Patent ID: 6752338
Filing Date: 2004-06-22
Classification: B02C,G01N

Abstract:
A pilot plant SAG mill comprising:a cylindrical outer chamber having flanges at opposed ends, said cylindrical outer chamber having a diameter of 2.5-5.5 feet and a ratio of length to diameter in the range of greater than 1:1, said cylindrical outer chamber containing a removable grinding chamber in the form of a sleeve, longitudinal lifters and a diaphragm, said removable grinding chamber having a ratio of diameter to length in the range of 3:1 to 1:1 and containing a plurality of steel balls not exceeding 15% of the grinding chamber volume, said removable grinding chamber extending partly down the length of the cylindrical outer chamber and having said longitudinal lifters attached to the internal surface of the sleeve, said lifters being capable of lifting steel balls and ore located in the removable grinding chamber during rotation of the cylindrical chambers, said removable grinding chamber having means at one end for receiving particulate ore from a feed hopper and said diaphragm at the opposed end, said diaphragm having outlet ports therein for discharge of ground particulate ore into the cylindrical outer chamber, said cylindrical outer chamber having discharge ports for discharge of ground particulate from the SAG mill, and a means to rotate the cylindrical outer chamber about a longitudinal axis.