Process and plant for treating and recycling waste materials by changing them into recyclable, non-contaminated materials

摘要

According to the invention, a device (apparatus) for processing and upgrading previously ground waste (1) from which all possible ferrous metal parts have been removed and which has a water content lying within a given range, comprises a reaction chamber (21) allowing addition and reaction of mineralising elements, including at leat one alkaline-earth hydroxide such as quick lime and an alkaline-earth salt such as calcium carbonate, at a temperature greater than 130@C and less than the pyrolysis temperature of those constituents which are most sensitive to thermal decomposition. The said reaction chamber (21) comprises at least one continuous chute (16) containing at least one archimedes screw (15) which is driven in rotation therein, which chute comprises a plurality of successive chambers (22) into each of which one of the said mineralising elements is injected; the said archimedes screw (15) on the one hand ensures continuous, intimate homogeneous mixing of the ground material and these mineralising reactants added and, on the other hand, keeps the particle size less than 1 mm. IMAGE