We have ESP at the kiln system. It is also used for raw mill system. System is sent ESP's feedback to kiln feeding silo. There are two homogeneous silos and two stockage silos. Material is sent from ESP to homogeneous silos. So, my question is that, I am thinking to feed the ESP's feedback directly to preheater system but this line will be entered to system after weighfeeder. We have got line to feed this material before weighfeeder but it causes to reduce of fresh feeding. In this way I want to increase clinker production with same feeding amount. What do you think?

Your idea is a very good one. There are plants that do exactly what you propose. This has the advantage that the chemistry of the kiln feed is more stable because it is not destabilised by slugs of ESP dust being added to the homegenisation silo when the raw mill is not running. I am not sure that you will get more output but the kiln operation and clinker quality should be more stable.

I would like to ask two questions (1) what influence has the fineness in the slurry in wet process in low/normal operation what happens in the kiln and chemistry change and the life of the refractary? (2) what happens in the kiln when burned the slurry with a moisture about 40-43 per cent especially the life of the refractory?

When the fineness of the slurry is low then potentially it will be more difficult to combine into clinker. This is not a chemistry change but the fact that there are larger particles means that conversion into the clinker minerals is more difficult as this is a solid state reaction and is dependent on the surface area and contact between the particles. Because the clinker combination is more difficult more fuel will need to be burnt and this could adversely affect the refractory life. The same applies to a high slurry moisture content. Because there is more water to evaporate in the kiln more fuel must be burnt. Again this can cause the refractory life to be reduced.