in general, after the oil crop has been pressed, it needs to be refined before it can be eaten. The refined oil can be obtained by passing the oil through the oil pipeline into the refined oil equipment for impurities removal, degumming, decolorization and deodorization. What are the filtration and impurity removal methods for grease equipment? In general, after the oil crop has been pressed, it needs to be refined before it can be eaten. The refined oil can be obtained by passing the oil through the oil pipeline into the refined oil equipment for impurities removal, degumming, decolorization and deodorization. In addition to the first step of the refined oil process, the impurity removal method in the industry is relatively mature at present, and the filtration method is commonly used for impurity removal. The filtration methods include gravity sedimentation, centrifugal force filtration, plate frame or belt filtration. Here are some details for each of these three methods: