Valmet will deliver a white liquor filter to Rottneros Vallvik pulp mill in Sweden. The filter is part of the facility’s chemical recovery process.
Valmet’s scope of supply includes a new PDW-type white liquor filter; installation; start-up services (scheduled for fall 2016); and basic engineering for piping, instrument and electrical and process control. The PDW pressure disc filter produces completely clear white liquor and washes the lime mud. The very high white liquor yield increases upstream capacity and eliminates the potential process disturbances that increased amount of dregs and other non-process elements in the white liquor can cause.
The new filter, which was needed to handle an increase in capacity at the mill, replaces an existing filter supplied by Finland-based Valmet in 1990.