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Contenuto archiviato il 2022-12-27

RECYCLING AND REUTILIZATION OF HETEROGENEOUS PLASTIC WASTES WITH MATERIAL AND ENERGY RECOVERY

Obiettivo

Reutilization of plastic wastes from different sources (mainly industrial wastes) for the production of raw plastic material and finished products with energy recovery.
The plant produces a compound whose specifications are the average of those of the components used, and can be adjusted as required according to the use of the end product. From the economic point of view the process shows an overall profitability (payback time 1.6 yr). It also recovers energy from materials which would otherwise be wasted and it reduces the volume of waste which would otherwise contribute to pollution. The "Revive" plant can be copied on different scales as required and the system could be used at solid urban waste collection and disposal plants and by industries which generate heterogeneous and multibonded plastic scrap. There are many different types of polymers which can be used and mixed without the need for any preselection : PEHD - PELD - reticulated PE - PE + cellulose - PP - PP + plant fibres - PP + mineral fibres - PP + elastomers - PP + AL - rigid PVC - flexible PVC - pressed PVC - PS - shockabsorbing PS - PET - PC - PUR - ABS - AM - PA6 - PA6 + mineral fibres - PA11 - PA11 + mineral fibres. These can be recycled even if they are mixed with iron filings, sheet metal, textiles, powder, sawdust, thermosetting materials, elastomers, cellulose, etc. The various components have been used in different combinations and in different proportions as they normally occur in waste. Results with homogenizing various polymers were found to be particularly good if processes were balanced and gradients were low, i.e. there were no drastic changes of temperature, compression and friction of the mass which might accentuate or cause breaking of the molecular chains resulting in the agglomeration and separation of the actual elements. The plant currently has a line which can recycle 1000 tonnes of heterogeneous plastic scrap and waste a year. There are plans to increase plant capacity so that it can recycle 3000 tonnes per year. In the plant it is possible to have three lines of en products. These three lines may be used either as alternatives orin combination :
line 1 - alternately collects the material and compacts it to make large products
line 2 - collects material continuously and forms it into long products
line 3 - cuts the material into cube-shaped chips for injection moulding.
From the homogenized compound it is possible to obtain :
Line 1 - compacting in ordinary moulds : blocks and kerbs for use in road building, flooring, protective sheaths for cables and pipes, laths, props, panelling, seating, road edging, benches, etc..
Line 2 - shaping into sections : fencing, posts, crash barriers, stakes for use in agriculture and fish farming, gates, etc..
Line 3 - chips for injection moulding : devices for cleaning water and rivers, plant pots, containers, boxes, drain covers, gratings, etc..
When assessing the energy saving and economic benefits of the "Revive" process, it is important not ot overlook the socio-economic and environmental benefits of this technology, which are very difficult to quantify but are certainly positive.
The aim of the project is to treat 1 000 tonnes of plastic scrap and waste a year, 900 tonnes of it being industrial scrap and 100 tonnes urban waste. The plastic waste is ground in a disc mill with a capacity of 250 kg/h. After grinding the material is stored in a hopper from which it is sucked into a mixing unit which turns it into a mixture of plastic chips meeting predetermined specifications.
These chips then pass into a homogenizer, which, together with the mixing unit, constitutes the heart of the REVIVE system, where, by applying the right pressure and heat, the material fuses into a homogeneous product which may either be granulated or used as it is to produce moulded components. At the end of the line is a dieing machine and the auxillary equipment required to control the process, which in future will be fully automated.
Operating at full capacity, this production line will save energy totalling 2070 TOE a year.
The project includes all the operations necessary for efficient and economic installation and operation of the plant on an industrial scale and to ensure that the specifications of the products are as close as possible to customers' requirements.

Invito a presentare proposte

Data not available

Meccanismo di finanziamento

DEM - Demonstration contracts

Coordinatore

Cadauta SaS
Contributo UE
Nessun dato
Indirizzo
Via Torino
10020 San Sebastiano da Po
Italia

Mostra sulla mappa

Costo totale
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