As the name implies, the solid-liquid separation centrifuge is designed to allow solid and liquid to be completely and effectively separated. It is usually installed at the next level of the mud desilter or mud cleaner and belongs to the last solid control of the solid control system. Equipment for the separation of suspensions with solid particle diameters ≥2 μm, and the treatment of slurries and liquids.
A solid-liquid separation centrifuge is a solid-liquid separation device capable of removing free liquid from the surface of separated solid particles. The solid particles separated by the centrifuge only contain the liquid that is adsorbed by itself, that is, the binding on the surface of the particles. Liquid, no other excess moisture.
The structure of the solid-liquid separation centrifuge consists of a conical roller, an auger inside the drum, and a transmission connecting the drum and the auger. The drum can be rotated at a high speed in the range of 1500-3500r/min. The solid-liquid separation is carried out in the drum. The overflow end is provided at the end of the drum head.
The screw conveyor in the drum is used to transport the liquid phase and the solid phase to both ends of the drum, and the transmission connects the drum and the screw conveyor so that the two rotate in the same direction and have a certain rotational speed difference. Under normal conditions, the speed ratio of solid-liquid separation centrifuge drums and conveyors is generally 35:1.
When the solid-liquid separation centrifuge works, the suspension to be processed enters the liquid chamber through the inlet tube and then enters the separation chamber through the liquid inlet. The suspension entering the separation chamber is accelerated by the rotation of the drum to form a cone-shaped liquid ring, the depth of which is determined by the height of the overflow opening on the end face of the drum. Under the action of centrifugal force, the solid particles in the suspension are thrown onto the rotating drum wall and settled down.
According to Stoke's law, large particles settle first, small particles finally settle, and very fine particles that cannot settle out are discharged from the overflow port with the liquid phase. The settled solid particles are continuously pushed by the conveyor to move toward the small end of the drum and are discharged from the bottom end of the small end. Due to the high-speed rotation of the drum, the drilling fluid ring in the separation chamber obtains a large centrifugal force, so that very fine solid particles can be separated and most of the free water adsorbed on the surface of the solid particles can be shaken off.