Patent ID: 8807344

Claim:
An adjustable magnet configured for use in a magnetic separator, the adjustable magnet comprising: a magnet array including a plurality of permanent magnets defining an arcuate magnet array surface and configured to provide an array magnetic field; the magnet array defining a leading end and a trailing end; an adjustment mechanism including a mounting bracket, a first arm, and a second arm; wherein the mounting bracket is fixedly attachable to a fixed member of the magnetic separator; wherein the first arm is: adjustable in length, pivotally attached at a first end to the mounting bracket, and pivotally attached at a second end to one of the leading end and the trailing end of the magnet array; wherein the second arm is: pivotally attached at a first end to the mounting bracket, and pivotally attached at a second end to the other of the leading end and the trailing end of the magnet array; wherein the first arm and the second arm are each pivotable relative to the mounting bracket and to each other to position the arcuate magnet array surface adjacent to a separating surface defined by the magnetic separator; wherein the location of the separating surface is defined relative to the fixed member; wherein the position of the arcuate magnet array surface relative to the separating surface is adjustable to a plurality of positions by adjusting the length of the first arm; and wherein an effective magnetic field is defined at the separating surface by the array magnetic field and the position of the arcuate magnet array surface relative to the separating surface.