Ferrous particle magnetic removal and collection apparatus

A method for removal of entrained ferrous particles from a desired material, through magnetic attraction, comprising the steps of:

• creating a magnetic field along a non-linear portion of an outer surface of a cylindrical roller;
• positioning the cylindrical roller in a material flow;
• attracting ferrous particles from the material flow onto the non-linear magnetized portion of the outer surface of the roller;
• rotating the cylindrical roller relative to a linear obstruction substantially in contact with the outer surface of the roller to force the ferrous particles along the non-linear magnetic field of the outer surface of the cylindrical roller towards an area of reduced magnetic field;
• and
• removing the attracted ferrous particles from the outer surface of the roller.

An apparatus for removal of entrained ferrous particles from a material flow, the apparatus comprising:

• an inlet and an outlet defining a material flow way therebetween;
• a magnetic roller rotatably positioned in the material flow way, the magnetic roller having an outer surface defining an axial length and a radially attractive magnetic field induced between a first and a second spaced apart contiguous cylindraceous spirals extending substantially along the axial length of the outer surface of the roller;
• and
• a permanent magnet sandwiched between the first and second contiguous cylindraceous spirals to induce opposing magnetic poles of the magnetic field in the first and second spirals extending substantially along the axial length of the roller.

A magnetic separator for separating entrained ferrite particles from a material flow passed through the separator, the magnetic separator comprising:

• a housing defining a material flow path through which the material flow is directed;
• at least one cylindrical, roller positioned within and axially aligned perpendicular relative to the material flow path and rotatably driven by a motor;
• the at least one cylindrical roller having an outer surface in direct contact with the material flow;
• the outer surface of the cylindrical roller being defined by a separated first and second contiguous cylindraceous spirals being separated by and having opposing magnetic poles induced therein by a magnet;
• and
• wherein at least a portion of both the first and second contiguous cylindraceous spirals defining the surface of the roller being continuously directly in contact with the material flow and opposing magnetic poles induced therein generating a constant strength cylindraceous spiral magnetic field directly on the outer surface of the roller in contact with the material flow and wherein the first and second spirals each define a relative substantially separate first and second path for the attraction and retention of ferrite particles from the material flow.