| 摘要 |
<p>The process uses the positive experience of total refuse comminution in a ball mill, after which the (iron) sheet metal scrap appears squeezed (compacted) as small, very clean clumps. The iron fraction, mainly sheet metal scrap, is separated by means of a magnetic separator before or after a thermal treatment from the household refuse or the combustion or pyrolysis residues, and is after-treated in a rotary drum partially filled with steel balls. The iron scrap portions compacted into small clumps are separated off after the rotary drum, e.g. by a magnetic separator. Without the milling energy to be used in total refuse comminution, and with relatively small capital costs for a very simple rotary drum, an iron scrap having a very small bulk volume is recovered which is as clean and compact as after the comminution of the refuse in a ball mill. In comparison with an after-treatment with a shredder plant, the wear costs are minimal, the bulk volume of the scrap and its degree of purity are still better than those after a shredder plant with subsequent separation of the residual dirt. The process is suitable for all refuse processing plants, such as composting plants, sorting plants, combustion plants or pyrolysis plants.</p> |
