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研究生：	林雨謙 Lin, Yu-Chien
論文名稱：	燃煤底灰添加碳酸鈉-碳酸鈣轉化微晶玻璃之非等溫法結晶動力學研究 Non-isothermal crystallization kinetics studies on glass ceramics transformed from coal bottom ash with CaCO3-Na2CO3 additives
指導教授：	黃紀嚴 Huang, Chi-Yen
學位類別：	碩士 Master
系所名稱：	工學院 - 資源工程學系 Department of Resources Engineering
論文出版年：	2008
畢業學年度：	96
語文別：	中文
論文頁數：	54
中文關鍵詞：	動力學、非等溫法、碳酸鈣、碳酸鈉、微晶玻璃、片狀晶、底灰
外文關鍵詞：	kinetics, non-isothermal method, glass ceramics, bottom ash
相關次數：	點閱：131 下載：3
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台灣地區電力供應除核能發電廠以外，最主要的就是火力發電廠及天然氣，而台灣每年燃煤發電所產生的煤灰高達200萬噸，分別為80%的飛灰和20%的底灰。為了減少煤灰對環境的衝擊，各界持續對煤灰展開研究，經過十多年努力，飛灰的利用已經有相當成效，然而底灰的處理仍然是以堆置在灰塘為主，長期下來將產生空間不足的問題。故底灰資源化再利用已經是當今重要的課題。
底灰中豐富的化學元素正是製造玻璃的主要原料，故本研究以底灰為原料，加入玻璃修飾劑(15wt%CaCO3, 10wt%Na2CO3)後以熔融法製成玻璃，以DTA分析後得知玻璃轉移溫度約在801℃，而軟化點則在832℃出現，且1200℃以前只出現一放熱峰約在931℃。用XRD分析熱處理過的微晶玻璃，皆為鈣長石相(Anorthite)，但在各溫度時組成稍異。
用DTA所得資料配合NETZSCH - TA4此套軟體求出結晶分率χ，作出不同升溫速率(5, 10, 15, 20, 25℃/min)的結晶分率分佈圖配合K.Matusita所推導非晶質材料活化能與動力學參數的方程式求出本研究的反應階數n=3，晶體成長維度m=2。將求得的動力學參數值代入Marotta與Kissinger的方程式，求得活化能分別為524.5kJ/mol與378.3kJ/mol。比較後發現非晶質材料的結晶與熱處理機制，對活化能推算是不宜忽略。
晶體成長維度m=2涵意為片狀。在SEM觀察微晶玻璃截面與表面求證，顯示確實有片狀晶的生成，亦符合實驗計算的結果。用光學顯微鏡觀察發現微晶玻璃截面，發現微晶玻璃較原玻璃緻密，而孔隙率上升，推測是由於淬冷操作過程與燒結過程體積收縮以致內部出現孔洞。

The major electric power supply is thermal power plant in Taiwan, instead of nuclear power plant. It is estimated that above 2,000,000 tons of coal ash was produced annually in Taiwan, the other fly ash of 80% and another bottom ash of 20%. Coal ash has been investigated continuously in the world in order to reduce effect of coal ash on environment. Reuse of fly ash has rather fruitage in ten years, treatment of bottom ash is restricted in landfill, lack of place is produced in the further. Therefore, resource recycle of the bottom ash has become an urgent subject recently.
The chemical composition of bottom ashes are the same with the raw materials of glasses. The research used bottom ashes as materials to produce glass by melt after adding network modifier (15wt%CaCO3, 10wt%Na2CO3). Base on Differential Thermal Analysis, the glass transition temperature is 801℃ and the softing point appears in 832℃. There is a crystallization exothermic peaks in 931℃ before 1200℃. After heat treated on the glass and analyzed by X-ray diffraction, the crystal phase is anorthite, but has different composition in several temperatures.
Representative DTA thermographs taken at different heating rates can get the volume fraction of crystallites, χ. This study find that the mean value of the kinetic exponent, n, is three and the growth mechanism of crystal particles, m, is two using the equation derived by K. Matusita. From the kinetic exponent, the activation energies of crystallization were caculated to be 524.5kJ mol-1 for Marotta`s equation and 378.3kJ mol-1 for Kissinger`s equation. It shows that the activation energies have deviation without considering the crystallization and heat treated mechanism.
The growth mechanism of crystal particles is two, so the crystal habit is tabular. The surface and cross-section of the glass ceramic show the tabular crystal`s growth by scanning electron microscopy, and the calculation was proved by this. The cross-section of the glass ceramic by optical microscopy shows that it is denser and more porous than the initial glass.

第一章	續論............................................................................... 1
           1.1研究背景....................................................................... 1
           1.2研究目的....................................................................... 2
           1.3前人研究....................................................................... 3
       第二章 理論基礎....................................................................... 5
           2.1底灰性質及利用............................................................ 5
               2.1.1底灰的來源與性質............................................. 5
               2.1.2國內外底灰利用概況......................................... 6
           2.2微晶玻璃........................................................................ 7
               2.2.1微晶玻璃簡介..................................................... 7
               2.2.2玻璃的製造......................................................... 9
               2.2.3微晶玻璃的製造............................................... 11
               2.2.4成核劑............................................................... 12
       2.3結晶化過程.................................................................. 13
               2.3.1成核作用........................................................... 13
               2.3.2結晶熱處理....................................................... 14
           2.4結晶機構、活化能與動力學參數.............................. 16
               2.4.1結晶活化能計算............................................... 16
               2.4.2非晶質(Amorphous)材料的活化能計算......... 18
               2.4.3結晶分率(χ) ..................................................... 19
               2.4.4晶體成長維度的意義...................................... 19
       第三章 實驗方法與步驟......................................................... 21
           3.1實驗材料...................................................................... 21
           3.2實驗流程...................................................................... 21
           3.3性質分析...................................................................... 23
               3.3.1底灰化學成分分析........................................... 23
               3.3.2熱差分析法(DTA) ........................................... 23
               3.3.3 X-Ray繞射分析儀........................................... 23
               3.3.4顯微結構分析(SEM) ....................................... 24
               3.3.5基本物理性質量測........................................... 24
               3.3.6光學顯微鏡(OM) ............................................. 25
       第四章 結果與討論................................................................. 26
           4.1底灰化學成分分析...................................................... 26
           4.2熱差分析...................................................................... 27
           4.3結晶相分析.................................................................. 30
           4.4活化能與動力學參數計算.......................................... 33
           4.5顯微結構分析……….................................................. 38
               4.5.1表面結構分析(SEM)........................................ 38
               4.5.2截面結構分析(SEM)........................................ 39
           4.6基本物理性質測試...................................................... 45
           4.7光學顯微鏡結構分析.................................................. 45
       第五章 結論與建議................................................................. 49
           5.1結論.............................................................................. 49
           5.2建議.............................................................................. 50
       參考文獻................................................................................... 53
                                    

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校內：2011-08-20公開
校外：2013-08-20公開

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