Metsä Fibre Äänekoski
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ANDRITZ to supply key production technologies for new bio-product pulp mill in Finland

Scope of supply in short :

  • A complete wood processing plant including three debarking lines designed for world record capacities
  • A fiberline for softwood and hardwood. The line’s softwood capacity will be the highest in the world by far
  • The world’s most energy-efficient black liquor evaporation plant with the highest capacity in Europe
  • A recausticizing plant, which will be the largest in Europe

The new mill will be a next-generation bio-product pulp mill which can convert wood raw material into biomaterials and bioenergy in addition to producing high-quality pulp. It will not use any fossil-based fuels as all of the energy required will be generated from wood.

ANDRITZ’s scope of supplies includes the core equipment for:

  • A complete wood processing plant with three debarking and chipping lines, three stacker-reclaimer chip handling systems, and bark handling. Each debarking line can process both softwood and hardwood and is designed for world record capacities (pine/spruce/birch: 470/350/270 m3 solid-over-bark per hour), and includes a de-icing conveyor, a debarking drum (5 x 48 meter), and the world’s biggest horizontally fed HHQ chipper, ensuring high capacity without compromising the chip quality.

  • A softwood and hardwood fiberline comprising a chip feeding system, a two-vessel continuous cooking plant, a new evaporation system for liquor extraction, and seven DD (Drum Displacer) washers for brownstock washing and bleaching. The softwood capacity of this line will be the highest in the world (3,900 tons per day).

  • The world’s most energy-efficient black liquor evaporation plant with the highest capacity in Europe (1,650 tons/hour). The plant is closely connected to the fiberline using ANDRITZ’s latest innovative and patented solutions, and thus creating the most energy efficient overall combination for the mill. The plant will have seven stages and concentrate black liquor to the very high dry solids content of 85% for efficient combustion in the recovery boiler. In addition, ANDRITZ will also deliver chloride removal systems to enhance the chemical recovery process and to produce liquid methanol, which will be used as a biofuel source.

  • recausticizing plant, which will be the largest in Europe (white liquor production of 16,000 m3/day), and world’s largest single-line recausticizing plant, with two centrifuges for dregs, slaker-classifier, white liquor disc filter, and lime mud disc filter.
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"The bioproduct mill in Äänekoski is the largest investment of the forest industry in Finland. Competence, reliability and successful cooperation in previous large investments were emphasized when we made a decision of the key technology suppliers”

 Ilkka Hämälä, CEO of Metsä Fibre Oy