Overcoming the challenges associated with achieving high uniformity and connectivity of pore channels in ceramic membranes, we designed silicon carbide ceramic membrane derived from the recrystallization process based on the Dinger-Funk equation of the closest -packing model with various grain grading. Furthermore, the effects of particle size distribution on the resulting microstructure and pore architecture of the ceramic membrane was also explored. The findings corroborated the critical importance of raw material particle size distribution in controlling pore size distribution and morphology. After sintering at 1900 degrees C, the silicon carbide ceramic membrane, benefiting from ideal particle packing, exhibited a remarkably uniform pore structure. Notably, the most probable pore size constituted over 70 %, while achieving an open porosity of 51.3 % even without the addition of pore -forming agents. The silicon carbide ceramic membrane also demonstrated exceptional hydrophilicity (water contact angle:-0 degrees), impressive water permeation (1210 L m-2 h-1 & sdot;bar- 1), coupled with efficient turbidity removal (-100 %) in carbon black wastewater treatment applications. Additionally, membrane regeneration proved effective using a dilute NaOH solution backwash, achieving a flux recovery efficiency of 98 %. This strategy had directive significance for designing high -performing silicon carbide ceramic membranes.

根据Furnas模型理论,研究了两种粒径颗粒的级配对SiC陶瓷膜孔径大小及其纯水通量的影响.研究结果表明,细颗粒含量≤40％时,随着细颗粒含量的增加,粗细颗粒之间形成的烧结颈增多,粗颗粒与粗颗粒之间的间隙减小,使得粗颗粒堆积形成的陶瓷膜骨架更加密实,SiC陶瓷膜的孔径减小;经1900℃烧结后,当细粗颗粒含量比例为4:6时SiC陶瓷膜的孔径较小,为0.699μm,能有效分离乳化油油水.

Abstract The silicon carbide (SiC) powder is covered with polycarbosilane (PCS), N-Methyl pyrrolidone (NMP) is a solvent, polyethersulfone (PES) is a bonding aid, using phase-phase and solid-phase sintering process combined with a step-by-step molding to prepare a symmetrical structure of silicon carbide hollow fibers, and determine the membrane’s perforation and purification and purity of the water distribution and the circumference of the membrane. The results show that the SiC membrane tube is a finger-hole structure layer-spongy structure layer-finger-hole structure structure, the optimal sintering temperature is at 1200 °C, the size of the prepared ceramic membrane aperture is concentrated in about 0.9 μm, and the pure water flux is 2.832m3 / (m2⋅h).

Two kinds of silicon carbide (SiC) powders with median diameters of 0.60μm and 2.04μm were selected as raw materials, and uniformly dispersed SiC coating film solutions were prepared through different particle grading. The effects of gradation ratio and dispersant tetramethylammonium hydroxide (TMAH) on the dispersibility and rheology of SiC coating films were studied, and the effect of dispersant content on the film forming properties of the slurry was discussed. When the fine powder and coarse powder grading mass ratio is 3:7, the particle size distribution of the mixed powder is closest to the theoretical distribution of the Dinger model. At this time, the slurry has good rheology and high particle bulk density. When 0.4% TMAH is added, the viscosity of the slurry is the lowest. When TMAH is added in an amount of 0.1 to 0.2%, the slurry has good film-forming properties.

The research and development of inorganic ceramic membrane were introduced,and preparation methods of inorganic ceramic membrane were discussed as well as their application in treatment of oily waste water,such as emulsion wastewater,oil field produced water,cleaning fluid,food industry oily wastewater and petrochemical oily wastewater.