Method for controlling the crystal growth, the filterability and the dewaterability of flue gas gypsum

摘要

The control of crystal growth rate, filterability and dewaterability of flue gas gypsum from wet flue gas desulphurisation plants in which coarse-grained flue gas gypsum is removed from the system via a hydrocyclone is carried out by removing at least some of the finer-grained solid particles from the suspension of the hydrocyclone overflow constantly or at intervals and recycling only the remaining aqueous phase of the suspension to the system.