Decanter centrifuge crystallization separation

The application of horizontal screw centrifuge in the field of crystallization separation mainly utilizes its powerful centrifugal force to achieve solid-liquid separation, especially for efficient and continuous solid-liquid separation of suspensions containing crystal particles. The following are the general working principles, characteristics and application scenarios of horizontal screw centrifuges in the process of crystallization separation: Working principle of horizontal screw centrifuge crystallization separation: 1. Feeding and acceleration: The suspension containing crystal particles enters the drum of the horizontal screw centrifuge through the feed port. The drum rotates at high speed driven by the motor, generating a strong centrifugal force, which causes the solid and liquid phases in the suspension to begin to separate. 2. Centrifugal sedimentation: Under the action of centrifugal force, the heavier crystal particles quickly settle to the inner wall of the drum to form a solid phase layer (crystal layer). At the same time, the lighter mother liquor (containing a small amount of uncrystallized substances and dissolved solutes) is pushed to the center of the drum to form a liquid phase layer. 3. Screw push: A screw conveyor coaxial with the drum and with a slightly lower speed than the drum is installed inside the drum. When the spiral blade rotates, on the one hand, it exerts an axial driving force on the solid phase layer, so that the crystal particles move along the inner wall of the drum to the discharge end; on the other hand, through the gap with the inner wall of the drum, it pushes the liquid phase layer to the overflow port at the large end of the drum to achieve solid-liquid separation. 4. Solid-liquid separation and discharge: With the continuous advancement of the spiral blade, the crystal particles are further dehydrated in the cone section of the drum and finally discharged from the discharge port. The separated mother liquor flows out through the overflow port and enters the subsequent treatment or recovery system. 5. Continuous operation: The horizontal screw centrifuge can realize continuous feeding, continuous separation, and continuous discharge. The whole process does not need to be interrupted. It is particularly suitable for large-scale and continuous crystallization separation operations. Features of crystallization separation of horizontal screw centrifuge: - Efficient separation: The centrifugal force is much greater than the gravity, and can achieve rapid and efficient separation of solid and liquid in a short time, especially suitable for occasions where the density difference between crystal particles and mother liquor is small. - Continuous operation: The design of continuous feeding, continuous separation, and continuous discharge ensures processing efficiency and production capacity, and is suitable for large-scale industrial production. - Strong adaptability: By adjusting parameters such as drum speed, spiral differential speed, and feed speed, it can adapt to crystal suspensions of different properties and different solid-liquid ratios, and achieve flexible adjustment and optimization of separation effects. - Automatic control: Modern horizontal screw centrifuges are usually equipped with automatic control systems that can monitor and adjust operating parameters in real time to ensure stable operation of the equipment and reduce the need for manual intervention. Application scenarios for crystallization separation of horizontal screw centrifuges: Horizontal screw centrifuges are widely used in the field of crystallization separation, including but not limited to the following industries: - Chemical industry: In the crystallization process of chemical products (such as ammonium sulfate, sodium chloride, zinc sulfate, oxalic acid, citric acid, etc.), it is used to separate crystals from mother liquor to improve crystal purity and yield. - Pharmaceutical industry: In the process of drug synthesis and purification, the solution containing drug crystals is separated into solid and liquid to ensure the quality and yield of drug products. - Food industry: In the crystallization process of salt and sugars (such as sucrose, glucose, fructose, etc.), it is used to separate crystals from mother liquor to improve the quality and utilization rate of food raw materials. - Metallurgical industry: In the crystallization and purification process of metal salts (such as copper sulfate, nickel sulfate, zinc sulfate, etc.), it is used to separate crystals from mother liquor to improve the purity of metal products. - Environmental protection field: In the wastewater treatment process, solid-liquid separation is performed on wastewater containing crystalline substances to achieve resource recovery and wastewater discharge in compliance with standards. In short, the horizontal screw centrifuge plays an important role in the field of crystal separation with its efficient separation ability, continuous operation mode and good adaptability, and has become a key equipment for many industries to achieve efficient separation and purification of crystal products.