ANDRITZ LimeLine white liquor plants

Environmentally and economically efficient white liquor plants. ANDRITZ continues to lead in the development of chemical recovery technologies which not only enable efficient conversion of green liquor to high-quality white liquor, but also minimize environmental impact. ANDRITZ LimeLine white liquor plants recycle and reuse the process streams inside a mill, minimizing waste and potentially costly end-of-pipe removal.

Get familiar with LimeLine by watching the videos below.

LimeLine recausticizing plant.

LimeLine white liquor plant.

The purest white liquor with minimal energy consumption

The major challenge in the operation of any white liquor plant is efficiently converting the green liquor from a recovery boiler into pure white liquor for the cooking process – while minimizing energy consumption and environmental impact at the same time. Critical factors such as incoming liquor quality, fuels available, solid waste (dregs) capabilities, energy costs, and white liquor purity are all considered when selecting the right combination of equipment for a LimeLine plant. 

The industry’s strongest portfolio of white liquor products

ANDRITZ has been the innovator in recausticizing, lime reburning, and auxiliary processes, such as biomass gasification. As such, it offers the most comprehensive and proven portfolio of LimeLine components for each process stage. Our scope includes process solutions and equipment for chemical conversion and filtration, preparation of cooking liquors, auxiliary processes, and on-going support services.

The ANDRITZ product portfolio is designed for traditional white liquor production, white liquor oxidation, and modified delignification liquors for kraft pulping. These products and solutions can be installed in new plants or as upgrades to existing white liquor plants.  LimeLine components are designed to be operated as standalone unit processes, but offer truly superior performance when integrated into a modern, energy-efficient, and environmentally safe plant.  The results are high white liquor purity, reduced and cleaner air emissions, higher energy efficiency, and reduced waste for the landfill – even with closed-cycle process loops.

ANDRITZ draws from its experience as a global supplier of new recausticizing plants, plant modernizations, new lime reburning kilns, kiln modernizations, and several plants for white liquor oxidation or modified white liquors worldwide.


LimeLine white liquor plant. Suzano, Três Lagoas (MS), Brazil.


LimeLine white liquor plant. Suzano, Três Lagoas (MS), Brazil.

Processes and technologies available from ANDRITZ


SPECTRUM Podcast - Episode #24

Improved efficiency means a lower carbon footprint. How can this be achieved in the white liquor plant? Improved efficiency leads to less overall energy use which in turn means the lowering of carbon footprint. In the search for improvements in white liquor plant operations ANDRITZ has developed a uniquely simplified and ultimately more efficient technology, LimeDry-H, for improved lime mud feeding.

A major step to reduce carbon footprint in pulp mills

Biomass Gasification for Lime Kilns — Going fossil fuel free is an urgent sustainability topic that has become even more critical due to the current global energy crisis. It is clear we must reduce our dependence on fossil fuel.

Predicting the Future - Metris Digital Twin in Action at Äänekoski

We have heard a lot about the possibility of “foreseeing digitally” when it comes to processes in the pulp and paper industry, but now it’s actually happening. Metsä Fibre’s Äänekoski bioproduct mill in Finland is predicting the future utilizing the latest digital technology from ANDRITZ for its white liquor plant.

Lime kiln with LimeFlash-H system at night
A boost for the lime kiln - LimeFlash-H

Increasing capacity of the lime kiln is time consuming and costly as it usually involves the lengthening of the existing kiln shell, or even a replacement with a larger diameter. ANDRITZ experts have approached the challenge from a completely different angle, and now a capacity increase of up to 40% can be achieved at much lower costs.

Äänekoski: Reinventing to get more from less

The pulp making process hasn’t inherently changed over the years; however, ANDRITZ has had a lot of success with reinventing processes and technology in and around mills to increase capacity, improve quality, and cut operating costs. The LimeWhite-H White Liquor Disc Filter is another game-changing development.

Helios shines bright at SCA Östrand

The largest engineering projects northern Sweden has ever seen was completed recently with the doubling of capacity at SCA Östrand’s softwood kraft pulp mill. The project – named Helios after the God of the Sun in Greek mythology – is now setting a new global benchmark in high-performance pulp production. ANDRITZ supplied some of the latest key technology to the completely rebuilt mill.

Find out more ...