廢玻璃製備二氧化硫吸收劑之研究

The Study of SO2 Sorbent Prepared from Recycled Glass

戴健洲(Chien-Chou Tai)

指導教授 ： 施信民

國立臺灣大學/工學院/化學工程學研究所/碩士(2004年)

https://doi.org/10.6342/NTU.2004.02318

摘要

本研究以廢玻璃容器粉碎後之玻璃粉與氫氧化鈣製備二氧化硫吸收劑，評估其用在乾式或半乾式煙道氣除硫法的可行性。吸收劑的製備方法是將固體原料與水混合漿化，再予以乾燥。研究探討玻璃/氫氧化鈣重量比(100/0-0/100)、漿化溫度(25-120℃)、漿化時間(0.42-32h) 、水/固重量比(5/1-20/1)、玻璃粒徑(4.3-37.2μm)與添加添加劑(氫氧化鈉和硫酸鈣)等製備條件對吸收劑化學組成、結構性質與反應性的影響。
玻璃/氫氧化鈣吸收劑因含有矽酸鈣水合物，其比表面積、孔隙體積及反應性較氫氧化鈣大。吸收劑的結構性質與反應性主要受玻璃/氫氧化鈣重量比的影響。吸收劑之鈣利用率隨重量比增加而增加，在配比為30/70時，吸收劑具有最大二氧化硫捕捉率(0.45 gSO2/g sorbent)。吸收劑反應性隨漿化溫度、時間與水/固比增加而增加，但在溫度90℃、時間8小時及水/固比10之後，其增加對吸收劑反應性的影響不大。玻璃粒徑越小製備所得吸收劑之反應性越高。添加氫氧化鈉會增進使用大粒徑玻璃或低玻璃含量之吸收劑的反應性。添加硫酸鈣會增加吸收劑之比表面積，但吸收劑的反應性並未隨著增高。
本研究的結果有助於廢玻璃容器的回收再利用與高效益新二氧化硫吸收劑的開發。

關鍵字

煙道氣除硫 ； 二氧化硫 ； 玻璃

並列摘要

Sorbents were prepared from recycled glass bottles and hydrated lime by slurrying the solids with water and subsequent drying. The reactivites toward SO2 of these sorbents were measured at conditions prevailing in dry or semidry flue-gas desulfurization processes.
Due to the formation of calcium silicate hydrate, the sorbents have greater specific surface areas and pore volumes, and are more reactive them Ca(OH)2 (HL). The structural properties and the reactivity of a sorbent were markedly affected by the glass/HL weight ratio.The utilization of Ca in a sorbent increased with increasing glass/HL ratio. The sorbent with a glass/HL ratio of 30/70 had the maximum SO2 capture (0.45 gSO2/g sorbent). The sorbent reactivity increased as slurrying temperature , time, and water/solid weight ratio increased and leveled off when they reached 90℃,8h,and 10/1,respectively. The sorbent reactivity increased when smaller glass particles were used. The addition of NaOH enhanced the sorbent reactivity for sorbents prepared with large glass particles or with low glass content . The addition of CaSO4．1/2H2O increased the specific surface area of the sorbnet, but did not increase the sorbent reactivity.
The results of this study may contribute to the preparation of new high-efficiency SO2 sorbents and the utilization of recycled glass bottles.

並列關鍵字

Glass ； Flue gas desulfurization ； Sulfur dioxide

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