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Dry magnetic separators for increased recovery or ore at high belt speeds
Dry magnetic separators for increased recovery or ore at high belt speeds
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机译：干式磁选机可提高带速下的矿石回收率
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摘要
This invention relates to improvements in a dry magnetic separation system for increasing the recovery of magnetic ore from the feed material. The system includes a separator which has a magnetic head- pulley assembly mounted in one end of an endless belt conveyor loop. When the conveyor is run at high speeds some of the ore is thrown off the head- end of the belt instead of being retained on it by the magnetic pulley. Those ore particles that are retained are carried onto the lower flight of the belt from which they are dropped into an ore chute. To recover the magnetic portion of the "thrown" ore, an adjustable splitter is located outwardly of the pulley-head at a lower elevation than the belt. The splitter also directs these partially magnetic particles into the ore chute and the non-magnetics to a tailings chute. The improvements of the present invention increase the degree of separation by making the trajectory of thrown particles primarily a function of their magnetic content and eliminating other factors. The fine magnetic ore particles that lay on top of large non-magnetic particles are stratified to the bottom of the belt. Without the stratification, these fine magnetic particles would be lost to tailings with the large non-magnetic particles. The improvements include apparatus for vibrating the feed particles to stratify them by size, and apparatus for minimizing the depth of the feed layer by allowing it to progressively increase in width in the direction toward the magnetic head-pulley. Thus, a thin layer of feed stratified by size may be obtained so as to achieve better separation by magnetic attraction and trajectory at high belt speeds.
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