ANDRITZ LimeLine recausticizing systems

High quality conversion of green liquor to white. ANDRITZ is a leading innovator of chemical recovery technologies to produce high-quality cooking liquor from the inorganic chemicals generated in the recovery boiler and lime kiln. ANDRITZ LimeLine technologies for recausticizing is the result of many years of experience and a high level of expertise to design, develop, and install these innovative solutions.

Learn more about recausticizing by watching the video below.

LimeLine recausticizing plant.

Efficiency and control are key to the recausticizing process

The recausticizing process is the final stage in chemical recovery in a pulp mill. The goal is to achieve an efficient and controlled reaction between green liquor and lime to produce as much strong white liquor (NaOH) as possible with high purity for the cooking process and excellent lime mud filtration properties for the lime kiln.    

ANDRITZ LimeLine: high-quality white liquor and minimal losses

ANDRITZ LimeLine recausticizing technology is central to the LimeLine white liquor plant. It is responsible for producing high-quality, homogenous white liquor with minimum alkaline loss and waste. The fully automated LimeLine recausticizing plant generates zero effluents. The equipment achieves high availability and reliability – making it the most cost-effective and environmentally sound technology for producing white liquor.

LimeGreen green liquor filters

LimeGreen: falling film cross-flow green liquor filter

  • Efficient separation of even small impurities
  • High availability
  • Less make-up lime required
  • No need for lime mud precoat
  • Long-life filter cloth
  • Stable operation


LimeFree: dregs handling free of lime mud

  • No lime mud needed – minimizes the amount of solid waste to landfill
  • Optimized lime purging
  • Small footprint – easy installation

Green Liquor Cooler: efficient and trouble-free

  • Less over-liming and over-boiling
  • No cleaning required
  • Fewer shutdowns for acid washing of white liquor filtration
  • Better causticizing control
  • Efficient droplet separation

LimeSlake: multi-compartment lime slaker

  • Large lime mud particles
  • Improved separation of white liquor – alkali savings
  • Improved filtration of lime mud – alkali savings
  • Higher dry solids in lime mud
  • Self-cleaning
  • Effective scrubber
  • Clean working environment

LimeMilk: one-to-three compartment causticizer

  • Flexible design for optimal sizing
  • Carefully agitated
  • No lubrication water
  • No bottom bearing

LimeWhite: white liquor filter

  • Continuous operation
  • Clean and hot white liquor
  • Fully automated
  • Higher white liquor yield
  • Reduces water circulation
  • Less white liquor dilution

LimeDrum: lime mud washing and dewatering

  • Continuous Precoat Renewal (CPR)
  • Reliable, continuous feed to kiln
  • Continuously high dry solids
  • Filter cloth washing during operation
  • Energy savings and less ring formation in kiln
  • Lower TRS emissions

LimeDry: lime mud washing and dewatering

  • High capacity in a single unit
  • Reliable, continuous feed to kiln
  • Continuously high dry solids
  • Filter cloth washing during operation
  • Energy savings and less ring formation in kiln
  • Less TRS emissions
  • Totally closed design – dust-proof, clean working environment
3d rendering of LimeDry-H lime mud drying system

LimeDry-H: lime mud drying system

  • Reduced investment cost and a more compact footprint

  • Lower and more stable energy consumption

  • Improved maintainability

  • Autonomous white liquor plant solutions that increase the level of autonomy inside the lime mud handling process

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