Conversion from iron slags to high function zeolites and their applications

最近，人们希望对铁渣进行额外的再利用，以开发回收工艺。本研究开发了利用铁炉渣制备高性能铝硅酸盐（FAU沸石、X、Y沸石和氟云母）的工艺。以水淬高炉矿渣为原料，经浓盐酸预处理制备硅胶。用稀盐酸预处理缓冷高炉渣，控制硅铝比，制备了铝硅凝胶。采用微波加热法快速进行酸处理。以NaAlO^2和NaOH溶液为原料，水热合成了硅铝比为1.3 ~ 9.5的FAU分子筛X型和Y型。这些X型和Y型沸石的产品显示出较大的比表面积，约为730 m^2 g，约为1000 m^2 g。875 m^2 g朗格缪尔吸附。与直接加热法相比，微波加热水热法是一种快速合成均匀、细粒度FAU沸石粉体的方法。在800 ~ 1000 ℃下，由铝硅凝胶、Al_2O_3、NaF、MgF_2和MgO的混合物经固相反应，得到了不同化学组成的钠氟金云母。所得氟云母结晶度高，形貌为薄片状，粒径均匀。这些材料从铁渣转化已被证实具有相同的和/或更高的能力相比，商业。

Recently additional reuses of iron slags have been desired to develop the recycling process. In this study, the conversion process from iron slags to some high-performance alumino-silicates having higher functions, i.e. FAU zeolites, X and Y, and fluoro-micas, were developed. Silica gel as the starting material was prepared from water quenched blast furnace slag by pretreated with concentrate hydrochloric acid. Alumino-silica gel controlling the Si/Al ratio was also prepeared slow cooled blast furnace slag by pretreated with dilute hydrochloric acid. The acid treatments were rapidly carried out by using microwave heating method. FAU zeolites, type X and Y, having Si/Al = 1.3 - 9.5 were synthesized hydrothermally from the mixture of the two gels, NaAlO^2 and NaOH solutions in satisfactory yields. These products of zeolite X and Y show large specific surface areas, ca.730 m^2 g and ca. 875 m^2 g of Langumuir adsorption, respectively. Hydrothermal treatment by microwave heating has revealed to be a rapid method for synthesizing a homogeneous and fine FAU zeolite powders, compared with a direct heating method. Sodium-fluorine phlogopites having various chemical compositions were also obtained from the mixture of the alumino-siica gel, Al_2O_3, NaF, MgF_2 and MgO by solid-state reactions at 800 - 1000*. The obtained fluoro-micas showed the high crystallinity, thin-platy morphology and homogeneous grain size. These materials converted from iron slags have been confirmed to have equal and/or highly abilities compared to the commercial ones.