾矿的综合利用也越来越受到更多人的重视。与此同时，我国建筑行业蓬勃发展，对建筑材料的需求增长很快，国家对于粘土砖的限制使用促使加气混凝土等新型建筑材料的发展。 课题对铁尾矿砂制备加气混凝土进行研究，主要对原料配比和工艺条件优化选取进行研究。 运用正交试验设计对原料配比进行组合设计，制备出不同原料配比的加气混凝土砌块并检测其抗压强度和制品的绝干密度。运用极差分析等分析各种因素对制品强度和密度的影响，并参照国标要求，最终确定了铁尾矿最大加入量，当铁尾矿砂加入量为62%，生石灰掺量25%，水泥用量10%，石膏加入量3%，铝粉掺量0.1%，水料比为0.65时，可制备出符合国标A5.0，B07级加气混凝土的要求的加气混凝土制品。证明了用棒磨山铁尾矿砂制备加气混凝土的可行性，同时也为类似原料制备加气混凝土制品的工业生产提供了依据。 其次，课题还进行了工艺条件的优化选取和验证。在铁尾矿砂最大加入量的情况下，通过分别研究静停养护温度、静停养护时间、蒸压养护时间三种工艺条件对制品强度的影响，从中优选出最优工艺条件为：静停养护温度60℃，，静停养护时间4h，蒸压养护时间9h。此时，加气混凝土砌块抗压强度为5.28MPa，绝干密度682.4kg/m3，符合国标A5.0，B07级加气混凝土的要求。 试验最后对加气混凝土进行了XRD分析，更好地从微观认清反应机理。 课题对铁尾矿制备加气混凝土研究有推动意义，对于我国铁尾矿的综合利用，土地资源的保护以及环境的可持续发展有重大的现实意义。
[Abstract]:In recent years, with the rapid development of China's economy, the demand for mineral resources has increased significantly, and the tailings emissions have been increasing year by year, which brings more and more serious environmental problems, and the comprehensive utilization of tailings has been paid more and more attention by more and more people. At the same time, the construction industry in China is booming, the demand for building materials is growing rapidly, and the limited use of clay brick in our country promotes the development of new building materials such as aerated concrete. In this paper, the preparation of aerated concrete from iron tailings is studied. Based on the orthogonal experimental design, the aerated concrete blocks with different raw materials were prepared and the compressive strength and dry density of the products were measured. The influence of various factors on the strength and density of the product is analyzed by means of range analysis, and the maximum addition amount of iron tailings is finally determined according to the requirements of the national standard. When the amount of iron tailings is 62, quicklime is 25, cement is 10, gypsum is 3, aluminum powder is 0.1 and water / material ratio is 0.65, the aerated concrete products can be prepared according to the requirements of A5.0 B07 grade aerated concrete. It is proved that it is feasible to prepare aerated concrete from iron tailings of Rangmaoshan iron mine, and it also provides a basis for the industrial production of aerated concrete products made from similar raw materials. Secondly, the process conditions are optimized and verified. In the case of the maximum addition of iron tailings, the effects of three technological conditions on the strength of the products were studied, such as the curing temperature of static stop, the curing time of static stop and the curing time of autoclaving. The optimum technological conditions are as follows: temperature 60 鈩

本文编号：2115524