Synthesis of Zeolitic Material from Waste Sandstone Cake Using Alkali Fusion
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概要
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During quarrying of sandstone, waste sandstone cake is discharged as industrial waste. We attempted to convert the cake into zeolitic materials using the alkali fusion method. Waste sandstone cake is mainly composed of crystalline phases, which were difficult to dissolve into aqueous alkali solution. By alkali fusion, most of the crystalline phases were converted into soluble phases, and could be transformed into zeolite crystals, zeolite-X and hydroxysodalite. The cation exchange capacities (CECs) of the product was almost 2.3 mmol/g, which is about 30 times higher than that of waste cake, and is higher than that of commercial natural zeolite.
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