4 in 1 aluminium dross recovery system, aluminium dross machine, dross cooling, ball mill and sieving machine. Get Price. Conical Ball Mills Benefits Advantages: Hardinge Mineral ... Dec 2, 2016 ... 1 Working Theory of the Hardinge Conical Ball Mill; 2 WORKING PRINCIPLE inside the Hardinge .... Lead Ores, Fuller's Earth, Aluminum Dross.