Wertstoffe • Recyclables

Processes for the dry processing of steel slags with LOESCHE mills for metal recovery and production of silicate composite material for use in the building materials industry

Quelle/Source: LOESCHE GmbH

LOESCHE-Mühle des Typs LM 15.2 M • LOESCHE mill of the type LM 15.2 M

Quelle/Source: LOESCHE GmbH

1 Edelstahlschlacke, Ausgangsmaterial • Stainless steel slag, source material

Quelle/Source: LOESCHE GmbH

2 Schematische Darstellung des Wirkprinzips in der LOESCHE-Mühle • Schematic representation of the operating principle in the LOESCHE mill

Quelle/Source: LOESCHE GmbH

3 Doppeltrommel-Magnetscheider während der Montage der Mahlanlage in Belgien • Double-drum magnetic separator during assembly in the grinding plant in Belgium

Quelle/Source: LOESCHE GmbH

4 Luftsetzmaschine (Bild: Allair^® von allmineral, aus Firmenprospekt, Beschriftung ergänzt) • Pneumatic jigs (Figure: Allair^® by allmineral, taken from the company brochure, labelling added)

Quelle/Source: LOESCHE GmbH

5 Trockene Dichtesortierung im Fluidbett-Separator• Dry density sorting in the fluid bed separator

Quelle/Source: LOESCHE GmbH

6 Verfahrens-Fließbild zur vollständigen trockenen Aufbereitung von Edelstahlschlacken mit der LOESCHE Vertikalmühle (Anlage Charleroi) • Flow sheet for the complete dry processing of stainless steel slags with the LOESCHE vertical roller mill (Charleroi plant)

Quelle/Source: LOESCHE GmbH

7 Fertigteile aus EDS nach der Autoklavierung und industrieller CO₂-Autoklave [4] • Finished EDS-parts after autoclaving and an industrial CO₂ autoclave [4]

Quelle/Source: LOESCHE GmbH

8 Aufbau der Anlage Farciennes/Belgien • Construction of the plant in Farcienes/Belgium

Quelle/Source: LOESCHE GmbH

9 LM 15.2 M In der Edelstahlschlacken-Aufbereitung in Farciennes • LM 15.2 M for processing stainless steel slags in Farciennes

Quelle/Source: LOESCHE GmbH

10 Aufnahme des Metallkonzentrates unter dem Mikroskop • Photo of the metal concentrate under a microscope

Quelle/Source: LOESCHE GmbH

Dr. Andreas Jungmann
CEO, CALA Aufbereitungstechnik GmbH & Co. KG, www.cala-aufbereitung.de

Dr. Holger Wulfert
Consultant Process Engineering and Technology, Berlin

Summary: The development of recycling processes for the use of material resources from industrial waste products or by-products is becoming more and more important. To this end, comminution processes play a key role in processing the material in such a way that recyclable materials become exposed for subsequent separation processes. It was therefore only a matter of time before LOESCHE GmbH, with its decades of experience in fine comminution processes, became the centre of attention for prospective customers who would like to develop and optimise recycling processes.

1 Preliminary considerations

By-products from the steel industry contain valuable contents. So this article mainly refers to approximately 200 million t/a of steel slags from converters and electric-arc furnaces worldwide, and does not discuss blast furnace slags, which have already been processed to a large extent for many years as a latent hydraulic composite material in the building materials industry. In addition to pure metal (mostly between 3 % and 10 %), there are metal oxides and – depending on the type of steel slag – various mineral phases which can be partly converted into...