In industrial production, especially in evaporation and crystallization systems, centrifuges serve as key solid-liquid separation equipment, responsible for separating crystalline salts from mother liquor. Their performance directly affects product quality and production efficiency. Recently, industry experts have systematically sorted out the classification system, application scenarios and selection principles of centrifuges to provide technical reference for relevant enterprises.
     According to the separation principle, centrifuges are mainly divided into two categories: filter centrifuges and sedimentation centrifuges. Filter centrifuges use centrifugal force as the driving force to retain solid particles through filter media such as screens to form filter cakes. They are suitable for suspensions with particle sizes ranging from 10um to several millimeters and solid contents of 5%~80%. Common models include three-legged, top-suspended, horizontal scraper discharge centrifuges, etc. Among them, the horizontal piston pusher centrifuge has become the mainstream choice for medium and large-scale evaporation systems due to its continuous operation and pulsating discharge characteristics. Sedimentation centrifuges do not require filter media and separate solid particles using the principle of centrifugal sedimentation. They are particularly suitable for difficult-to-separate materials containing organic substances and small particle sizes. Models such as screw discharge sedimentation centrifuges and disc separators perform well in low-concentration material processing.
     In terms of selection, operational methods and material properties must be prioritized. For dehydration scenarios, scraper or piston centrifuges can be selected for materials with high solid content and large particle size crystals; for clarification processes, screw discharge sedimentation centrifuges or tubular separators are preferred to handle fine particles below 10um; for concentration operations, hydrocyclones or disc nozzle discharge separators should be matched according to the solid-liquid density difference. In addition, indicators such as continuous/intermittent operation requirements, automatic/manual feeding methods, and discharge moisture content are also key bases for selection.
     Currently, common centrifuges in evaporation systems have achieved automation upgrades. Models such as mechanical discharge three-legged centrifuges and siphon scraper discharge centrifuges have improved separation efficiency while reducing crystal breakage rate, meeting the needs of refined production. With the development of industrial intelligence, the optimization of flow-through materials and the improvement of processing capacity of centrifuges will become important directions for technological innovation in the industry.

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