1156 posts
TimePosted 22/08/2006 10:21:19

### Kiln feed Question 1

NOx control approaches applicable to the cement industry may be grouped in three categories: process modifications, combustion control, and NOx reduction controls. One process modification that can be quantified is the CemStar process, which is a small addition of steel slag to the raw kiln feed. Can you provide more information on CemStar?

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1156 posts
TimePosted 22/08/2006 10:21:20

### Kiln feed Question 13

What should be the standard sieve sizes for limestone feeding to Vertical roller mill. We were earlier using Limestone having bond index of 8-9kWh/short tonne. Now we are having limestone with bond index 11-14kWh/ short tonne. Wether any reduction in mill feed size will improve the output of the rawmill. How to calculate finess modulus of crushed limestone and what is the optimum value for VRM.

1156 posts
TimePosted 22/08/2006 10:21:20

### Re: Kiln feed

Yes, reducing the size of the feed to the raw mill should result in an increase in output. Bond's equations use the size grading where 80 per cent of the feed is passing to characterise the size of the feed to the mill. The optimum size of mill feed is related to the nip angle between the rollers and table. 60mm is quoted as the maximum size.

1156 posts
TimePosted 22/08/2006 10:21:20

### Kiln feed Question 14

We have a plant of short kiln with two stations 52m length and 4.8m dia since some months we are facing problem of red glow under tyre 2 which is in burning zone the temperature increased more than 500C and also in this location contineous sliding of material is available.can u give us any solution to get rid of sliding and also make some coating in that place. The temperature sometimes reaches to 570 degrees C