... dust removing system, magnetic separation, gravity separator to remove impurity.2. Shelling, debarking,delint,soften Second step of pretreatment, by using shucking machine to remove ... prepressing, there are about 18% resid in the cakes, the cakes will be sent to the solvent extraction plant, by the ... extraction plant, we can get the oil in the cakes. And the resid in the cake will less than 0.8%. ...