DHZ AG – Extracting concentrated metals from incinerator bottom ash

July 2016

The reference at a glance


Processing of incinerator bottom ash


Impact mill of type PM 0806 and rotor impact mills of type RPMV 1113 and type RPMX 1516.

Operating site

Impact mill of type PM 0806 and rotor impact mills of type RPMV 1113 and type RPMX 1516.




Fine processing of metal concentrates from waste incineration plants for immediate reuse in the melt.


Turnkey plant comprising one impact mill and two rotor impact mills from BHS.

DHZ AG operates a modern recycling center in Lufingen in the Swiss canton of Zurich. The facility focuses on processing incinerator bottom ash (IBA). BHS-Sonthofen supplemented two existing IBA processing plants with an additional plant that extracts high-quality, heavy and light non-ferrous metal fractions from the coarse concentrate generated upstream. These are of such high quality that they can be sold directly to smelters or to industrial customers.

The key advantage of the BHS system for DHZ AG is that it works based on a dry process. Wet processing would have incurred significant additional costs due to the high requirements associated with water and sludge treatment. BHS delivered two complete lines, from feeding systems through to big bag loading stations. One line processes particle sizes from 8 to 100 mm, and the other takes care of fine processing in the range of 0 to 10 mm.

The system comprises an impact mill of type PM 0806, one rotor impact mill of type RPMV 1113 and one rotor impact mill of type RPMX 1516 from BHS-Sonthofen. These machines process granulates with grain sizes from 8 to 100 mm and produce a fine output ranging from 0 to 10 mm. The plants also include screening machines, zigzag sifters, cyclone separators, magnetic drum-type separators and separating tables. The turnkey facility also includes a conveyor system, a dust removal system, steel construction works as well as controlling and visualization.

As a final step, the processed material is cleanly separated by type according to light and heavy non-ferrous metals, ferromagnetic materials, oversized particles and dust, and then filled into big bags.