JAPAN -- Valmet will deliver a white liquor pressure disc filter to Daio Paper Co. Ltd's Mishima pulp mill in Japan. The new filter is scheduled to start-up in September, 2017. The value of this kind of an order is typically less than Euro 5 million.

White liquor filters are used at pulp mill's chemical recovery process to secure a consistent quality of the white liquor, with an optimal strength suitable for the plant. Modern digesters need a high and consistent quality of white liquor to produce the optimal pulp quality and yield in cooking.

Valmet's delivery includes a new OptiDisc WL filter, pumps piping, valves, platforms, erection and start-up services. The OptiDisc WL 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 in the pulp cooking process.

Daio Paper Co. Ltd's Mishima mill was established in 1943 and today has a pulp production of 2.3 million tonnes/year and a paper and paperboard production of 2.3 million tonnes/year.

*****

Take our annual reader survey here