Förfarande för minskning av urlakning av ett kornigt ämne och ett kornigt ämne erhållet genom användning av förfarandet

摘要

This invention relates to a method for reducing the leachability of granular material, which essentially consists of an inorganic binder and a filler, which contains contaminants. According to the invention the granular material prepared is coated with a closed coating of water-insoluble and water-repellent material. Said coating (2) being preferably a watertight and/or water-repellent polymer composition.