鞍山式铁尾矿制备耐盐碱建筑用砖的研究

发布时间：2018-04-23 12:43

本文选题：铁尾矿 + 建筑用砖　；参考：《华北理工大学》2017年硕士论文

【摘要】：铁尾矿是铁矿石选矿过程中所产生的固体废弃物,大量铁尾矿的堆积带来了巨大的环境问题与安全隐患,如何资源化利用铁尾矿一直以来都是全社会十分关注的问题。我国是世界上最大的建筑材料消费国,建材原料消耗巨大,且日渐面临资源匮乏的困境,资源化地利用铁尾矿生产建筑材料能够有效的解决上述问题。以鞍山式铁尾矿为研究对象,在系统研究其理化性质的基础上,开展耐盐碱建筑用砖制备技术研究。通过成型水分与水泥配比试验,确定成型水分为17.5%,水泥用量为12%。在粉煤灰与骨料用量试验中,发现粉煤灰的加入能够有效减弱硫酸盐与强碱的侵蚀作用,而骨料的添加能够显著提高铁尾矿砖的强度性能。通过外加剂试验研究,发现外加剂的适量添加不仅能够增强铁尾矿砖的强度,而且可以有效改善铁尾矿砖的耐硫酸盐与强碱侵蚀性能。综合试验结果表明,在铁尾矿、水泥、粗骨料与粉煤灰质量比为70:12:6:12、外加剂氯化钙用量为0.5%的条件下,可制得满足《非烧结垃圾尾矿砖》MU15性能要求的铁尾矿砖制品,且其具有良好的耐硫酸盐与强碱侵蚀性能。通过扫描电镜分析铁尾矿砖的抗盐碱侵蚀性能,结果表明,硫酸盐与强碱对铁尾矿砖的侵蚀表现为物理与化学的协同作用,其物理损害更快、更严重,物理损伤的同时进一步加速了化学腐蚀作用。利用鞍山式铁尾矿制备耐盐碱建筑用砖不仅可以实现铁尾矿的高效利用,节约国家资源,改善矿区环境,而且有利于提高沿海、盐碱地区以及工业厂区附近建筑材料的耐久性,符合我国现阶段新型墙体材料的发展需求。
[Abstract]:Iron tailings are solid wastes produced in the process of iron ore processing. The accumulation of a large number of iron tailings has brought huge environmental problems and safety risks. How to use iron tailings as a resource has always been a matter of great concern to the whole society. China is the world's largest consumer of building materials, building materials consumption is huge, and increasingly facing the plight of resource scarcity, the use of iron tailings to produce building materials can effectively solve the above problems. Taking Anshan iron tailings as the research object, based on the systematic study of the physical and chemical properties of Anshan iron tailings, the preparation technology of salt-resistant building bricks was studied. Through the test of the ratio of molding water and cement, it is determined that the molding water is divided into 17.5 and the cement content is 12. In the experiment of the amount of fly ash and aggregate, it is found that the addition of fly ash can effectively weaken the erosion effect of sulfate and strong alkali, while the addition of aggregate can significantly improve the strength performance of iron tailings brick. It is found that the proper addition of admixture can not only enhance the strength of iron tailings brick, but also improve the corrosion resistance of iron tailings brick to sulfate and alkali. The comprehensive test results show that when the mass ratio of iron tailings, cement, coarse aggregate and fly ash is 70: 12: 6: 12, and the dosage of additive calcium chloride is 0.5%, the iron tailings brick products which meet the performance requirements of "non-sintered garbage tailings brick > MU15" can be prepared. And it has good resistance to sulfate and strong alkali erosion. The corrosion resistance of iron tailings brick is analyzed by SEM. The results show that the corrosion of iron tailings brick caused by sulfate and strong alkali is a synergistic action of physics and chemistry, and the physical damage is faster and more serious. Physical damage further accelerates the chemical corrosion at the same time. The use of Anshan iron tailings for building bricks can not only realize the efficient utilization of iron tailings, save national resources and improve the environment of mining areas, but also improve the durability of building materials in coastal, saline-alkali areas and industrial factory areas. In line with the development needs of new wall materials at the present stage of our country.
【学位授予单位】：华北理工大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TD926.4;TU522.1

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