Pilot Testing of HCN Removal from Coke Oven Gas using Ferrate (VI) Solution

Coke oven gas (COG) is widely used as a fuel in integrated steel plants; however, it contains trace amounts of hydrogen cyanide (HCN), a toxic compound that contributes to nitrogen oxide (NOₓ) emissions during combustion. This study presents an effective approach to mitigate NOₓ emissions by removing HCN from COG using FerSol®, a ferrate(VI) based oxidizing solution. Pilot-scale experiments were conducted in a miniaturized scrubber system treating clean COG from a coke plant with FerSol® at varying concentrations. Results demonstrate that HCN can be completely removed from COG using ferrate(VI). Analysis of the spent solution indicates that most cyanide present in the liquid phase is decomposed by ferrate(VI). This ensures that residual cyanide does not contribute to NOₓ emissions at the wastewater treatment plant.

Authors:

Haider Sultan | Danieli Corus B.V.
 

Peter Klut | Danieli Corus B.V.
 

Ruud Herold | Danieli Corus B.V.
 

Tim Last | Danieli Corus B.V.
 

Sina Samimi Sedeh | Ferr-Tech B.V.
 

Richard Bruins | Ferr-Tech B.V.
 

Session Chairs:

Joseph Juronoc | Steel Dynamics Inc. - Flat Roll Group - Butler
 

Tim Fox | Veolia WTS USA, Inc.