INCOPA is the European Inorganic Coagulants Producers Association
Inorganic coagulants are aluminium and iron salts; elements essential for water treatment, paper manufacturing, cement industry and fertiliser production. They are naturally occurring and afford safe drinking water to billions the world over.
INCOPA’s members manufacture inorganic coagulants (aluminium and iron salts) which are used to purify drinking water, treat wastewater, and create vital products such as cement, fertilisers and paper.
Inorganic coagulants are used in two critical parts of the paper production process: sizing and retention.
Sizing controls the amount of liquid the cellulosic fibres in paper can absorb. Appropriate sizing regulates the amount of ink or water that can penetrate into the paper. Without it, our printed papers would end-up a soggy mass.
A combination of aluminium salts and organic compounds have been used to control the amount of sizing in paper since the 1800s. Aluminium sulfate was initially used, but it was replaced in the 1990s by poly aluminium chloride (PAC).
Retention is a papermaking term which describes the process of separating fibres from water to form a paper sheet. Good retention is essential for economical and quick paper production.
Retention is one of the most controlled parameters in the papermaking process. Improving retention reduces the amount of papermaking compounds, fibres and fillers in the waste water and improves profitability.
To increase fibre and filler retention, aluminium salts, sodium aluminate (SAL) and poly aluminium chloride (PAC) are used. Aluminium salts enhance the effect of other process chemicals (for example, poly-electrolytes) and remove unwanted anionic trash.