燃煤飛灰與玻璃廢棄物燒製輕質骨材之研究

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Title:	燃煤飛灰與玻璃廢棄物燒製輕質骨材之研究
Other Titles:	Preparation of lightweight aggregates withcoal fly ash and glass wastes
Authors:	鄭少翔 Cheng, Shao Hsiang
Contributors:	魏玉麟 Wei, Yulin 環境科學與工程學系
Keywords:	廢棄玻璃;微波消化;燃煤飛灰;助熔 waste glass;microwave digestion;coal fly ash;flux
Date:	2013
Issue Date:	2014-02-17T06:24:52Z (UTC)
Abstract:	本研究以微波消化燃煤飛灰，燃煤飛灰經微波消化後之消化液，以ICP-AES測定其中的成分。結果顯示，且隨著溫度上升Al、Ca及Fe所得之測值也隨之上升。本研究另將燃煤飛灰與廢棄玻璃混合後，製成「輕質骨材」。上述混合廢棄物經3000psi的壓力進行壓錠造粒後，置於高溫爐，在不同溫度燒製，自高溫爐取出後待冷卻，進行各種物理和化學特性的鑑定，藉以比較添加廢棄玻璃對於燃煤飛灰燒製成輕質骨材影響。此外，為了降低燒結溫度，本研究也將前述之混合物分別加入並另行添加助熔的碳酸、硫酸、鹽酸鹽類，以壓力3000psi造粒後，於不同燒製溫度燒製，藉以比較添加各種助熔鹽類對於燃煤飛灰燒製成輕質骨材影響。研究結果顯示，除純燃煤飛灰於1050 oC所燒製之骨材外，其餘各試體之顆粒密度皆符合輕質骨材規範<2 g cm-3。添加廢棄玻璃與各種助熔鹽類均能降低燃煤飛灰燒結成輕質骨材時所需的溫度，各種助熔鹽類於高溫時，因其分解或揮發而產生氣體，提供骨材膨脹發泡時所用。 This study digests coal fly ashes with microwave-assisted digestion under various temperatures. The compositions of coal fly ash are determined by ICP-AES. The results show that microwave digestion can improve significantly the analytical outcome. And Al, Ca, and Fe contents obtained increase when increasing temperature.This study also uses fly ash mixed with waste glass to make lightweight aggregate. The mixed wastes are formed into pellets with a pressure of 3000psi. They are fired for certain time at high temperatures, and removed from the furnace to cool. Physical and chemical properties of the aggregates are determined to compare the effect of added waste glass on firing coal fly ashes into lightweight aggregates.This study further adds flux of carbonates, sulfates, chloride salts to the mixtures to reduce sintering temperatures. Physical and chemical properties of the aggregates are determined to compare the effect of added salts on firing mixtures of coal fly ashes and waste glass into lightweight aggregates.The results show that except the aggregate made from pure coal fly ash fired at 1050oC, all the aggregates are in compliance with specifications of lightweight aggregate’s particle density <2 g cm-3. Addition of waste glass and flux salts can reduce the required temperature for sintering coal fly ash into lightweight aggregates. Flux salts either decompose or volatilize at high temperatures to produce gases that expand aggregates.
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