Influence of charge type on measurements with an in-mill sensor

► Data for a series of pebble grinding test in a 1.4 m diameter pilot mill. ► Pebble fraction and proportion of magnetite pebbles in pebble feed are varied. ► Advantageous to keep the magnetite pebbles proportion as high as possible. ► This gives higher fines production and grindability but higher pebbles consumption. ► Best pebble fraction is 10-35 mm, lowest pebbles consumption - highest grindability.