Dw. Fuerstenau et al., The effect of ball size on the energy efficiency of hybrid high-pressure roll mill/ball mill grinding, POWD TECH, 105(1-3), 1999, pp. 199-204
To find ways to reduce energy consumption in comminution, dolomite was grou
nd in a hybrid grinding system, involving the operation of a laboratory-sca
le high-pressure roll mill and ball mill in series. The work presented here
has demonstrated the energy efficiency of the hybrid system can be increas
ed by reducing ball size, provided the roll mill product contains sufficien
t internal damage to allow for the use of the smaller balls. There is an op
timum range of energy partitioning between the high-pressure roll mill and
the ball mill in the hybrid system. The increased efficiency of hybrid grin
ding is related to the particle damage imparted by the roll mill, as eviden
ced by the increased breakage rates of high-pressure roll, mill product rel
ative to particles that had not been roll milled. (C) 1999 Elsevier Science
S.A. All rights reserved.