Patent ID: 8206596

Claim:
An apparatus for magnetic separation of solid material from solid-liquid mixture, comprising at least one magnetic separation unit, and the magnetic separation unit comprising: an inner cylindrical vessel having an inner surface, an outer surface, and a bottom portion, wherein the bottom portion of the inner cylindrical vessel is magnetizable and comprises a bottom plate, an outer cylindrical vessel having an inner surface, an outer surface, an inlet, a first outlet, a second outlet, an upper portion, and a bottom portion, wherein the bottom portion comprises a cone-shaped receiving plate for collecting solid material from the bottom portion of the inner cylindrical vessel, and the cone-shaped receiving plate is connected to the second outlet for discharging the solid material via a pipe; the inlet is located at the bottom portion above the cone-shaped receiving plate; the first outlet is at the upper portion of the outer cylindrical vessel; and a flow channel is formed between the inlet and the first outlet, and a magnet within the inner cylindrical vessel, wherein the magnet renders the bottom portion of the inner cylindrical vessel magnetized during a first period and demagnetized during a second period, and wherein at least part of the inner cylindrical vessel extends coaxially inside the outer cylindrical vessel and makes no contact with the inner surface of the outer cylindrical vessel; the bottom portion of the inner cylindrical vessel is in close proximity to the inlet.