2016-1-11 · Quarry Academy 2005 Reduction Ratio (3) P 80 Feed: 400 mm P 80 Products: 16 mm Min. required plant reduction ratio: 2-stage Impact Plant: 10x7=70 OK, Only for Ai <0.15 2-stage Jaw/cone Plant 3x4=12 NOT OK 3- stage Jaw/cone Plant 3x3x4=36 OK Using reduction ratio to predict required no. of crushing stages 25 16 400 =