Abstract: The shallow-bath heavy medium separator as a coarse coal washing equipment is nowadays widely used for raw coal deshaling operation. The separator is seen to operate for this application with a high energy consumption because of large medium circulation volume. Based on study result, a discharge rotor is fitted at the clean coal overflow port of the traditional separator. Following a comparison of the structural parameters of the traditional separator and the new-type separator, analysis is made of the effect of the addition of the discharge rotor on separating performance. The reduction of circulating medium volume is also calculated through analysis of variation of frequency of medium circulating pump. Study result shows the new-type separator can carry out automatic discharge of clean coal with reduced medium circulating volume and energy consumption.