台灣年產稻殼約30萬噸，稻殼可燃燒作為熱源，燃燒後的稻殼灰含有高量的二氧化矽，是很好的資源，然而在台灣稻殼灰多以掩埋處理，殊為可惜。本研究旨在開發稻殼灰的用途，萃取其中的二氧化矽來生產有經濟價值的A型沸石。
A型沸石擁有很高的陽離子交換及吸水能力，目前最大的用途就是作為洗衣粉添加劑及乾燥劑，它的陽離子交換能力也非常適合用來保護環境，如去除廢水中的有害陽離子，包括核廢水中的輻射性陽離子。
本研究分成三大部分，其一為萃取稻殼灰中的二氧化矽並建立其數學模型；其二為用稻殼灰萃取液為矽源合成A型沸石並進行中間及最終產品性質的鑑定，以了解合成過程中的變化；其三為以不同矽源（稻殼灰、TEOS與矽酸鈉）合成A型沸石並比較其差異。
本研究結合縮合模式、一階反應速率式及二階反應速率衰退式，成功的推導出一個可精準描述由稻殼灰萃取二氧化矽的數學模式，此模式可預測在不同溫度及不同萃取時間下的二氧化矽萃取率。
以稻殼灰為矽源合成的A型沸石其結晶度可達80 %。合成的過程可分為誘導期、過渡期及成長期，本研究成功的推導一個數學關係式，可預測在不同合成時間及溫度下的結晶度。
經研究發現，以稻殼灰萃取液合成的A型沸石，其吸水率與結晶度成直線正比關係，吸水速率及最大吸水量在相對濕度為49-64 %之間不受濕度的影響。結晶度為80 %的A型沸石其最大吸水量為21 %，乾燥的A型沸石在相對濕度49 %下，僅需40分鐘吸水量即達飽和。
另研究以TEOS與矽酸鈉為矽源合成A型沸石並與以稻殼灰萃取液所合成的A型沸石進行比較，得到的結晶度分別為81.7 %（稻殼灰）、78.6 %（矽酸鈉）及26.5 %（TEOS）。以稻殼灰合成的A型沸石中有約11.5 %的氧化物雜質，其它二個矽源的產品則無。以稻殼灰為矽源所合成的A型沸石，其陽離子交換能力略低於以矽酸鈉所合成者，但遠大於以TEOS合成的A型沸石。由稻殼灰合成的A型沸石，其粒徑較大，約為以矽酸鈉所合成者大約3倍。

Taiwan produces about 300,000 tons of rice husk per year. Rice husk can be burned to supply heat. The ash from the burning contains significant amount of silica which makes the ash a valuable resource. Nevertheless, resource is often wasted by burying in the field. The purpose of this research is to develop a way of utilizing the rice husk ash (RHA) by extracting the silica from it and used silica to synthesize type-A zeolite.
Type-A zeolite has the highest ion-exchange capability among zeolites, and is also remarkable in capability in absorbing moisture. The greatest applications of type A zeolite is to use as an additive in detergent and as a drying reagent. The cation-exchange capability of type-A zeolite makes it especially suitable to solve environmental problems, such as removing harmful cations, including radio active cations, from waste water.
The contents of this studied can be classified into three parts, namely extracting silica from RHA and building a mathematical model for it, utilizing the extracted silica to synthesize type-A zeolite and examining the process of the synthesis, and finally, comparing the differences among the zeolites synthesized from different silicon sources (RHA, sodium silicate, and TEOS).
An extraction model based on shrinking core, first order reaction and second order reactivity decay was developed. The model can precisely predict the fraction of silica in RHA extracted with respect to extraction time and temperature.
The maximum crystallinity of the zeolite synthesized from RHA was found to be 80%. The crystallization process could be divided into three periods, the induction, the transition, and the crystal growth periods. A mathematical model was developed to describe the relation between the crystallinity and synthesis time at varied temperature.
This study revealed that moisture absorbing capability of the RHA-zeolite increased linearly with the crystallinity of the zeolites. Under the condition of 49-64% relative humidity, the rate and maximum of moisture absorption was not affected by the moisture. The maximum amount of moisture a RHA-zeolite could absorbed was about 21% of the weight of the zeolite, and it took about 40 minutes to reach the maximum under 49% relative humidity.
Other than RHA, this investigation also used TEOS and sodium silicate to synthesize type-A zeolite. The resulting zeolites were compared. The crystallinity of the zeolites synthesized from varied silicon source was found to be 81.7% (RHA), 78.6% (sodium silicate) and 26.5% (TEOS). In addition, the RHA-zeolite was found to contain 11.5% impurities, while the other two zeolites had none. The ion-exchange capability of RHA-zeolite was about the same as that of sodium-silicate-zeolite, and was far greater than that of TEOS-zeolite. The size of the RHA-zeolite was found to be 2.3 nm which was about 3 times larger than that of sodium-silicate-zeolite.

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