Production of a ceramic product from contaminated silt comprises using heat from the carbonization of a high-calorie waste stream

摘要

Production of a ceramic product from contaminated silt by drying the silt, pelletizing the dried material and drying and sintering the pellets comprises using heat from the carbonization of a high-calorie waste stream in the drying and sintering steps Production of a ceramic product from silt contaminated with organic and/or inorganic materials comprises: (a) drying the silt, optionally together with other waste material, using heat from a flue gas stream produced by high-temperature gasification of off-gas from the carbonization of a high-calorie waste stream; (b) pelletizing the dried material; (c) drying the pellets using heat from part of the flue gas stream; (d) oxidizing and sintering the pellets using char from the carbonization step; (e) recycling the off-gas from the sintering step to the high-temperature gasification step; and (f) cooling the sintered product with air and using at least part of the resulting hot air in the carbonization step and/or the sintering step.