黄金尾矿在干混砌筑砂浆和泡沫混凝土中的资源化应用

发布时间：2018-06-15 23:24

本文选题：黄金尾矿 + 资源化利用　；参考：《西安建筑科技大学》2017年硕士论文

【摘要】：黄金矿山开采、选矿过程中产生的大量尾矿多堆存于尾矿库中,不仅占用大量耕地,还存在渗漏、溃坝、环境污染等风险,而且需要投入大量资金进行建设和运行维护。因此,开展黄金尾矿资源化利用对矿山尾矿综合治理和生态环境保护均具有重要意义。本文旨在拓宽黄金尾矿的资源化利用范围,提高了利用率,并降低了生产成本。主要研究内容及结果如下:首先,本文对黄金尾矿的化学成分进行分析,结果表明,黄金尾矿中含有大量的SiO_2和CaO,一定量的Fe_2O_3、Al_2O_3、MgO。此外,黄金尾矿还具有碱含量低,比表面积大,粒度极细等特点,除颗粒级配外,其他性能均满足建设用砂的技术要求。其次,利用黄金尾矿取代部分水泥制备干混砌筑砂浆。结果表明,随着黄金尾矿取代水泥量的增大,砌筑砂浆的稠度和分层度均是先增加而后降低,而其抗压强度逐渐降低。当黄金尾矿取代量为20%时,可制得满足M5、M10、M20各项性能要求的砌筑砂浆。此外,还对黄金尾矿超量取代水泥制备砌筑砂浆进行了研究。结果表明,水泥用量不变时,随着黄金尾矿超掺系数增加,砌筑砂浆稠度及分层度变化不大,而其抗压强度是先降低而后增加。当黄金尾矿在M5、M20砌筑砂浆中的超掺系数为2.5,在M10砌筑砂浆中的超掺系数为2.0时,可制得满足各项性能要求的砌筑砂浆。第三,采用压缩空气物理发泡和涡轮搅拌混泡的方法,对黄金尾矿取代水泥量不同时配制的泡沫混凝土性能进行了研究。结果表明:当黄金尾矿取代硅酸盐水泥用量的15%时可以配制出满足强度和导热系数要求的干密度为A05级的泡沫混凝土,其28d抗压强度为1.4MPa,导热系数为0.119 W/(m·K)。最后,对资源化利用的思路以及地面轻质混凝土填充层取代材料的应用进行了阐述,就资源化利用过程中存在的难点及问题进行了思考,并对后续改进提出了见解。
[Abstract]:In gold mining, a large number of tailings produced in the process of mineral dressing are stored in the tailings reservoir, which not only occupy a large amount of cultivated land, but also have the risk of leakage, dam break and environmental pollution, and need to invest a lot of funds for construction and operation and maintenance. Therefore, the utilization of gold tailings is of great significance to the comprehensive control of mine tailings and the protection of ecological environment. The purpose of this paper is to widen the utilization range of gold tailings, improve the utilization ratio and reduce the production cost. The main contents and results are as follows: firstly, the chemical composition of gold tailings is analyzed in this paper. The results show that there are a lot of Sio _ 2 and Cao in the gold tailings, and a certain amount of Fe _ 2O _ 3 / Al _ 2O _ 2O _ 3 / MgO _ 3. In addition, the gold tailings also have the characteristics of low alkali content, large specific surface area and fine granularity, etc., except for grain gradation, other properties can meet the technical requirements of construction sand. Secondly, dry mixed masonry mortar is prepared by replacing some cement with gold tailings. The results show that the consistency and stratification of masonry mortar increase first and then decrease with the increase of the amount of cement replaced by gold tailings and the compressive strength decreases gradually. When the replacement amount of gold tailings is 20, masonry mortar can be made to meet the performance requirements of M _ 5 / M _ (10) / M _ (20). In addition, the preparation of masonry mortar by replacing cement with gold tailings was studied. The results show that the consistency and delamination of masonry mortar do not change with the increase of the overmixing coefficient of gold tailings when the cement content is constant, but the compressive strength decreases first and then increases. When the overmixing coefficient of gold tailings in M _ 5 / M _ 20 masonry mortar and M _ (10) masonry mortar is 2.5 and 2.0 respectively, the masonry mortar which meets the requirements of various properties can be obtained. Thirdly, the properties of foamed concrete prepared with different amount of gold tailing instead of cement are studied by means of compressed air physical foaming and turbine mixing. The results show that foamed concrete with dry density of A05 grade can be prepared when the amount of gold tailings replaces Portland cement. The 28d compressive strength is 1.4 MPA, and the thermal conductivity is 0.119 W / m K ~ (2 +). Finally, the ideas of resource utilization and the application of substitute material for ground lightweight concrete filling layer are expounded, the difficulties and problems in the process of resource utilization are considered, and some suggestions for further improvement are put forward.
【学位授予单位】：西安建筑科技大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TU528;TU578.1

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