Reduction of Gaseous Emissions by Applying a Spray-Scrubber-Based Process for Cyanide Compound Reduction in Blast Furnace Gas

The reduction of hazardous air pollutant and greenhouse gases emissions is increasingly required by steel works. The purpose of this study is the definition of an additional blast furnace gas treatment when it is burned in hot blast stoves. It was found that the reduction of cyanide compounds in blast furnace gas through a spray scrubber reduces NOx at the chimney, enabling the increase of hot blast temperature and consequently CO2 emissions reduction. A H2O2-based gas washing water treatment was also investigated to reduce cyanide content before water recirculation/purge. Simulation tools, laboratory tests and in-field measurement campaign were used to prove process effectiveness.

Alessandro Olcese | Paul Wurth Italia S.p.A.
 

Lorenzo Micheletti | Paul Wurth Italia S.p.A.
 

Luca Spadoni | Paul Wurth Italia S.p.A.
 

Ismael Matino | Scuola Superiore Sant'Anna
 

Antonella Zaccara | Scuola Superiore Sant'Anna
 

Alice Petrucciani | Scuola Superiore Sant'Anna
 

Valentina Colla | Scuola Superiore Sant'Anna
 

Teresa Annunziata Branca | Scuola Superiore Sant'Anna