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Problem in Vertical Mill VSM (2 replies)

Bill Rico
9 months ago
Bill Rico 9 months ago

We are facing a problem at vertical raw mill that mill not getting feed according to designed capacity all things ok. Please share your thinking according to your experience. And one more thing if, in a vertical raw mill operating manual, it is described that mill is designed up to feeding size is 75 so what is the ratio of size between raw material itself means that what is the ideal sieve analysis result for raw mill feed.

9 months ago
Unterstarm 9 months ago

The traditional view with VSM's used for raw material grinding in the cement industry is that they need the feed to be typically minus 75 mm size. However this theory has been disproved at several works where trials were carried out using finer feed. The benefits from reducing the feed size are usually higher than you would predict from Bond predictions but you may need to optimize other factors. Higher throughput can show up weaknesses in the separator performance and it also helps if you have a well sized ratio of mill fan kW to mill motor kW. To avoid the risk of higher mill vibration you need table and rollers well maintained and water injection optimized. The drying capacity of the mill is also critical to performance and there is no point being able to grind more if you don't have sufficient drying capacity to suit the higher output.

Kumar Choudhry
9 months ago
Kumar Choudhry 9 months ago

Did you change new liner for table and grinding rollers? Could not get the meaning of all things ok, whether it was running with a designed capacity before?

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