A-Recovery+ key visual image, ballerina dancing inside a infinity symbol
  • PULP & PAPER products
  • Pulp production
  • Kraft pulp
  • A-Recovery+
  • Chemical recovery concept

A-Recovery+ chemical recovery concept for kraft mills

See the chemical recovery cycle in a new light

The goal in a kraft mill is always to operate the chemical recovery systems as efficiently and environmentally soundly as possible while minimizing expensive capital investments.

ANDRITZ was inspired to take a fresh look at how to achieve this goal given that, over the years, many of the chemical “loops” have been closed to reduce emissions and effluents. 

These loop closures have often been accompanied by build-ups of certain chemicals and the creation of side-streams and waste-streams that are either ignored or disposed of. Some of these side-streams represent an opportunity to generate revenue, as they contain potentially valuable raw materials for commercial-grade bioproducts if they are processed.

These challenges set the stage for innovation – and ANDRITZ took the lead by shining a new light on the chemical cycle. The result is a technical solution called A-Recovery+ chemical recovery concept. A tailored chemical recovery system that optimizes chemical balances in a mill to increase its ability to generate additional revenue and to avoid the cost of certain purchased make-up chemicals.

A-Recovery+ chemical recovery concept generates economic value from the side-streams in kraft pulping by:

  • Purifying raw methanol to commercial quality bio-methanol
  • Producing commercial quality sulfuric acid on-site from concentrated non-condensable gases
  • Recovering high-quality lignin from black liquor

Introduction to the ANDRITZ A-Recovery+ chemical recovery concept

Standard pulp process


Pulp process with A-Recovery+ chemical recovery concept


Benefits of A-Recovery+ chemical recovery concept:

  • Environmental and economic savings
  • Further closure of chemical recovery loops
  • Management and control of Na/S balance
  • Generation of key chemicals avoids purchased costs
  • Additional opportunities for revenue generation
  • Removes obstacles to fossil free operation


GOING FULL CIRCLE Sulfuric Acid Production for Puma I and II

Brazilian pulp and paper giant Klabin is further closing the circular sustainability loop at its Puma I and Puma II projects in the south of the country. Soon it will be making its own sulfuric acid from captured non-condensable gases at its Ortigueira mill site. ANDRITZ expertise is paving the way.

Biomethanol– forming a circular bioeconomy at pulp mills

Over recent times pulp mills have become much more than simply “tonnes per year” in terms of revenue. First came the added extra of energy and district heating, then extracts of tall oil and turpentine, now all sorts of areas for extra revenue are being identified at pulp mills. As a clear example – and with the help of ANDRITZ – Swedish market pulp giant, Södra, recently started up the world’s first biomethanol plant at its Mönsterås mill in Sweden.

Circle-To-Zero – Towards Zero Emissions and Zero Waste at Pulp and Paper Mills

CircleToZero™ is a global ANDRITZ initiative with the goal of achieving zero emissions and zero waste at the same time as creating financial growth for customers. For pulp and paper producers, this means eliminating unused industry side streams, turning them into new value-added products and achieving zero emissions and zero waste production.

A-Recovery+ chemical recovery concept allows mills to see the chemical cycle in a new light

Over the years, chemical recovery technology suppliers have worked with pulp mills to “close” the chemical recovery loops in order to reduce emissions and effluent – and also to increase recovery efficiency. These loop closures have sometimes led to a build-up of certain chemicals and the creation of side streams that are either ignored or disposed of.

Find out more ...

Tammasaarenkatu 1
FI-00180 Helsinki
Get in contact
  • A-Recovery+ chemical recovery solution

    A-Recovery+ recovery solutions

    PDF : 1.4 MB
  • See the chemical cycle in a new light

    SPECTRUM issue 37

    PDF : 1.1 MB