2018 Volume 29 Issue 1_2 Pages 29-34
During the production of crushed stone, stone by-product, which is originated from various types of stone and is collected by some processes, is discharged as an industrial waste. In this study, we attempted to convert siliceous stone by-products into zeolitic material using alkali fusion. Eight different stone by-product samples discharged in Japan were used in this study, and faujasite-type zeolite can be synthesized from all samples using alkali fusion method. The crystallinities and cation exchange capacities of the product depend on the contents of Si and Al in chemical composition of raw by-product. Regardless of mineralogical composition of raw by-product, amorphous precursor was prepared from all samples using alkali fusion, and was crystalized into faujasite zeolite. The observed concentrations of Si and Al in the solution during the reaction explain the crystallization of the zeolite phase in the product. These results suggested that faujasite zeolite can be synthesized from various types of stone by-product using alkali fusion.
