A material breaking device comprising:
- a frame structure (1) with an upper bracket (1A) and a lower bracket (1B) for support of other elements of the material breaking device;
- an inlet tube (2) fixedly attached to the upper bracket (1A);
- an outlet tube (3) fixedly attached to the lower bracket (1B);
- a tubular housing (4) arranged between said brackets (1A, 1B), wherein the tubular housing (4) is attached to the inlet tube (2) for receiving particles to be milled and to the outlet tube (3) for output of milled particles, wherein the tubular housing (4) is attached to said tubes (2, 3) in a rotatable manner such that the tubular housing (4) can rotate relative to the frame structure (1);
- at least one conical distributor (5) arranged in the tubular housing (4) and comprising recesses (5A) therearound allowing particles to pass along said conical distributor (5), wherein the conical distributor (5) defines a first milling chamber (6), and wherein the conical distributor (5) is fixedly attached to the tubular housing (4);
- at least one outlet cone (7) arranged in the tubular housing (4) downstream from the conical distributor (5) and comprising a through hole (7A) allowing particles to pass through said outlet cone (7), wherein the outlet cone (7) defines a second milling chamber (8), and the outlet cone (7) is fixedly attached to the tubular housing (4), and wherein the first milling chamber (6) or/and the second milling chamber (8) contains milling particles made of magnetic material;
- a permanent magnet unit (9) comprising a permanent magnet (10) and the permanent magnet unit (9) is attached to the tubular housing (4) such that at least two permanent magnet units (9) are provided for each milling chamber (6, 8), and wherein at each milling chamber (6;
- 8) two permanent magnet units (9) are positioned on the outer periphery of the tubular housing facing each other such that the permanent magnet (10) of one permanent magnet unit (9) is positioned adjacent one side of the tubular housing and another permanent magnet (10) of another permanent magnet unit (9) with the same magnetic pole is positioned adjacent an opposing side of the tubular housing and the permanent magnets (10) of each permanent magnet unit (9) are positioned so that each of these magnets (10) faces the outer wall of the tubular housing (4) with the same magnetic pole;
- a drive unit for providing rotation of the tubular housing (4) relative to the frame structure (1), the inlet tube (2) and the outlet tube (3) creating rotating magnetic field within the milling chambers (6, 8).