【摘要】：多孔陶瓷膜在過濾脫除高溫廢氣中的細微顆粒方面發(fā)揮著重要作用,而支撐體是多孔陶瓷過濾膜制備與應(yīng)用的基礎(chǔ),其性能的優(yōu)劣直接影響著陶瓷膜性能的好壞。目前,國內(nèi)制備的陶瓷膜支撐體的性價比偏低,尚不能規(guī)�；瘧�(yīng)用。因此,本文選用價格便宜的燒結(jié)莫來石為主要原料研制支撐體。首先采用球磨的方式對莫來石顆粒進行整形處理。研究表明：在所設(shè)計的球磨方式下,莫來石顆粒表面的尖銳棱角被去除,且莫來石顆粒不會被過度破碎；利用整形后的莫來石顆粒制備支撐體能夠顯著提高支撐體的可重復(fù)性。其次設(shè)計了一種制備具有高孔隙貫通度的支撐體的工藝流程,即逐層包覆工藝流程。研究表明,與傳統(tǒng)的工藝流程相比,該工藝流程能夠顯著提高支撐體的顯氣孔率和孔隙貫通性。然后利用Al2O3-K2O-SiO2三元相圖設(shè)計了助燒結(jié)劑cfo cf能夠在1300℃熔融,熔融體能夠?qū)χ误w中的莫來石骨架顆粒浸潤,并在冷卻后將相鄰的骨架顆粒粘結(jié),實現(xiàn)莫來石顆粒在較低溫度下的連結(jié),制備出低成本和高孔隙貫通度支撐體。最后研究了木炭粉添加量、cf添加量、坯體成型壓力三個關(guān)鍵因素對支撐體性能的影響規(guī)律。當木炭粉添加量≤8%時,支撐體坯體可較好地成型；與不添加木炭粉的坯體相比,當木炭粉添加量為2%～8%時,烘干后坯體的常溫耐壓強度有明顯的提高；當木炭粉添加量8%時,坯體耐壓強度降低。支撐體的顯氣孔率隨著木炭粉添加量的增加而增加,其常溫耐壓強度隨之降低。木炭粉添加量從2%增至4%時,顯氣孔率和常溫耐壓強度的變化幅度較��；而木炭粉添加量從0增至2%以及從4%增至6%時,顯氣孔率和常溫耐壓強度的變化幅度均較大。支撐體的常溫耐壓強度隨著cf添加量的增加而增加,其顯氣孔率隨之減小。當cf添加量12.5%時,顯氣孔率和常溫耐壓強度隨cf添加量變化的影響較�。划攃f添加量12.5%時,顯氣孔率和常溫耐壓強度隨cf添加量變化的影響較大。坯體成型壓力≤60MPa時,支撐體坯體可較好地成型。坯體成型壓力越大,支撐體的常溫耐壓強度越大而顯氣孔率越小。通過正交實驗,確定了制備支撐體的成型壓力、cf添加量和木炭粉添加量等三個關(guān)鍵參數(shù)為：成型壓力40MPa, cf添加量10wt%,木炭粉添加量6wt%。
[Abstract]:Porous ceramic membrane plays an important role in the filtration and removal of fine particles in high-temperature waste gas. The support is the basis of preparation and application of porous ceramic membrane. The performance of porous ceramic membrane directly affects the performance of ceramic membrane. At present, the cost-performance ratio of ceramic membrane support prepared in China is low and cannot be applied on a large scale. Therefore, the cheap sintered mullite is used as the main raw material to develop the support. Firstly, mullite particles were treated by ball milling. The results show that the sharp edges on the surface of mullite particles are removed and mullite particles will not be excessively broken under the designed ball milling mode, and the repeatability of the brace can be significantly improved by using the modified mullite particles to prepare the support. Secondly, a process of preparing proppant with high porosity is designed, that is, layer by layer coating process. The results show that compared with the traditional technological process, this process can significantly improve the apparent porosity and pore permeability of the support. Then, using Al _ 2O _ 3-K _ 2O-SiO _ 2 ternary phase diagram, the sintering aid cfo CF can melt at 1300 鈩，

本文編號：2137782