Finish grinding with vertical roller mills-operating data

Vertical roller mills offer significant potential for savings when used for finish grinding. Two installations in Peru and the Dominican Republic are being examined with specific data on cement production, product fineness, specific power consumption and concrete strength. The vertical mill at Cementos Pacasmayo, SA in Peru was commissioned in December 1999, and the mill at Cementos Nacionales in Dominican Republic was commissioned in August 2000. Installed production rates range from 40 stph to over 200 stph per mill. The variety of sizes makes the vertical roller mill an attractive alternative to ball mills for additional cement grinding capacity or as stand alone installations for modern cement producers.