Lime products are a key component of fibre processing, chemical process control and paper finishing. They enable efficient chemical recovery in the kraft process, stabilise the pH value in sensitive process stages and contribute to the purification and treatment of process water. Additionally, precipitated calcium carbonate (PCC) improves the optical properties of paper – such as whiteness, smoothness and opacity – and promotes consistent printability. Lump lime or quicklime (CaO), hydrated lime (Ca(OH)₂) and precipitated calcium carbonate (CaCO₃) ensure stable processes, high product quality and resource-efficient production.
The products of the Calmit Group are specially tailored to the requirements of the paper industry – from fibre preparation and water treatment to paper finishing.
Why lime and PCC are indispensable in the pulp and paper industry
Quicklime plays a central role in fibre processing and chemical processes, as it is used for the recovery of caustic soda. Hydrated lime plays an important role in regulating the pH value in various process phases. This creates stable reaction conditions, which in turn ensures consistently high paper quality. It is also used in water and wastewater treatment to neutralise, precipitate and stabilise process water, contributing to environmentally friendly and legally compliant production.
Lime products also make a significant contribution to precipitation and purification by removing dissolved substances such as phosphates, heavy metals and organic residues. This ensures clean production processes and reduces environmental impact. Precipitated calcium carbonate (PCC) is used as an optical and functional filler in paper finishing to optimise the final product’s properties such as opacity, whiteness, smoothness, printability and brightness.
Product solutions – tailored to the paper industry
The optimal product selection depends on your target values and requirements. Our sales staff will be happy to advise you on selecting the right product.
- High-purity calcium oxides and hydroxides (fine lime, micronized lime, hydrated lime) for chemical processes in pulp production and precise pH control.
- Precipitated calcium carbonate PCC (CALPREC PA) is used as a filler in paper to increase volume and porosity while achieving significantly higher whiteness and opacity.
