莫来石质气—固分离多孔陶瓷膜支撑体的研制
发布时间：2018-07-22 14:36
【摘要】：多孔陶瓷膜在过滤脱除高温废气中的细微颗粒方面发挥着重要作用,而支撑体是多孔陶瓷过滤膜制备与应用的基础,其性能的优劣直接影响着陶瓷膜性能的好坏。目前,国内制备的陶瓷膜支撑体的性价比偏低,尚不能规模化应用。因此,本文选用价格便宜的烧结莫来石为主要原料研制支撑体。首先采用球磨的方式对莫来石颗粒进行整形处理。研究表明：在所设计的球磨方式下,莫来石颗粒表面的尖锐棱角被去除,且莫来石颗粒不会被过度破碎；利用整形后的莫来石颗粒制备支撑体能够显著提高支撑体的可重复性。其次设计了一种制备具有高孔隙贯通度的支撑体的工艺流程,即逐层包覆工艺流程。研究表明,与传统的工艺流程相比,该工艺流程能够显著提高支撑体的显气孔率和孔隙贯通性。然后利用Al2O3-K2O-SiO2三元相图设计了助烧结剂cfo cf能够在1300℃熔融,熔融体能够对支撑体中的莫来石骨架颗粒浸润,并在冷却后将相邻的骨架颗粒粘结,实现莫来石颗粒在较低温度下的连结,制备出低成本和高孔隙贯通度支撑体。最后研究了木炭粉添加量、cf添加量、坯体成型压力三个关键因素对支撑体性能的影响规律。当木炭粉添加量≤8%时,支撑体坯体可较好地成型；与不添加木炭粉的坯体相比,当木炭粉添加量为2%～8%时,烘干后坯体的常温耐压强度有明显的提高；当木炭粉添加量8%时,坯体耐压强度降低。支撑体的显气孔率随着木炭粉添加量的增加而增加,其常温耐压强度随之降低。木炭粉添加量从2%增至4%时,显气孔率和常温耐压强度的变化幅度较小；而木炭粉添加量从0增至2%以及从4%增至6%时,显气孔率和常温耐压强度的变化幅度均较大。支撑体的常温耐压强度随着cf添加量的增加而增加,其显气孔率随之减小。当cf添加量12.5%时,显气孔率和常温耐压强度随cf添加量变化的影响较小；当cf添加量12.5%时,显气孔率和常温耐压强度随cf添加量变化的影响较大。坯体成型压力≤60MPa时,支撑体坯体可较好地成型。坯体成型压力越大,支撑体的常温耐压强度越大而显气孔率越小。通过正交实验,确定了制备支撑体的成型压力、cf添加量和木炭粉添加量等三个关键参数为：成型压力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，
本文编号：2137782
[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，
本文编号：2137782
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