Explanatory notes
… acid, etc.). When spent, it contains a mixture of sulphur, Prussian blue, a small quantity of ammonium salts … a disagreeable odour, and is mainly used as a source of sulphur and cyanides (particularly Prussian blue) and as a … off-gases by so called limestone gypsum flue gas desulphurisation (LG FGD). These residues are solid or in the …