TREATMENT OF IRON-AND-STEEL PLANT SLUDGE IN A MULTISTAGE FURNACE

摘要

The invention concerns a method for treating iron-and-steel plant sludge comprising adjusting the available CaO content of the sludge so as to obtain an available CaO content of 3 % to 8 % based on the sludge weight, adding a carbon-containing fuel, introducing the sludge onto one of the upper stages of a multistage furnace, heating the multistage furnace, gradually transferring the sludge onto the lower stages, and adjusting the temperature of the exhaust gases of the multistage furnace to at least 500 °C and that of the treated sludge at the output of the multistage furnace to a temperature ranging between 700 °C and 800 °C.