Abstract：

Oil-coated particles are common pollutants in the non-ferrous metal processing industry, and are mainly removed using filtration methods. The high viscosity of oil-coated particles causes them to form a large liquid film on the surface of the filter material and easily harden, resulting in rapid increase in resistance and short service life of the filter material. This article conducts an optimization study on the filtration performance of oil-coated particles using glass fiber filter materials, and using impregnation method to prepare superoleophilic filter materials, analyses the changes in performance parameters such as operating pressure drop and filtration efficiency of the original filter material and the superoleophilic filter material, as well as the reasons for these changes. The results show that superoleophilic modification can significantly reduce the growth rate of pressure drop during the filtration process of the filter material, and its service life is increased by 60.76% compared to that of the original filter material. At the same time, the superoleophilic filter material has a small increase in filtration efficiency for small particles with a particle size range of 0.3-0.5 μm by about 3%. By observing the morphology characteristics of the filter material surface, the reasons for the reduction in resistance and the improvement in efficiency are that the superoleophilic filter material has a good affinity for the oil, and the oil phase is quickly transported to the interior of the filter material, and diffused and absorbed on the fibers, inhibiting the formation of liquid films on the surface and inside of the filter material. This study is of great significance for reducing the energy consumption due to filtration and labor costs caused by frequent replacement of filter materials in the non-ferrous metal processing industry.

Keywords:oil-coated particle; glass fiber; superoleophilic; surface modification; resistance reduction and efficiency enhancement