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Over view of Electrostatic separation December 2007

Electrostatic Separation. Over view of Electrostatic separation December 2007. PROCESS.

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Over view of Electrostatic separation December 2007

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  1. Electrostatic Separation Over view of Electrostatic separation December 2007

  2. PROCESS In the Plastic-Separation patented process, chopped dry particles (5-8 mm size) are fed continuously into the upper end of a slightly charged, slowly rotating drum. As the particles tumble, they repeatedly contact the other particles in the drum causing an electrostatic charge to be developed by tribo-electrification. This is the same principle that can give you a small shock when you walk across a carpeted room in your socks.

  3. Process continued … • The polarity of the charge is determined by the chemical composition of each particle relative to the particles that it comes into contact with. The particles then fall through a strong electrostatic field • Negatively charged particles are drawn towards the positive electrode, positively charged particles toward the negative electrode. • Separated materials are drawn by auger from bins at the bottom of the separation tower. Material that is insufficiently pure can be recycled through the process.

  4. Flow of Plastics Grind various plastics Simplified system design for Electrostatic Separation Air blast paper away Wash Plastics Dry Plastics Electrostatic Separation Plastics separated into: PP, PE, PS, PVC, PET

  5. Plastic Separation Machine

  6. Equipment Specification • Input feed rate - 1 to 4 tonne per hour – washed, dry, granulated to 5 to 8 mm size • Electrical requirement - 1 kw for the separation unit and controls - 4 kw for materials handling equipment (augers) • Footprint - Equipment 5m by 1.5m with 5m ceiling Recommend minimum space of 8m x 8m to allow for materials handling and operator movement • Ambient Temperature - +60 to +80 ° F • Ambient Humidity - Maximum 50% RH

  7. Why separate mixed plastics? The value of separated plastics is much higher than the value of the mixed plastic.  This is a key benefit from the Plastic – Separation process. Using the process, you can turn what can be a liability (mixed plastics) into a significant revenue and profit stream.  If you are already separating plastics, you can increase your profit margins due to the high output purities and low operating costs inherent in the Plastic - Separation process. 

  8. Why choose our Plastic Separation Process? • Provides 92% - 99%+ separation purities in a single pass • Can meet any required product purity using multiple passes • Is most effective on binary mixtures, is also effective on multi-resin mixtures • 2000 lb per hour input - usable output up to 85% of input depending on purity requirements • Low cost operation enables profitable separation of commodity plastics such as polypropylene (PP) and polyvinyl chloride (PVC) • Robust, repeatable, controllable process tailored to high volume automated or semi-automated operation

  9. What types of plastics can be separated? Almost any plastic mixture can be separated using this process. A binary mixture of plastics will separate on the first pass through the machine in a high quality separation. A mixture containing more than 2 plastics will require 2 or more passes through the machine to achieve the desired purities.

  10. What purities can be achieved for the separated plastics? Purities above 99% have been achieved from an initial 50/50 binary mix of plastics in a single pass through the equipment with a yield of 80%.  With a 90/10 mix of PP/PE we have obtained a purity of 99.96% of PP with a yield of 85% in a single pass. With multiple passes any purity specifications can be met for the separated material. 

  11. To what degree are purity and yield interrelated? Purity and yield are the trade-off specifications in the separation process although all of the input material can be recovered as product. The higher the required purity, generally the lower the yield. Typically 80% yield can be achieved on a single separation of binary mixtures.  This means that for a 2200 lb per hour input stream, 1,760 lb per hour of useable material will be generated.  For mixtures where multiple passes through the equipment is required, machines can be cascaded to increase throughputs and hence overall process yield percentages. 

  12. What are the important process elements to control to achieve the best operating results? Surface contamination and moisture are the two factors which can lead to inconsistent separations. Materials to be separated must be clean and dry.  Particle size, and size variability are other important parameters to control.  It is important to control the quality of the plastics granules on the input side of the process.  Size, cleanliness and humidity are three important variables to control.  If these elements of the separation process are under tight process control, then the output streams will be consistent in quality.  The process is reliable, robust and repeatable. 

  13. What other equipment is required to ensure a fully operational separations line? Depending on the other process steps in your line, you may have to add materials handling equipment, size reduction equipment, storage bins, dryers and dust removal equipment.  We sell the equipment in two fashions: the basic separation unit together with a recommendation as to the appropriate ancillary equipment, or we can provide a complete, integrated, turnkey operation.  Post-Consumer Waste ProcessingUsing Plastic-Separation machines, together with float sink machinery, washers, dryers, grinders and materials handling equipment, the recycler is able to profitably turn unsorted municipal blue box waste into saleable product. 

  14. Are there any safety hazards from using the separation unit? The process is completely safe. The process is dry and uses no chemicals.

  15. What are the operating costs and maintenance costs? The energy requirement for processing 1 tonne of material per hour through the unit is about 1 kW per hour. An operator is needed to oversee the unit but could easily monitor two of the units.  In addition, there are costs for the preparation of the materials which may include grinding, washing and drying. It should be noted however, that these costs would be incurred for any process to reuse the material.

  16. Noteworthy Applications: PET PurificationThe high purity requirement (<10 ppm contaminants) is a key impediment to increased recycling of PET bottles. Use Plastic-Separation technology to purify recovered PET to the required level - inexpensively and reliably. PE/PP SeparationPE/PP mixtures are common whether as an outcome of a post-consumer recovery program or as an outcome of an industrial focused recovery program like the recycling of car batteries. Plastic-Separation technology enables the cost-effective separation of these plastics allowing the recycler to resell the separated PE and PP.

  17. Tyrone Plastics Recycling Company Managing Environmental Solutions Jim Butner and Dave McQuiggin 304 Spring Drive, Winston Salem, NC, 27107 Tel: 336 499 2111, Fax: 336 499 2086

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