Factors affecting the separation accuracy of heavy medium cyclones are divided into two types: those hard to change during production, like feed coal quality and cyclone structure, and adjustable ones, such as inlet pressure and slurry feed volume.
Feed Coal Quality：A heavy medium cyclone has a small volume with equal inlet and outlet flow rates. When raw coal density changes, especially with more high - density materials, the limited underflow discharge capacity pushes medium - density coal and heavy medium to the overflow, raising separation density and reducing overall efficiency.
Cyclone Structure：The cyclone diameter should suit processing capacity and centrifugal force needs. Oversize diameters waste resources. A longer cylindrical section helps within limits; a short one harms light - product quality. The underflow diameter relates to heavy - product proportion. Larger underflow reduces separation density and clean coal yield, and vice versa. The overflow diameter, proportional to the underflow, also affects separation density. The feed port's shape and size matter; extremes are bad for separation.
Suspension Stability：Maintaining heavy medium suspension quality and stability in the cyclone is crucial. Suspension concentration impacts sorting. Avoid coarse magnetite powder, keep some coal slime, and use stabilizers if needed.
Circulating Medium Volume：With a small volume and short residence time, a heavy medium cyclone needs a large amount of circulating medium to ensure the right liquid - solid ratio, which greatly affects sorting efficiency.
Inlet Pressure：The cyclone must generate enough centrifugal force to send heavy particles to the underflow. Higher pressure boosts fine - heavy - product recovery but increases suspension concentration, slurry flow, and actual separation density while shortening residence time.
