First, clean up. The germ recovered from corn grits is often mixed with corn flour and dander, which should be cleaned with a double-layer vibrating screen. Screen mesh, first layer 1.5 mesh, second layer 4 mesh. If there are still a lot of germ chips mixed under the sieve, a 5-mesh or 7-mesh sieve can be used to reduce bud loss. Germs recovered from corn starch production and radicle crumbs mixed with skin crumbs should be removed by continuous washing with clear water in shallow tanks or washing tanks.

Second, fuck. After washing, the recycled corn germ is easy to deteriorate and rancid because of its high moisture content. Therefore, it is necessary to dry or dry the washed corn germ until the moisture content is lower than 10%.

Third, roll the embryo. The dried corn germ is rolled into 0.3-0.4 mm flake embryo by an embryo roller, which destroys the cell structure and is convenient for steaming, frying and pressing.

Fourth, steaming and frying. Stir-fry the material embryo in a steaming and frying pan for 40-50 minutes until the material embryo gradually turns brownish red and can smell the fragrance, and then take it out of the pan immediately. Be careful not to smell burnt. At this time, the temperature of the blank is about 1 15- 120 degrees Celsius, and the water content is between 2% and 4%.

Fifth, squeeze. The material embryo after steaming and frying directly enters the screw oil press to extract oil. In operation, the initial feed is less. After the press runs normally, the feed is uniform and the oil and cake are discharged. When the oil press is running normally, its oil press speed is 8 revolutions per minute. The residence time of the blank in the pressing chamber is 2.5 minutes. The thickness of the slice to be treated is about 5-6 mm, and the oil yield is generally in the range of 22%-28%. The residual oil rate in the cake is 5%-6%. The extracted corn germ oil is commonly known as "crude oil" without refining. High quality corn germ oil can be obtained by hydration, alkali refining and deodorization of crude oil.