Rod mills were introduced in Germany during the 1870s. They were developed to further reduce ore from the secondary crusher prior to entering the ball mill. Rod mills were first used in a wet-grind rod mill-ball mill circuit. Rod mills started being used in the U.S. around 1910 and were soon recognized as efficient fie crushers. The installation of rod mills at Sudbury, Ontario marked the beginning of the end of the classic stamp mills, popular for making fine ore since ancient times. Better crushing technology has reduced the use of rod mills and many have been repurposed as ball mills.
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