31. This comprised a sequence of crushing machines and ball mills connected by conveyor belts in a steel-framed, asbestos-clad building. 32. SAG mills are essentially autogenous mills, but utilize grinding balls to aid in grinding like in a ball mill . 33. Ball mills are rather inefficient, and typically require 10 20 kW�h of electric power to make a tonne of rawmix.34. Boddington produced 10, 000 ounces less in the latest quarter following the failure of one of its primary ball mills . 35. The grinding action employs much greater stress on the material than in a ball mill , and is therefore more efficient. 36. Only after several days of grinding in a steel ball mill or stone polisher would you get some degradation, she said. 37. The ten head battery comprised a jaw crusher, ball mill , 10 head stamper, classifiers, amalgamation plates, 6-cell Kraut flotation machine, and drier. 38. The crushed material was fed to one of two grinding circuits ( A-circuit = 3 ball mills , B-circuit = single ball mill ). 39. One main reason to ball mill as opposed to other methods is because it presses sulfur and KNO 3 into the porous charcoal. 40. The crushed material was fed to one of two grinding circuits ( A-circuit = 3 ball mills, B-circuit = single ball mill ).
