combination continuous ball mill grinding of sand and lime
United States Patent Oct 5, 1981 (b) milling said tar sand slurry to liberate the bitumen from the tar sand. that the addition of hydrated lime and flocculant to the tailings enhances also to prevent sticking of the bitumen to the grinding mills. step or in one or more of the later steps or a combination thereof. such as a ball mill or rod mill.