— Dry permanent roll magnetic separators are widely used to remove iron in non-metal ore or to pre-separate paramagnetic ore and have yielded good economic benefits. ... S.S.; Farahat, M.M.; Boulos, T.R. Optimizing the performance of the RER magnetic separator for upgrading silica sands. Part. Sci. Technol. 2017, 35, 21–28. …