Have you checked alkalies in raw Mix. You may need a bypass to control heavy coating in these areas ■

Hi Surri,

Coatings can have a variety of causes. Look for clues:

* - Is it a general coating, or is it concentrated at a particular location?

* - Do a chemical analysis of the coating - the products of combustion can be quite varied. A chemical analysis will give you a clue on what is the dominant source of the coating

* - How is the fuel introduced to the kiln? Changes here can make a difference to the formation of coatings at a kiln entrance

Regards - John.rz ■