Patent ID: 7185835

Claim:
A process for the granulation of sludge- and/or dust-form material, comprising the steps of: mixing the sludge- and/or dust-form material with water and solids selected from the group of solids consisting of: hydratable solids and hydraulically settable solids, the hydratable or hydraulically settable solids reacting exothermically with the water and acting as binders in the mixture, where the solids are allowed to at least partially hydrate or set, and shaping the mixture containing the at least partially hydrated or set solids into granules, the step of mixing the sludge- and/or dust form material comprising: wetting with the water at least the solids, the solids being subsequently or essentially at the same time mixed with the material to be granulated, sufficient water being added to the solids for establishing a temperature which supports further drying out of unreacted water during the mixing step or the mixing and shaping steps.