What are Multi Metal Separating Systems - "MMS"?

Multi Metal Separating Systems are small, extremely flexible scrap milling separating plants which are able to process a wide range of input material, whereby the necessary change-overs can quickly performed.

Generally small, universal special scrap mills with power consumptions between 500 and max 1,250 hp are used. These mills can be speedily and easily modified in their hammer configuration, the grates and wear plates changed for the processing of various material. Their flexibility ensures a short-term change-over between the different input materials.

Liberation, cleaning, separating and classifying of the materials is aided in a very efficient and economical way by the well-designed peripheral plants downstream of the special scrap mill.

Flow diagram, fig. no. 1, shows a MMS system which is capable of processing following input materials in a weekly turn-around:

• car bodies, either whole or sheared
• mixed scrap/light scrap
• aluminium scrap
• cutoffs and punching to be made into cooling scrap
• stainless steel cutoffs or waste
• small electric motors up to 7.5 kW and electric cabinets
• copper waste (dynamos from headlights and starters, electronic scrap, copper cable cut, from 25 mm dia.)

Special patented grates are used for granulating in the production of valuable copper fractions. The configuration and cross-sections were determined in the process of many years of testing and improvement.

The excellent efficiency of multi-metal separating plants is without question. taking as an example a working 1,000 hp MMS plant in which

• about 50 % mixed scrap and car bodies (for 2 weeks operation at a time)
• about 25 % aluminium or stainless steel scrap (1 week)
• about 25 % electric motors, dynamos and electric scrap (1 week)

are processed, based on a single shift operation, a payback time of about 2.3 years can be reached. If the material comosition is altered and there is a higher input of electric motors and electronic scrap, the payback time is considerably shortened.

Particulary decisive, as already mentioned, is the flexibility of the plant, with its short change-over times, permitting in the course of one month 4 or 5 different input materials to be processed to final productions with very good purity:

• ferrous material with an extremely low content of airborne fluff and a copper content of less than 0.1 % (the density of this ferrous fraction can be increased to a cooling scrap density of 1.2 to 1.4 t/m³ with the use of a suitiable grate)
• mixed nonferrous material can reach a purity of up to 95 %
• from motors and dynamos a copper purity of 90 to 93 % can be obtained
• there are, furthermore, residues from which, after liberation, additional copper, ferrous and aluminium can be recovered

The waste components which have to be disposed of, have a low mass and, therefore, do not produce high waste disposal costs.

The installation of MMS systems is not only worth considering in countries with high wages, but also, because of the high mechnisation, low personnel costs as a result of a small number of personnel required, the excellent recovery rates, particulary of nonferrous material and because of the low energy consumption of the shredder, will be economical anywhere.

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