The REO series rotary extractor is suitable for pre pressing leaching of high oil content materials and direct leaching of low oil content materials. Due to the use of stainless steel fixed grid plates instead of easily damaged and deformed false bottom structures, this equipment has the advantages of compact equipment, stable operation, low failure rate, and high leaching efficiency.
The leaching process and working principle of a rotary extractor
The extracted oil is fed into the material compartment through a closed auger. There is a section of oil filled with the entire shell of the closed dragon, forming a material seal to prevent solvent vapor from overflowing.
The rotating body is controlled by a continuously variable speed machine or a variable frequency speed control machine, which can flexibly adjust the speed of the leaching machine, thereby adjusting the leaching time. The transmission components can be either rack driven or double row roller chain driven. The material grid filled with oil rotates in a certain direction and is subjected to intermittent spraying of different concentrations of mixed oil pumped up by the circulation pump. That is, each material grid is sprayed through a spraying pipe for a certain period of time. After the sprayed mixed oil has penetrated, it is then transferred to the next spraying pipe for spraying. The spraying form adopts a "self spraying" high flow circulation spraying method, where the concentration of the mixed oil sprayed increases from thick to thin until it is finally sprayed with fresh solvent. When the amount of mixed oil sprayed in the rotary extractor is greater than the amount it has filtered through the material layer, a layer of mixed oil will accumulate on the surface of the material layer for a short period of time, and the oil material will be in a soaking state. The material grid is turned over to the spray position, and the accumulated solvent has infiltrated completely. At this point, the material layer is in a state of infiltration. The mixed oil that has filtered through the material layer is partially collected in the previous oil hopper, while some still returns to the crude oil hopper, causing the mixed oil to continuously flow forward. The concentration of mixed oil in each oil hopper shows a "ladder like" pattern, increasing in sequence. When the material grid is sequentially turned to the fresh solvent spray pipe, the oil in the leaching grid undergoes the last fresh solvent spray and drips dry, and then turns to the position of the discharge grid. Therefore, the oil is sprayed, dripped, sprayed, and dripped with mixed oil in the extractor. After several leaching cycles, it is finally sprayed and dripped with fresh solvent. The flow direction of the mixed oil and the flow direction of the oil material are in a countercurrent state.