Patent EA-001735-B1 (EA)
Title: Process for the cold transformation of municipal refuses and/or sludge into inert materials, plant for carrying out said process and products obtained
Inventor: BARNABEI RAFFAAELLO
IPC: B09B3/00
Filed: 1997-05-07
Abstract: 1. Process for the cold transformation of urban solid refuses (USR) and/or sludge into inert materials, comprising the steps of: - feeding USR and/or sludge from respective feeding lines; - introducing the materials within a micronizer in order to reduce the granulometry and to recover water contained therein; - adding CaO in an amount between 5 and 10% in weight of the main component; - adding CaCO3 in an amount between 5 and 10% in weight of the main component; - adding a polymeric additive in an amount between 3 and 10% in weight of the main component; - conveying the product to the shaping and stocking step. 2. Process according to claim 1, characterized in that said polymeric additive is chosen among vinyl poliacetate and its derivatives, polyurethane and its derivatives, and a styrene polymer and its derivatives. 3. Process according to one of the preceding claims, characterized in that along the USR feeding line there arranged a deferrization device, with mechanical compressor for the scraps, a main coarse triturator, particularly having four cores cutting hammers. 4. Process according to one of the preceding claims, characterized in that downstream said main triturator and upstream said micronizer, a rotating deferrization device with collection comb and a rotating sleeve, with coarse material recovery system and secondary triturator can be provided. 5. Process according to one of the preceding claims, characterized in that according to the invention, a water recovery tank can be provided downward the micronizer. 6. Process according to one of the preceding claims, characterized in that said product shaping line provides a granulates line, provided with a dehumidifier group and/or a manufactured product line, provided with a vibrating platform for the formwork. 7. Plant for the realisation of the process according to one of the preceding claims comprising, all or as partial combination: - at least one, preferably two, concrete sump to discharge USR (Urban Solid Refuses) and sludge, respectively; - at least one, preferably two overhead traveling crane provided with a fork to charge a conveyor band provided with a suitable tank; - a first horizontal conveyor band provided with charging tank to feed a triturator; - a deferrization device with scrap mechanical compressor above said first conveyor band; - a coarse main triturator with cutting hammers; - a second horizontal conveyor band provided with charging tank to feed the following screen; - a deferrization device provided with comb to collect fine objects; - an hexagonal rotating screen; - a third horizontal conveyor band under the screen, to collect the passing material to bring it to the mixers feeding bands; - a secondary cutting hammer triturator; - a fourth sloped conveyor band, suitable to bring to the material not-screened to the second crumbling, provided with sides all along its length, with charging tank, discharge casing and motor provided with a reduction gear; - a fifth horizontal conveyor band, suitable to transfer the crumbled material to the screen conveyor band; - a micronizer - heater with water recovery; - a sixth sloped conveyor band, suitable to transfer the micronized product to the charge and discharge hoppers; - a CaO (quicklime) reservoir; - a CaCO3 (calcium carbonate) reservoir; - a polymeric additive reservoir; - eventually a specific catalyst reservoir; further three conveyor bands, two of them being horizontally disposed and one being sloped, the latter being under hopper collection basins, to transfer the passing material to the mixers in an altemated way; - a blade tightness mixer provided with support, gangway, safety parapet, circular section discharge hopper, inspection openings, engine and reduction gear, inlet material weighing systems, additive nebulization system; - a tenth horizontal conveyor band, suitable to convey the passing material to an extruder; - an eleventh horizontal conveyor band, suitable to transfer the passing material to the manufactured products line.