1156 posts
1156 posts
Re: Burning
The effect of dust recirculating from the cooler in the secondary air is potentially disastrous. I have seen occasions where the dust keeps increasing until the kiln is full of dust and the firing has to stopped while the kiln is emptied of dust. The dust affects the combustion of the fuel in the flame and the problems tends to intensify in a vicious circle. Potential causes are poor combustion in the flame or elevated sulphate content in the clinker. (See April 2003 issue of ICR for an article about dust formation with pet coke firing in cement kilns).
1156 posts
Burning Question 18
I am working out the percentage by-pass required for a large precalciner-preheater kiln for the production of low alkali cement. As the presence of chloride in the raw meal is noted, the volatility of the K2O and Na2O is supposed to increase. Can you provide me some relationship between the increase in the volatility of the alkalis with the increase in Cl content.
1156 posts
Re: Burning
There is no absolute relationship between chloride content and alkali volatility. This depends on the other anions present and also the burning zone temperature in your kiln. However, it is possible to say that the presence of chloride will increase the volatility of alkalis.