The ornamental design for a magnetic separation apparatus, as shown.
FIG. 1 is a right side elevation view of a magnetic separation apparatus, embodying our new design;
FIG. 2 is a front perspective view thereof; and,
FIG. 3 is a rear perspective view thereof wherein the upper portion is inverted.
No color is claimed as part of the design, nor are any logos, and/or written matter claimed as part of the design. Additionally, no claim is made to the table or shadows if shown.