Alkali Fusion of Waste Perlite Dust to Synthesize Faujasite Zeolite Using a Rotary Kiln | |
T. Wajima and S. Onishi | |
In this study, we attempted to continuously treat waste perlite dust by alkali fusion using a rotary kiln, to synthesize faujasite zeolite. A mixture of perlite dust and sodium hydroxide (NaOH) powder with three different mixture ratios (by weight) of 1:0.5, 1:0.8, and 1:1 was charged into a rotary kiln, and heated at 380 °C or 450 °C for 30 min. The resultant fused material was then converted into faujasite, a zeolite product, by heating it at 80 °C for 12 h followed by shaking for 24 h in distilled water at room temperature. It was confirmed that sodium silicate was formed using the rotary kiln, and the dissolution of Si and Al in the fused dust increased with increasing NaOH addition near the exit of the kiln. Faujasite could be synthesized for all fused conditions, and ...[Read More]
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