This investment is part of Rottneros AB’s larger rebuild project called Agenda 500, which aims to increase availability and the total production volume at both of Rottneros AB’s pulp mills, Rottneros Mill and Vallvik Mill, and with a target to reach a capacity of 500,000 tons per year.
The new white liquor filter will replace an existing filter delivered by Valmet in 1990. A larger filter is needed to handle the capacity increase at the mill. Start-up of the new filter is scheduled for autumn 2016.
Valmet’s delivery includes a new PDW-type white liquor filter, erection, start-up services, basic engineering for piping, for instrument and for 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 (NPE’s) in the white liquor can cause.