Two pressure probes in the mixing chamber's lower/middle section are used to calculate the fluidised bed density. The RC uses the relative density of the fluidised bed between the two probes to determine the discharge rate of the highdensity solids via a single central underflow valve. The underflow contains highdensity particles, and is generally coarser than the feed.
The hammer mill design is very robust and is used in many appliions, from grain milling to heavy duty requirements such as rock crushing or waste grinding. Hammer mills are part of the impact mill family, which means that the milling effect is obtained thanks to the speed at which particles are impacted, here, by one or several rotors. 2.