發(fā)布時(shí)間：2018-05-12 03:08

  本文選題：高鋁粉煤灰 + 多孔陶瓷��； 參考：《合肥工業(yè)大學(xué)》2017年碩士論文

【摘要】：陶瓷膜管的結(jié)構(gòu)包含支撐體,過(guò)渡層和過(guò)濾層三個(gè)部分。本文以固體廢棄物高鋁粉煤灰為原料,使用添加造孔劑的方法制備高鋁粉煤灰陶瓷膜管支撐體,探究其中間過(guò)渡層陶瓷膜和過(guò)濾層陶瓷膜的涂覆和燒結(jié)工藝。使用一系列手段對(duì)高鋁粉煤灰多孔陶瓷的物相組成、抗彎強(qiáng)度、孔隙率、孔徑分布以及顯微形貌等方面進(jìn)行表征和測(cè)試,并使用Makipirtti-Meng經(jīng)驗(yàn)速率方程分析高鋁粉煤灰多孔陶瓷的燒結(jié)動(dòng)力學(xué)。高鋁粉煤灰多孔陶瓷膜管在過(guò)濾性能和機(jī)械強(qiáng)度方面與傳統(tǒng)的氧化鋁多孔陶瓷膜管相媲美,但是其制造成本大大降低,不僅可以解決令人頭疼的固體廢棄物環(huán)境污染問(wèn)題,還可以“以廢治廢”,具有較高的社會(huì)意義以及一定的經(jīng)濟(jì)價(jià)值。本文以高鋁粉煤灰為原料,淀粉和堿式碳酸鎂作為造孔劑,添加高分子粘結(jié)劑,分別在1200-1500℃燒結(jié)溫度下制備5組不同含量的多孔陶瓷樣品,并測(cè)試其孔隙率、收縮率、氣通量、水通量、抗折強(qiáng)度等性能。實(shí)驗(yàn)結(jié)果表明,燒結(jié)溫度和造孔劑的種類和含量對(duì)多孔陶瓷的性能影響顯著。堿式碳酸鎂造孔作用明顯優(yōu)于淀粉,且隨著造孔劑含量的增高,孔隙率,氣通量,水通量逐漸升高,抗折強(qiáng)度略有降低。隨著燒結(jié)溫度的升高,氣通量、水通量先增后減,在1350℃時(shí)達(dá)到最大值4854.24 m3m-2h-1bar-1、48.61 m3m-2h-1bar-1。綜合考慮,添加質(zhì)量分?jǐn)?shù)為20%的堿式碳酸鎂作為造孔劑,在1350℃溫度下燒結(jié)2h,制備得到的高鋁粉煤灰多孔陶瓷支撐體性能最佳。使用浸漬涂覆法在高鋁粉煤灰支撐體上涂覆粒徑為5μm的陶瓷粉體顆粒層,獲得平均孔徑為1.22μm的中間過(guò)渡層;涂覆粒徑為500nm的陶瓷粉體顆粒層獲得平均孔徑為0.45μm的過(guò)濾層陶瓷膜。通過(guò)對(duì)其力學(xué)性能、過(guò)濾性能以及顯微形貌的研究,探討得出:中間過(guò)渡層陶瓷膜在1400℃溫度時(shí)燒結(jié)2h,過(guò)濾層陶瓷膜在1000℃溫度時(shí)燒結(jié)2h得到的氧化鋁陶瓷膜具有較佳的機(jī)械性能,抗彎強(qiáng)度為8.31MPa,能夠滿足日常工作需求;同時(shí)它還具有良好的滲透性,其氣通量為2222.2m3m-2h-1bar-1,孔徑分布窄,過(guò)濾精度高。使用Makipirtti-Meng經(jīng)驗(yàn)速率方程分析處理高鋁粉煤灰多孔陶瓷樣品的階梯等溫收縮(SID)數(shù)據(jù),計(jì)算其燒結(jié)活化能。結(jié)果發(fā)現(xiàn),高鋁粉煤灰多孔陶瓷在燒結(jié)過(guò)程中只有一種燒結(jié)機(jī)制:1250-1400℃,其燒結(jié)活化能為679.28 kJ/mol。燒結(jié)機(jī)理可以理解為高鋁粉煤灰中的Al2O3和SiO2隨著溫度的升高逐漸轉(zhuǎn)變?yōu)槟獊?lái)石(3 Al2O3·2SiO2)的燒結(jié)過(guò)程。此外,該計(jì)算結(jié)果進(jìn)一步驗(yàn)證了陶瓷原料物相越復(fù)雜,雜質(zhì)越多,燒結(jié)活化能越高的規(guī)律。
[Abstract]:The structure of ceramic membrane tube consists of three parts: support, transition layer and filter layer. In this paper, the ceramic membrane tube support of high aluminum fly ash was prepared by adding pore-making agent to solid waste high alumina fly ash as raw material, and the coating and sintering process of the intermediate layer ceramic membrane and filter layer ceramic membrane were investigated. The phase composition, bending strength, porosity, pore size distribution and micromorphology of porous ceramics with high aluminum fly ash were characterized and measured by a series of methods. The sintering kinetics of high alumina fly ash porous ceramics was analyzed by Makipirtti-Meng empirical rate equation. High alumina fly ash porous ceramic membrane tube is comparable to the traditional alumina porous ceramic membrane tube in filtration performance and mechanical strength, but its manufacturing cost is greatly reduced, which can not only solve the problem of environmental pollution caused by solid waste. It also has high social significance and certain economic value. In this paper, five groups of porous ceramic samples with different contents were sintered at 1200-1500 鈩，

本文編號(hào)：1876841