Saving Gold from Landfills

Waste Handling & Recycling

Saving Gold from Landfills

Recovery of Metals from fine Shredder Fractions
Approximately 20 grams of gold, 200 to 300 grams of silver, as well as platinum and other precious and non-ferrous metals: this multitude of resources can be hiding in one tonne of heavy non-ferrous fraction, and which until now have invariably been deposited in landfills. A new one-of-a-kind process allows to reclaim and sell these metals profitably.
(ed. WoMaMarcel - 18/9/2015)
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Cleanly Separated Materials

At the end of the process, all of the fractions are cleanly separated in bins. In addition to proportions of the precious metals mentioned above – gold, silver and platinum – the fraction of non-ferrous metals contains considerable amounts of aluminum, copper and brass, which can also be sold. Depending on the composition of the waste material, the BHS fine treatment plant recovers between five and seven percent of this input as saleable non-ferrous metal.

A positive cost factor is that the whole process is to a large extent automatic and the entire plant can be controlled and monitored by just one employee. An additional employee spends about half of his working hours on the material logistics.

The BHS Rotor Impact Mill

The BHS rotor impact mill for recycling applications (type RPMV) is absolutely unrivaled with its horseshoe-shaped hammers. It contains a plate to which the hammers are attached. The input material is fed into the machine from above through the centrally-located feed tube. When the material hits the rotor, it is accelerated outward at high speed by the centrifugal forces, where it is then caught by the horseshoe-shaped hammers, which impel it against the anvil ring of the outer wall. The impact breaks the input material into pieces.

3D graphic of the rotor impact mill of type RPMV with open cover.

Repelled by the anvil ring, the material hits the hammers again, is further crushed or shaped into balls, and thrown back against the anvil ring. This repeats until the material is small enough to pass through the gap between the rotor and the anvil ring, and falls out through two discharge ducts.

The gap between the horseshoe hammers and the anvil ring is adjustable and the peripheral speed of the rotor is variable, making the BHS rotor impact mill flexible for use in a wide range of applications.

The hammers can be manually removed, installed, or adjusted without tools. The virtually constant gap between the anvil ring and the hammers ensures a consistent quality of the final products over the whole service life of the wearing parts. The entire inlet cover can be pivoted for optimum accessibility, which greatly simplifies maintenance of the machine.

The hammers and the elements of the outer wall are exchanged without tools.

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