A vertical fluidized bed jet mill is a type of fluidized bed jet mill that uses a vertical grinding chamber to grind and classify particles. It works by introducing pressurized gas or air into the grinding chamber, which creates a high-velocity stream of particles that collide with each other and with the walls of the chamber. The particles are then separated and classified based on their size and density using an air classifier. Vertical fluidized bed jet mills are commonly used in industries such as pharmaceuticals, chemicals, and food processing to produce fine powders with precise particle size distributions.