How to purify waste plastic from (dirt, sand,metals and glasses) before entering the pyrolysis process to...

How to purify waste plastic from (dirt, sand,metals and glasses) before entering the pyrolysis process to increase its final efficiency ?

Expert Solution

there are large no. of technologies have been developed in order to select & sorting out of plastic wastes .

Plastic separation techniques may be manual or automated.

plastic waste can be separated by triboelectric separation.Which will help to differentiate between two plastic items by rubbing them to each other .In this method triboelectric separator separates different plastic materials on the basis of surface charge transfer phenomenon.This method include a high speed accelerator to eliminate shredded waste & the separated delimanated material by air classification ,sieve & Electrostatics .Using XRF techniques different type of flame retardants can also be identified .There is one issue faced by recycler of plastic in removal of paint coating on plastics.Grinding can be used to remove coatings .Another way is abrasion .Solvent stripping is also used to recyclers , which involves dipping plastic into suitable solvents.
waste can separated by shredding or cutting plastic waste parts by utilizing saw & for further processing.Separation of paper dust & other forms of impurities separated from plastic.different plastic can be separated in floating tank as per density .Washing & Drying of plastic is required.Chemical washing is also applied for removal of sticky substances on plastics.
there are various techniques & recycle process are available like mechanical recycling ,Chemical recycling etc.Material like glass, metal can be saparated on density difference this can also be done manually for coarse parts.

Amanda K answered 2 years ago

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