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und Roheisen GmbH, Duisburg.

Zinc production within the DK process

Waste materials with zinc contents up to 10% recycled by DK mostly cannot be processed in blast furnaces in integrated metallurgical plants. After many years of development, DK managed to optimise its blast furnace in such a way that it can now apply waste materials containing zinc without any difficulty, i. e. the exhaust gas from the blast furnace, the so-called blast furnace gas, contains dust and is purified in dry and wet cleaning phases. The high-purity Zinc Conzentrate with zinc contents between 65-68 % is a valuable by-product and is sold to zinc metallurgical plants. The purified blast furnace gas is utilised both in our own power plant and to warm up the air injected into the blast furnace.

 

 

 

 

 

 

 

 

 

 

Dry cleaning phase

First, the coarse dust is separated. The flue dust created in this first step, and which has zinc contents of approx. 30%, is usually sent to external zinc users for further processing.
 
Dry cleaning phase

 

Dry cleaning phase

First, the coarse dust is separated. The flue dust created in this first step, and which has zinc contents of approx. 30%, is usually sent to external zinc users for further processing.
Dry cleaning phase

Wet cleaning phases

Afterwards, the remaining fine dust is removed in the hurdle and Theisen washer. The wash water/waste water that has absorbed the dust particles flows to the thickener. A dust sedimentation process takes place building a kind of sludge that remains at the thickener's bottom and that can be pumped out afterwards.
Wet cleaning phases

Zinc concentrate

Zinc concentrate with zinc contents of 65-68 % is being produced due to the following dehydration process taking place in a filter press.
Zinc concentrate