为了高附加值地利用铁尾矿,实验以铁尾矿、页岩和云母为基材并添加适量的长石和发泡剂,通过烧结的方法制备铁尾矿基多孔保温材料。采用TGA法分析云母和页岩掺量对粉料低共熔温度和烧成温度的影响,利用XRD、SEM研究云母和页岩比例的变化对铁尾矿基多孔保温材料矿物组成和形貌的影响。结果表明云母-页岩二元体系中云母含量的增加会降低试样的低共熔温度和烧成温度;页岩含量的增加能促使更多的石英参与反应生成斜长石,试样中斜长石的含量略有增加,石英则有所降低;试样内部含有大量分布均匀的气孔,最大孔的孔径约为2mm,在大气孔之间和内部存在许多小气孔。
In this paper,the sintered thermal insulation materials were fabricated by using iron tailings,shale,mica,feldspar and foaming agent.In order to study microstructural characteristics of porous thermal insulation materials containing iron tailings,thermal analysis of ingredients,XRD and SEM of samples were tested.The results showed that eutectic temperature and sintered temperature of samples fell with increasing of mica contents of ingredients,plagioclase contents of samples raised and quartz contents of samples decreased when shale contents of ingredients were increased that could promote the sintering reaction of plagioclase,lots of well-proportioned holes could be found in the sample,the diameter of holes are no more than 2mm,there are many pinholes among and in the large-size holes.
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