Metallic smelting slag from copper and stainless steel production, or slag from waste incinerators, often contains significant percentages of pure metals in the fine-grain range which are often impossible to recover cost-effectively with classical methods.

In this area, selFrag Technology offers new possibilities for selective separation of even the finest metal inclusions, down to the 100 μm range, with no need for fine comminution of the material.

The electric discharge selectively seeks its path through the solid along metal inclusions, so that they are released or knocked out, without excessively comminuting the mineral component at the same time.

The result: a mix of liberated metals and mineral particles, largely in the sand/gravel range, which can be separated using suitable conventional methods.