摘要
为探讨山西灵丘南岐铁矿选矿厂铁尾矿高附加值综合利用的新途径,以该铁尾矿为硅质材料,水泥和石灰为钙质材料制备了尾矿加气混凝土。研究了升温时间、恒温时间、恒温温度和降温时间等蒸压养护制度对尾矿加气混凝土力学性能的影响。结果表明:在升温时间为2 h,恒温时间为8 h,恒温温度为195℃(恒温压力为1.46MPa),降温时间为3 h情况下,获得了抗压强度为5.28 MPa,干密度为597 kg/m3的尾矿加气混凝土制品,其力学性能符合GB/T11968—2006中A3.5、B06级加气混凝土合格品的要求。XRD分析结果显示,尾矿加气混凝土制品中的主要水化产物为托贝莫来石和羟基水化硅酸钙,原尾矿中的石英、斜长石等依然存在于制成品中,以骨料的形式对尾矿加气混凝土制品的强度起着积极作用。
The autoclaved aerated concrete（AAC） were manufactured by using iron ore tailings as the siliceous materials and cement and lime as calcium materials in order to find a new way to efficiently and comprehensively utilize the iron ore rail- ings from Nanqi mill plant, Lingqiu in Shanxi province. Factors that affect on the mechanical properties of AAC, including heat- ing-up time, constant time, constant temperature, cooling time were studied. The results showed that AAC products with the compressive strength of 5.28 MPa and the dry density of 597 kg/m3 was achieved at conditions of 2 h heating up ,8 h constant temperature at 195 ℃ （ constant pressure 1.46 MPa） and 3 h cooling. The mechanical properties of AAC products well fit the level A3.5, B06 qualification requirements of GB/Tl1968-2006. XRD analysis showed that the main hydration products of AAC were tobermorite and hydroxyl hydrated calcium silicates. Quartz, plagioclase and other minerals from the iron railings still exist in the AAC products, and can greatly increase the strength of AAC products as aggregate.
出处
《金属矿山》
CAS
北大核心
2014年第1期172-176,共5页
Metal Mine
基金
国家高技术研究发展计划(863计划)项目(编号:2012AA062405)
关键词
铁尾矿
加气混凝土
蒸压养护制度
抗压强度
干密度
水化产物
托贝莫来石
羟基水化硅酸钙
Iron tailings, Aerated concrete, Autoclaved curing system, Compressive strength, Dry density, Hydration prod-ucts, Tobermorite, Hydroxyl hydrated calcium silicates
