焚化底渣水洗前處理及應用之探討

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题名:	焚化底渣水洗前處理及應用之探討
作者:	李忠文;Zhong-Wen Li
贡献者:	土木工程研究所
关键词:	水洗;CLSM;底渣;CLSM;water-wash;Bottom ash
日期:	2004-07-06
上传时间:	2009-09-18 17:16:52 (UTC+8)
出版者:	國立中央大學圖書館
摘要:	焚化底渣再利用已成為未來的趨勢，然而因為底渣本身的特性，當其再利用於水泥製品時常造成緩凝或體積膨脹的問題，因此，必須加以前處理。本研究內容包括三部份：(1)建立水洗參數；(2) 比較基本性質及(3)資源化評估。試驗結果顯示，水洗前處理底渣可有效降低水溶性氯離子含量，水洗效率隨液固比增加而提高，且多次水洗比單一批次水洗效果佳。由基本性質試驗可知，水洗後底渣工程性質有明顯改善，例如降低吸水率、磨損率及有機物含量。CLSM配比試驗顯示，使用水洗後底渣所調配的CLSM可滿足一般型CLSM的要求，如要符合早強型CLSM的要求，必須添加摻料，由研究結果發現，添加矽酸鈉及氫氧化鈉對於縮短CLSM的凝結時間有極大的幫助。 Reutilizing the bottom ash has become the future trend. Due to the characteristics of the bottom ash, in the cement products making process, it often retards the cement setting or causes volume expansion. Therefore it is considered necessary to pre-treat bottom ash. The study includes three parts: (1) the establishment of the water-wash parameters; (2) comparison of fundamental properties, and (3) reuse assessment. The experiment resulted in the following conclusions. First, water-washing can reduce the amount of water soluble chlorine ion in the bottom ash. Secondly, water-wash efficiently increases with L/S ratio. Third, multi-stages water-wash is a better process than single batch one. Based on the fundamental property Testes, after processing water-washing, bottom ash has shown observable improvement on its engineering property, such as reduction of the absorption, the abrasion rate, and content of organic matter. The CLSM mixing design test had shown that the CLSM produced with water-washed bottom ash meets the standard of general-type CLSM. However, in order to meet the standard of early-strong-type CLSM, adding admixtures is considered necessary. In addition, the result of the study shows that adding sodium silicate and sodium hydroxide in the process, greatly shortens the setting time of CLSM.
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