Hardinge 10' x 48" 

10′ x 48″ Hardinge Conical Ball Mill
– Used conical ball mill in excellent condition
– Bullgear in excellent condition
– Pinnion in excellent condition
– Induction motor G.E. 350 h.p.
– Metal liners 85%
– Bearings in very good condition
– Reduction gear G.E.

Harlow Hardinge noticed that rocks of different sizes move at different rates down an inclined surface. This observation led to his development of conical ball mills, wherein the grinding media organized from coarse to fine within the mill, creating grinding efficiencies previously unknown. Today, the term –Hardinge Mill” refers to any cylindroconical ball mill, made in sections with a flattish cone at feed end followed by a cylindrical drum, and finishing with a steep cone leading to the discharge trunnion. These –tricone mills” have wedge-shaped liners in the drum section that form a gentle conic frustrum widest at the feed end. Hardinge gained an important reputation in 1910 when the Calumet and Hecla copper mine in Michigan installed 64 of his open-circuit mills and experienced unprecedented rates of recovery.