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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

© ANDRITZ

Pulp process with A-Recovery+ chemical recovery concept

© ANDRITZ

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

Sulfuric acid production

A-Recovery+ chemical recovery solutions.

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Lignin recovery

Recovering high-quality lignin from black liquor in kraft mills.

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Methanol purification

A-Recovery+ chemical recovery concept for methanol purification.

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HERB recovery boilers

The recovery boiler plays a central role in the chemical cycle of a modern kraft pulp mill and generates energy for the mill.

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contacts
ANDRITZ Oy
Finland
Tammasaarenkatu 1
FI-00180 Helsinki
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  • 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