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金属矿山 ›› 2013, Vol. 42 ›› Issue (04): 155-158+163.

• 综合利用 • 上一篇    下一篇

用南岐铁尾矿制备加气混凝土

李德忠1,倪文1,郑永超2,陈伟1   

  1. 1.北京科技大学土木与环境工程学院;2.固废资源化利用与节能建材国家重点实验室
  • 出版日期:2013-04-15 发布日期:2013-05-13
  • 基金资助:

    * 国家高技术研究发展计划(863计划)项目(编号:2012AA062405)。

Preparation of Autoclaved Aerated Concrete made by Iron Ore Tailings in Nanqi Iron Mine

Li Dezhong1,Ni Wen1,Zheng Yongchao2,Chen Wei1   

  1. 1.School of Civil and Environmental Engineering, University of Science and Technology Beijing;2.State Key Laboratory of Solid Waste Reuse for Building Materials
  • Online:2013-04-15 Published:2013-05-13

摘要: 以山西灵丘县南岐铁矿尾矿为硅质材料、水泥和石灰为钙质材料制备尾矿加气混凝土,着重通过正交试验对尾矿加气混凝土制品的配方进行了优化,并借助XRD、SEM等测试方法对制品的矿物组成和微观结构进行了分析。结果表明:按照铁尾矿质量分数为61%、水泥质量分数为10%、石灰质量分数为23%、石膏质量分数为6%、铝粉与4种原料的质量比为0.55‰、水料比为0.57%的优化配方,制备出的尾矿加气混凝土制品的抗压强度为4.83 MPa、干密度为596 kg/m3,达到A3.5、B06级加气混凝土合格品要求;制品中的主要水化产物为托贝莫来石和CSH凝胶,此外还有石膏和尾矿中残留的石英等。

关键词: 铁尾矿, 加气混凝土, 抗压强度, 托贝莫来石

Abstract: The autoclaved aerated concrete(AAC) was prepared with iron ore tailings(IOTs) from Nanqi Iron Mine of Shanxi Lingqiu County as siliceous materials, cement and lime as calcium materials.The formulations of AAC were optimized by the orthogonal tests, and the products prepared are analyzed from its mineral composition and microstructure with XRD and SEM.The results showed that under the optimal formulations of the mass fractions of iron tailings, cement, lime and gypsum at 61%, 10%, 23% and 6% respectively, the mass ratio of aluminum powder to 4 kinds of raw materials at 0.55 ‰, and the water to materials ratio at 0.57%, the autoclaved aerated concrete with the compressive strength and the bulk density of 4.83 MPa and 596 kg/m3 was produced, which met the requirement of A3.5 and B06 level qualified product.The major phases in the AAC product are tobermorite, CSH gels, and also some gypsum and residual quartz from tailings.

Key words: Iron ore tailings, Autoclaved aerated concrete, Compressive strength, Tobermorite