The 3NZX series pressure-feed three-product heavy-medium cyclone is a core separation equipment with mature technology and reliable performance in the field of coal washing. With its powerful processing capacity and efficient separation effect, it has been widely used in many coal preparation plants. The most significant technical feature of this equipment is the "pressure feeding" mode. In this mode, the premixed raw coal and heavy medium suspension are pumped tangentially and integrally into the first section of the cyclone through a constant pressure feed pump at a higher pressure. The strong inlet pressure is transformed into a high-speed rotating centrifugal force field inside the cyclone, which provides key power for high-precision sorting of fine-grained materials.