Bleaching Agent: Quicklime is utilized to bleach cellulose pulp, enhancing the brightness and whiteness of paper.

Caustic Soda Regeneration: It regenerates caustic soda, a key chemical used in the pulp-making process, contributing to the closed-loop system in modern pulp mills.

Water Treatment: Quicklime is employed to treat residual water from the pulp production process, ensuring environmental compliance.

Dissolving Wood Elements: It helps dissolve non-cellulose components of wood, such as lignin, improving the quality of the pulp.

Producing Precipitated Calcium Carbonate (PCC): Quicklime is critical in producing PCC, a high-purity mineral that serves as a filler in paper. PCC increases volume, improves porosity, brightness, and opacity.

Industrial Waste Treatment: Quicklime treats industrial sludge, wastewater, and flue gas, reducing pollution from paper mills.

Reducing Pulp Quantities: By improving paper quality, quicklime can reduce the amount of pulp required, making paper production more efficient.

Reducing Tree Usage: Quicklime contributes to sustainability by decreasing the need for trees in paper production.

Additionally, quicklime plays a vital role in the closed chemical circulation system of modern pulp mills, reducing the environmental impact by recycling chemicals used during the cooking process.