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During quarrying, waste stone cake is discharged as industrial waste, and in Japan the amount of cake amounts annually to 50 millions tons. To promote waste recycling, we attempted to convert waste sandstone cake into zeolitic material using alkali fusion. However, calcium causes the synthesis of an undesirable zeolite by interfering in the synthesis of a high functional zeolite. As a means to inhibit...
A zeolitic adsorbent was synthesized from powdered waste porcelain kept at 80 °C for 24 h. The product contained the zeolite phases Na-P1 and hydroxysodalite. The product with the highest cation exchange capacity (CEC) was synthesized using 4 M NaOH and the sample weight / volume of alkali solution ratio was 1/4. The highest CEC obtained for the product was almost 1900 mmol/kg, which is the same as...
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