Comparative study of high-pressure grinding rolls and conventional wet and dry grinding methods on the flotation of base-metal sulphides and platinum group minerals

CIM Journal, Vol. 3, No. 4, 2012

N. A. Chapman, N. J. Shackleton, and V. Malysiak Anglo Research, Crown Mines, South Africa C. T. O’Connor Centre for Minerals Research, University of Cape Town, Rondebosch, South Africa

 In this study, the effect of using conventional crushing and high-pressure grinding rolls (HPGR) in combination with dry or wet milling was investigated using a base-metal sulphide (BMS) sphalerite and a platinum group mineral (PGM) ore to determine how these processes affect the flotation performance. In sphalerite, irrespective of the crushing procedure (HPGR or conventional), dry milling resulted in the highest grades and recoveries of zinc, whereas in PGMs, similar treatment produced the poorest results. The results were investigated further by the effect of factors such as percentage liberation and particle size on the flotation results.