利用礦物碳酸化法探討不同地區蛇紋石之二氧化碳封存能力

Sequestration of carbon dioxide by different sepentines with mineral carbonation

黃裕峯(Yu-Fong Huang)

指導教授 ： 許正一

國立屏東科技大學/工學院/環境工程與科學系所/碩士(2013年)

https://doi.org/10.6346/NPUST.2013.00139

摘要

CO2封存技術中，有油槽及天然氣封存、海洋封存、礦物碳酸化等方式。因礦物碳酸化的方式為目前最安全且穩定方法，且礦物蘊藏量豐富，所以本研究將以礦物碳酸化方式做為封存二氧化碳之方法。本研究擬針對不同地區之蛇紋石，進行礦物碳酸化之試驗，主要目的為1.固定大氣中二氧化碳 2.比較不同地區蛇紋石之二氧化碳封存能力3.利用不同反應溫度、時間及溶劑，觀察及比較碳酸化能力。
蛇紋石碳酸化後所產生碳酸鎂的量可能過低，導致以XRD不易判識，而1M鹽酸處理之水淬爐石在碳酸鎂2theta =30.90及41.92的波峰則有上升的現象。NEXAFS觀察碳元素，在能量強度290 eV為碳酸，可看出碳酸化後之碳酸有明顯增加。由TGA計算得知其碳轉換率，玉里蛇紋石碳轉換率為最高，達21.90%，其次是豐田蛇紋石18.13%，而後分別是瑞穗蛇紋石14.91%以及鎂肥12.43%，最低轉換率則是萬榮蛇紋石，只有4.34%。水淬爐石在1M HCl-75℃的反應條件下，碳轉換率可高達51.30%。比較HCl與去離子水兩種不同溶劑，得知以HCl當溶劑比去離子水當溶劑的效果要好。但提高HCl濃度對碳轉換率的影響不大，可以試著嘗試以更高的溫度進行相關探討。

關鍵字

二氧化碳封存 ； 礦物碳酸化 ； 蛇紋石

並列摘要

CO2 capture technologies, it is sealed up for oil groove and natural gas trough, seal up for safekeeping in the ocean, the mineral sequestration. Mineral carbonation is the safest and stable methods. The reserves of mineral are abundant, so this study will use the way of mineral carbonation as CO2 sequestration method. The study will do different regions of the serpentine for mineral carbonation, the purpose is 1. To fix CO2 in the atmosphere. 2. Comparison CO2 sequestration of serpentine in different regions. 3. Using different reaction temperature, time and solvents to compare carbonation.
The peak of XRD no clear change during carbonation. The Mg carbonate is too to be identified by XRD. However, the peaks 30.90o and 41.92 o is Mg carbonate, particularly for the slag sample. The energy at 290 eV with NEXAFS revealed the carbonate group. The carbon conversion rate is calculated by TGA. Yuli has the highest conversion rate 21.90%, followed by Fengtina 18.13%, than Rueisuei 14.91% and magnesium 12.43%, the lowest conversion rate is Wanrong 4.34%. Slag sample can achieve 51.30% at 1M HCl-75℃condition. The result with HCl has batter than deionized water in the different solvent, but increased HCl concentration on carbonate only some affect, it can try to explore the higher temperature later.

並列關鍵字

Carbon dioxide sequestration ； Mineral carbonation ； serpentine

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