Dear Wheresjackbenny,

We dealt with this in the Q&A last Tuesday, on March 16.

The acceptable level of NOx for an iron ore pelletizer will depend on local regulations and it is difficult to define any type of general rule. At this point, we have not experienced delays in obtaining contracts due to NOx concerns. NOx is generated in almost all high temperature processes, whether heated by conventional burners or plasma torches. As indicated in the references you have cited, there are several methods that could be used for NOx reduction in the furnaces. Staged combustion would probably not apply in the case of a plasma torch, as the torch does not combust any gas. 

Suffice it to say that so far, although it is an issue plaguing the industry, we do not see this being a deal breaker. 

Hope it helps,

Clémence Bertrand-Bourlaud on behalf of Peter.