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und Roheisen GmbH, Duisburg.

Blast furnace plant

DK has two blast furnaces with capacities of 580 m, and 460 m respectively. However, basically one blast furnace is running, and the second one is meant to work as a spare plant.

The blast furnace is automatically filled in batches from the top with sinter, fluxes and coke. Depending of the furnace, more than 12 (or 9, resp.) blowing moulds enriched with oxygen are filled with hot air of approx. 1000 C, through which the coke is burnt down to CO in the frontal part of the blowing moulds. The iron oxides (Fe2O3, Fe3O4) in the sinter are gradually reduced in the blast furnace, i. e. indirectly by the CO created, and directly by the carbon in the coke. Thus, liquid pig iron is accumulated at the end of this process with liquid slag in the blast furnace hearth.

 
Blast furnace plant

 

 

An optimised blast furnace process

Due to corrosion protection measures in the automotive engineering area, the zinc content of ferrous waste materials has increased. Through an intensive process control of the sintering plant including the blast furnace, several metallurgical and process technical measures, blast furnace procedures were optimised accordingly, i. e. that waste materials containing zinc might be presently applied in a conscious manner.

An optimised blast furnace process

Due to corrosion protection measures in the automotive engineering area, the zinc content of ferrous waste materials has increased. Through an intensive process control of the sintering plant including the blast furnace, several metallurgical and process technical measures, blast furnace procedures were optimised accordingly, i. e. that waste materials containing zinc might be presently applied in a conscious manner.
Blast furnace plant

Capacity

The DK blast furnace produces up to 1,200 tons special pig iron per day, and is discontinuously tapped every two hours.
Tapp

Quality warranty

Due to small ladle sizes, a relatively high frequency of chemical analyses is required. Thus, DK is in the position to provide production analyses within the QS system as requested by customers.
Quality warranty

25 t ladles

Due to the blast furnaces, the DK pig iron is casted in 25 t ladles. Each ladle is spectrometrically analysed before the transition into the foundry machine in order to safeguard the utmost alloying precision.
25 t ladles

Slag casting

The blast furnace slag created in the blast furnace during the pig iron production will be casted into the slag bed in order to be cooled. Thanks to this specific cooling process, a natural rock is created whose composition corresponds with a magmatic rock which is mainly being used in the building industry.
Slag casting