Patent ID: 6193176
Filing Date: 2001-02-27
Classification: B02C,Y02P

Abstract:
A method of grinding cement clinkers by use of a cement clinker grinding apparatus, said method comprising:supplying feed material to be ground on a central area of a table of a vertical roller mill, said vertical roller mill having said table for rotating about a vertical axis and a plurality of rollers arranged on said table at circumferential intervals in a rotating direction of said table;grinding the feed material by pressing force of each of said rollers onto said table, said pressing force being selected so that a roller pressure per full sectional area of said roller is from 10 to 15 kg/cm.sup.2 ;removing all the ground material from an underside of said table;mechanically conveying all of the ground material taken out of said vertical roller mill to a position higher than said vertical roller mill;separating material suitable for end product that does not need further grinding process from the material mechanically conveyed and;returning all conveyed material to said vertical roller mill except the separated material as end product.