溶解與沈澱反應對碳酸鈣礦石填充床孔隙率與水力傳導係數變化之影響

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姓名

林怡君(Yii-jun Lin) 查詢紙本館藏

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應用地質研究所

論文名稱

溶解與沈澱反應對碳酸鈣礦石填充床孔隙率與水力傳導係數變化之影響
(Effect of Particle Size on Evolution of Porosity and Hydraulic Conductivity Induced by Dissolution and Precipitation in Packed bed of calcium carbonate minerals)

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摘要(中)

地下流體與多孔隙介質礦物顆粒間產生地球化學反應，伴隨著孔隙率與水力傳導係數變化，此現象在科學、工程與工業領域皆為重要之研究議題。本研究進行一系列批次表面反應實驗及管柱流動實驗，進而瞭解流體流經碳酸鈣產生溶解與沈澱反應對孔隙率與水力傳導係數之變化。利用鹽酸HCl(aq) 及硫酸H2SO4(aq) 兩種溶液作為地下流體以加速反應速率。以測壓計測量水位，記錄管柱兩邊壓力差以達西定律計算水力傳導係數；測量出流水中鈣離子與硫酸根離子之濃度，以便計算孔隙率變化。管柱流動實驗結束，將管柱之碳酸鈣礦石填充床取出，進一步進行碳酸鈣微觀型態與礦物組成分析。研究結果發現碳酸鈣之粒徑與溶解/沈澱彼此競爭以致孔隙率與水力傳導係數有震盪的情形；SEM觀測得知石膏沈澱皆於進流口，以上現象皆與理論相符。

摘要(英)

Investigation of chemical reactions between a fluid and the porous medium through which it flows, and of the subsequent changes in the medium porosity and hydraulic conductivity, is an area of interest for many scientific, industrial and engineering. Dissolution and precipitation are two of the most important processes affecting fluid chemistry, and they can significantly modify the physical and chemical properties of porous media. In this study, we investigate the effect of particle size of carbonate rock on temporal evolution of porosity and hydraulic conductivity induced by dissolution and precipitation by performing a series of laboratory surface reaction experiment and column flow experiment by injecting HCl/H2SO4. The temporal evolution of overall hydraulic conductivity is calculated by measurement of change in hydraulic head gradient and application of Darcy’s law. Variation in porosity is obtained by analyzing the effluent acid for Ca2+ and and invoking the law of mass balance. Furthermore, after each experiment, the column sample is retrieved and sectioned in order to study the micro-morphology and mineral composition. Results show that significant fluctuations in porosity and hydraulic conductivity occur due to competition between dissolution and precipitation. The patterns of fluctuations in porosity and hydraulic conductivity are influenced by particle size of calcium carbonate. SEM analysis shows that gypsum precipitates in the inlet of the column. These findings are in qualitative agreement with conceptual understanding of such phenomena.

關鍵字(中)

★ 水力傳導係數
★ 孔隙率
★ 沈澱反應
★ 溶解反應

關鍵字(英)

★ porosity
★ hydraulic conductivity
★ calcium carbonate
★ precipitation
★ dissolution

論文目次

摘要 i
Abstract ii
誌謝 iv
目錄 v
圖目錄 vii
表目錄 viii
第一章前言 1
1-1研究背景 1
1-2 研究目的 2
第二章文獻回顧 3
2-1孔隙率(porosity) 3
2-2水力傳導係數(hydraulic conductivity) 3
2-3地球化學反應對孔隙率與水力傳導 4
2-4溶解/沈澱反應改變孔隙率相關研究 5
2-4-1模式模擬 5
2-4-2實驗室實驗 6
第三章材料與研究方法 8
3-1研究架構與實驗流程 8
3-2 實驗設備及材料 10
3-2-1實驗設備 10
3-2-2 實驗材料 10
3-3實驗方法 11
3-3-1 孔隙介質碳酸鈣前處理 11
3-3-2 酸性溶液製備 11
3-3-3批次溶解反應試驗 13
3-3-4管柱流動實驗 15
3-4 分析方法 18
3-4-1鈣離子濃度- EDTA滴定 18
3-4-2硫酸根離子濃度-離子層析法 20
3-4-3 掃描式電子顯微鏡/元素能量分析儀 (Scanning Electron Microscopy/ Energy-Dispersive Spectrometer ，SEM/EDS) 21
第四章結果討論 22
4-1 批次溶解反應實驗結果 22
4-2管柱流動實驗 25
4-2-1溶解/沈澱導致孔隙率與水力傳導係數變化 25
4-2-2反應後硫酸根離子、鈣離子與pH值之變化 29
4-2-3小結 29
4-3碳酸鈣微觀變化之電子顯微鏡觀察及元素成分分析 33
第五章結論與建議 44
5-1結論 44
5-2建議 45
參考文獻 46

參考文獻

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指導教授

陳瑞昇(Jui-Sheng Chen)

審核日期

2009-7-24

推文