The Experts below are selected from a list of 1659 Experts worldwide ranked by ideXlab platform
Lucian Dascalescu - One of the best experts on this subject based on the ideXlab platform.
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Electrostatic Separation of Plastic Materials Recycled from End of Life Vehicles
2020Co-Authors: Robert T. Toth, Adrian Oprean, Adrian Samuila, Lucian Dascalescu, Viorica Saplontai, Matei Gheorghe, Ileana CojocaruAbstract:The study was conducted on a powdery mixture derived from mechanical processing of plastics recovered from the instrument panels of ELVs, which contain varying amounts of polypropylene (PP), acrylonitrile butadiene styrene (ABS), polycarbonate (PC),cardboard, rubber, and other materials. The mixture was deposited on a metallic belt-type electrode that introduced them into an area of high intensity electric field created by a rotating cylindrical electrode, connected to a high voltage supply. This Electrostatic Separation method in association with classical waste processing techniques is a viable solution for the ELVs recycling industry.
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Effect of ambient humidity on the outcome of Electrostatic Separation processes
2020Co-Authors: Lucian Dascalescu, Karim Medles, Amar Tilmatine, A. Mihalcioiu, Adrian SamuilaAbstract:Taguchi's methodology has already been applied to the robust design of an Electrostatic Separation processes the outcome of which was affected by two hard-to-control noise factors: granule size and composition of the materials to be selectively sorted. The aim of the present work was to expand that investigation to an additional noise factor: the relative humidity of ambient air. The objective was to reduce variation in the process outcome by finding operating conditions (high-voltage level, roll speed, splitter position), under which uncontrollable variation in noise factors (ambient humidity, copper content in the feed) has minimal impact on the quantity (mass of middling fraction) and the quality (purity of the copper fraction) of the recovered products. The experiments were carried out on a laboratory roll-type Electrostatic separator. The samples of processed material were prepared from genuine chopped electric wire wastes (granule size > 1mm and < 2 mm) containing various proportions of copper (5%, 25%, and 45 %) and PVC. The ambient relative humidity varied between 40 and 60%, at a temperature of 20 ± 1°C. The design and noise factors were first analyzed using a classical Taguchi approach, then combined into one single experimental design, so that a regression model of the process be fitted. Several additional experiments at lower (30%) or higher (70%) relative humidity have been performed, to asses the feasibility of Electrostatic Separation in less standard environmental conditions. The conditions of industry application of Taguchi's methodology are discussed.
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Dielectric barrier discharge treatment of granular plastic mixtures in view of their tribo-Electrostatic Separation
IEEE Transactions on Industry Applications, 2019Co-Authors: Ahlem Benabderrahmane, Karim Medles, Amar Tilmatine, Thami Zeghloul, Gontran Richard, Lucian DascalescuAbstract:Successful Electrostatic Separation of granular plastic mixtures is strongly conditioned by the effective triboelectric charging of their constituents. The aim of this article is to demonstrate that appropriate exposure to a dielectric barrier discharge (DBD) at atmospheric pressure changes the triboelectric properties of plastics and favors their Separation under the action of electric field forces. The experiments were conducted with nine different plastics originating from waste electric and electronic equipment [acrylonitrile butadiene styrene, high-impact polystyrene (HIPS), polycarbonate (PC), Cristal PC, polyethylene (PE), polypropylene (PP), polystyrene (PS), Cristal PS, and polyvinyl chloride (PVC)] using a rotating cylinder tribocharging device and a roll-type Electrostatic separator. The cylinder of the device was made of either high-density PE or PVC. The comparison between the results of triboelectric charging and Electrostatic Separation of DBD-exposed and unexposed granules pointed out the effectiveness of nonthermal plasma treatment of the plastic wastes. Most of DBD-exposed granules acquire a negative charge, whereas the majority of the plastics considered in this study got positively charged, if not pretreated in the nonthermal plasma reactor. The modifications the DBD exposure induces on the triboelectric series highly affect the Electrostatic Separation of six different mixtures (PE–HIPS, PE–PP, PE–PVC, PP–HIPS, PP–PVC, and PVC–HIPS).
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Tribo-Electrostatic Separation of a quaternary granular mixture of plastics
Particulate Science and Technology, 2018Co-Authors: Radjaa Messafeur, Karim Medles, Lucian Dascalescu, Imene Nassima Mahi, Rabah Ouiddir, Amar TilmatineAbstract:ABSTRACTMany tribo-Electrostatic Separation studies of binary mixtures of millimeter-sized plastic particles have been performed. The objective of this work is an experimental investigation for sep...
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Numerical simulation of a tribo-aero-Electrostatic Separation of a ternary plastic granular mixture
Journal of Electrostatics, 2017Co-Authors: Chahinez Mimouni, Amar Tilmatine, Fatima Zohra Rahou, Lucian DascalescuAbstract:Abstract Granular materials, when fluidized by air or other gaseous medium, acquire Electrostatic charge by particle-particle and particle-wall collisions. The effectiveness of particle tribocharging achieved with such fluidization process is crucial for establishing the feasibility of Electrostatic Separation of mixed granular solid wastes in the recycling industry. The aim of the present work is to introduce a simple mathematical model for simulating the outcome of a novel tribo-aero-Electrostatic Separation process involving mixture of three granular materials. The process is characterized by the fact that the charging of the granules is produced in a fluidized bed device, in the presence of an electric field. The mathematical model in this case assumed that the probability of a granule to be separated can be expressed using the normal distribution law, as a function of the number of impacts with granules belonging to the other classes of materials. The effect of the presence of a third species of particles was taken into account. Thus, it was possible to calculate the evolution over time of the mass of granules separated at the electrodes for different compositions of the granular mixture. The calculated results are in good agreement with the experiments.
Zhenming Xu - One of the best experts on this subject based on the ideXlab platform.
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Charge-decay Electrostatic Separation for removing Polyvinyl chloride from mixed plastic wastes
Journal of Cleaner Production, 2017Co-Authors: Jia Li, Kai Gao, Zhenming XuAbstract:An innovative recycling method charge-decay Electrostatic Separation (CDES) has been developed to remove PVC from mixed plastic wastes. According to the charge-decay properties experiments of ABS, PP, and PVC, three charge-decay patterns were found. Computer simulation was used to investigate Separation possibility. The differences in the charge-decay properties of different non-conductors provided the technical basis for developing the CDES. The Separation resulted by virgin mixed plastics indicated that long decay time was beneficial to remove PVC from ABS or PP. The PVC removal rate increased from 50% to 100% with the increased decay time. When separating mixed plastic wastes from waste refrigerator, the purity of PVC can reach 96% and removal rate was 99% after single round separating. The Separation condition was set as following: voltage of corona-Electrostatic electrode (V1) = −20 kV, voltage of round Electrostatic electrode (V2) = 20 kV, decay times (t) = 300s. CDES is a promising way to separate mixed materials with difference in charge-decay rate.
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tribo charging properties of waste plastic granules in process of tribo Electrostatic Separation
Waste Management, 2015Co-Authors: Jia Li, Guiqing Wu, Zhenming XuAbstract:Abstract Plastic products can be found everywhere in people’s daily life. With the consistent growth of plastic consumption, more and more plastic waste is generated. Considering the stable chemical and physics characteristics of plastic, regular waste management methods are not suitable for recycling economic strategy of each government, which has become a serious environmental problem. Recycling plastic waste is considered to be the best way to treat it, because it cannot only deduce the waste but also save the energy to produce new virgin plastic. Tribo-Electrostatic Separation is strongly recommended for plastic Separation as it can preserve the original properties of plastic and has little additional pollution. In this study, plastic granules are generated by crushing plastic waste in waste electric and electronic equipment. The tribo-charging properties of plastic waste were studied by vibrating tribo-charging and cyclone tribo-charging. The triboelectric series obtained by vibrating was: (−)-PE–PS–PC–PVC–ABS–PP-(+), while the triboelectric series obtained by cyclone was (−)-PE–PS–PC–PVC–ABS–PP-(+). Further, the cyclone charging was more effective and stable than vibrating charging. The impact factors experiments showed that small particle size was better changed than large ones and were more suitable recycled by tribo-Electrostatic Separation. High relative humidity was identified as impede charging effect. The results of this study will help defining the operating parameters of subsequent separator.
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Electrostatic Separation for recycling conductors semiconductors and nonconductors from electronic waste
Environmental Science & Technology, 2012Co-Authors: Jia Li, Zhenming XuAbstract:Electrostatic Separation has been widely used to separate conductors and nonconductors for recycling e-waste. However, the components of e-waste are complex, which can be classified as conductors, semiconductors, and nonconductors according to their conducting properties. In this work, we made a novel attempt to recover the mixtures containing conductors (copper), semiconductors (extrinsic silicon), and nonconductors (woven glass reinforced resin) by Electrostatic Separation. The results of binary mixtures Separation show that the Separation of conductor and nonconductor, semiconductor and nonconductor need a higher voltage level while the Separation of conductor and semiconductor needs a higher roll speed. Furthermore, the semiconductor Separation efficiency is more sensitive to the high voltage level and the roll speed than the conductor Separation efficiency. An integrated process was proposed for the multiple mixtures Separation. The Separation efficiency of conductors and semiconductors can reach 82....
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Electrostatic Separation for recycling conductors, semiconductors, and nonconductors from electronic waste
Environmental Science and Technology, 2012Co-Authors: Mianqiang Xue, Guoqing Yan, Jia Li, Zhenming XuAbstract:Electrostatic Separation has been widely used to separate conductors and nonconductors for recycling e-waste. However, the components of e-waste are complex, which can be classified as conductors, semiconductors, and nonconductors according to their conducting properties. In this work, we made a novel attempt to recover the mixtures containing conductors (copper), semiconductors (extrinsic silicon), and nonconductors (woven glass reinforced resin) by Electrostatic Separation. The results of binary mixtures Separation show that the Separation of conductor and nonconductor, semiconductor and nonconductor need a higher voltage level while the Separation of conductor and semiconductor needs a higher roll speed. Furthermore, the semiconductor Separation efficiency is more sensitive to the high voltage level and the roll speed than the conductor Separation efficiency. An integrated process was proposed for the multiple mixtures Separation. The Separation efficiency of conductors and semiconductors can reach 82.5% and 88%, respectively. This study contributes to the efficient recycling of valuable resources from e-waste.
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Electrostatic Separation for recycling waste printed circuit board a study on external factor and a robust design for optimization
Environmental Science & Technology, 2010Co-Authors: Jiang Wu, Zhenming XuAbstract:Electrostatic Separation is an effective and environmentally friendly method for recycling waste printed circuit board (PCB) by several kinds of Electrostatic separators. However, some notable problems have been detected in its applications and cannot be efficiently resolved by optimizing the Separation process. Instead of the separator itself, these problems are mainly caused by some external factors such as the nonconductive powder (NP) and the superficial moisture of feeding granule mixture. These problems finally lead to an inefficient Separation. In the present research, the impacts of these external factors were investigated and a robust design was built to optimize the process and to weaken the adverse impact. A most robust parameter setting (25 kv, 80 rpm) was concluded from the experimental design. In addition, some theoretical methods, including cyclone Separation, were presented to eliminate these problems substantially. This will contribute to efficient Electrostatic Separation of waste PCB an...
Jia Li - One of the best experts on this subject based on the ideXlab platform.
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Charge-decay Electrostatic Separation for removing Polyvinyl chloride from mixed plastic wastes
Journal of Cleaner Production, 2017Co-Authors: Jia Li, Kai Gao, Zhenming XuAbstract:An innovative recycling method charge-decay Electrostatic Separation (CDES) has been developed to remove PVC from mixed plastic wastes. According to the charge-decay properties experiments of ABS, PP, and PVC, three charge-decay patterns were found. Computer simulation was used to investigate Separation possibility. The differences in the charge-decay properties of different non-conductors provided the technical basis for developing the CDES. The Separation resulted by virgin mixed plastics indicated that long decay time was beneficial to remove PVC from ABS or PP. The PVC removal rate increased from 50% to 100% with the increased decay time. When separating mixed plastic wastes from waste refrigerator, the purity of PVC can reach 96% and removal rate was 99% after single round separating. The Separation condition was set as following: voltage of corona-Electrostatic electrode (V1) = −20 kV, voltage of round Electrostatic electrode (V2) = 20 kV, decay times (t) = 300s. CDES is a promising way to separate mixed materials with difference in charge-decay rate.
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tribo charging properties of waste plastic granules in process of tribo Electrostatic Separation
Waste Management, 2015Co-Authors: Jia Li, Guiqing Wu, Zhenming XuAbstract:Abstract Plastic products can be found everywhere in people’s daily life. With the consistent growth of plastic consumption, more and more plastic waste is generated. Considering the stable chemical and physics characteristics of plastic, regular waste management methods are not suitable for recycling economic strategy of each government, which has become a serious environmental problem. Recycling plastic waste is considered to be the best way to treat it, because it cannot only deduce the waste but also save the energy to produce new virgin plastic. Tribo-Electrostatic Separation is strongly recommended for plastic Separation as it can preserve the original properties of plastic and has little additional pollution. In this study, plastic granules are generated by crushing plastic waste in waste electric and electronic equipment. The tribo-charging properties of plastic waste were studied by vibrating tribo-charging and cyclone tribo-charging. The triboelectric series obtained by vibrating was: (−)-PE–PS–PC–PVC–ABS–PP-(+), while the triboelectric series obtained by cyclone was (−)-PE–PS–PC–PVC–ABS–PP-(+). Further, the cyclone charging was more effective and stable than vibrating charging. The impact factors experiments showed that small particle size was better changed than large ones and were more suitable recycled by tribo-Electrostatic Separation. High relative humidity was identified as impede charging effect. The results of this study will help defining the operating parameters of subsequent separator.
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Electrostatic Separation for recycling conductors semiconductors and nonconductors from electronic waste
Environmental Science & Technology, 2012Co-Authors: Jia Li, Zhenming XuAbstract:Electrostatic Separation has been widely used to separate conductors and nonconductors for recycling e-waste. However, the components of e-waste are complex, which can be classified as conductors, semiconductors, and nonconductors according to their conducting properties. In this work, we made a novel attempt to recover the mixtures containing conductors (copper), semiconductors (extrinsic silicon), and nonconductors (woven glass reinforced resin) by Electrostatic Separation. The results of binary mixtures Separation show that the Separation of conductor and nonconductor, semiconductor and nonconductor need a higher voltage level while the Separation of conductor and semiconductor needs a higher roll speed. Furthermore, the semiconductor Separation efficiency is more sensitive to the high voltage level and the roll speed than the conductor Separation efficiency. An integrated process was proposed for the multiple mixtures Separation. The Separation efficiency of conductors and semiconductors can reach 82....
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newly patented technical solutions for improving the tribo Electrostatic Separation of mixed granular solids
Recent Patents on Engineering, 2012Co-Authors: Jia Li, Lucian DascalescuAbstract:The tribo-electric effect consists in the electrification of certain materials after coming into contact with other materials. This effect may be used in conjunction with the electric field forces for Electrostatically separating positively- and negatively-tribo-charged granules that have otherwise similar size, density, magnetic properties and electric conduc- tivities. Although tribo-Electrostatic Separation has been used for a long time, its larger-scale application is hampered by a multitude of technical problems that need to be solved: sensitivity to environmental conditions, non-homogeneity of mate- rial charging, chaotic particle trajectories, electrode clogging, etc. This paper reviews various recent patents that claim in- novative solutions of these problems, allowing increasing efficiency and robustness of the Separation. The improvements concern each phase of the process: (i) pretreatment and feeding; (ii) tribo-charging of the materials to be separated; (iii) Electrostatic Separation and particle collection. Most of the new applications were developed for the recycling of plastics from industrial waste and the recovery of unburned carbon from fly ash. The paper concludes with a description of the fu- ture developments expected in the field of tribo-Electrostatic Separation.
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Electrostatic Separation for recycling conductors, semiconductors, and nonconductors from electronic waste
Environmental Science and Technology, 2012Co-Authors: Mianqiang Xue, Guoqing Yan, Jia Li, Zhenming XuAbstract:Electrostatic Separation has been widely used to separate conductors and nonconductors for recycling e-waste. However, the components of e-waste are complex, which can be classified as conductors, semiconductors, and nonconductors according to their conducting properties. In this work, we made a novel attempt to recover the mixtures containing conductors (copper), semiconductors (extrinsic silicon), and nonconductors (woven glass reinforced resin) by Electrostatic Separation. The results of binary mixtures Separation show that the Separation of conductor and nonconductor, semiconductor and nonconductor need a higher voltage level while the Separation of conductor and semiconductor needs a higher roll speed. Furthermore, the semiconductor Separation efficiency is more sensitive to the high voltage level and the roll speed than the conductor Separation efficiency. An integrated process was proposed for the multiple mixtures Separation. The Separation efficiency of conductors and semiconductors can reach 82.5% and 88%, respectively. This study contributes to the efficient recycling of valuable resources from e-waste.
Amar Tilmatine - One of the best experts on this subject based on the ideXlab platform.
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Effect of ambient humidity on the outcome of Electrostatic Separation processes
2020Co-Authors: Lucian Dascalescu, Karim Medles, Amar Tilmatine, A. Mihalcioiu, Adrian SamuilaAbstract:Taguchi's methodology has already been applied to the robust design of an Electrostatic Separation processes the outcome of which was affected by two hard-to-control noise factors: granule size and composition of the materials to be selectively sorted. The aim of the present work was to expand that investigation to an additional noise factor: the relative humidity of ambient air. The objective was to reduce variation in the process outcome by finding operating conditions (high-voltage level, roll speed, splitter position), under which uncontrollable variation in noise factors (ambient humidity, copper content in the feed) has minimal impact on the quantity (mass of middling fraction) and the quality (purity of the copper fraction) of the recovered products. The experiments were carried out on a laboratory roll-type Electrostatic separator. The samples of processed material were prepared from genuine chopped electric wire wastes (granule size > 1mm and < 2 mm) containing various proportions of copper (5%, 25%, and 45 %) and PVC. The ambient relative humidity varied between 40 and 60%, at a temperature of 20 ± 1°C. The design and noise factors were first analyzed using a classical Taguchi approach, then combined into one single experimental design, so that a regression model of the process be fitted. Several additional experiments at lower (30%) or higher (70%) relative humidity have been performed, to asses the feasibility of Electrostatic Separation in less standard environmental conditions. The conditions of industry application of Taguchi's methodology are discussed.
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Dielectric barrier discharge treatment of granular plastic mixtures in view of their tribo-Electrostatic Separation
IEEE Transactions on Industry Applications, 2019Co-Authors: Ahlem Benabderrahmane, Karim Medles, Amar Tilmatine, Thami Zeghloul, Gontran Richard, Lucian DascalescuAbstract:Successful Electrostatic Separation of granular plastic mixtures is strongly conditioned by the effective triboelectric charging of their constituents. The aim of this article is to demonstrate that appropriate exposure to a dielectric barrier discharge (DBD) at atmospheric pressure changes the triboelectric properties of plastics and favors their Separation under the action of electric field forces. The experiments were conducted with nine different plastics originating from waste electric and electronic equipment [acrylonitrile butadiene styrene, high-impact polystyrene (HIPS), polycarbonate (PC), Cristal PC, polyethylene (PE), polypropylene (PP), polystyrene (PS), Cristal PS, and polyvinyl chloride (PVC)] using a rotating cylinder tribocharging device and a roll-type Electrostatic separator. The cylinder of the device was made of either high-density PE or PVC. The comparison between the results of triboelectric charging and Electrostatic Separation of DBD-exposed and unexposed granules pointed out the effectiveness of nonthermal plasma treatment of the plastic wastes. Most of DBD-exposed granules acquire a negative charge, whereas the majority of the plastics considered in this study got positively charged, if not pretreated in the nonthermal plasma reactor. The modifications the DBD exposure induces on the triboelectric series highly affect the Electrostatic Separation of six different mixtures (PE–HIPS, PE–PP, PE–PVC, PP–HIPS, PP–PVC, and PVC–HIPS).
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Tribo-Electrostatic Separation of a quaternary granular mixture of plastics
Particulate Science and Technology, 2018Co-Authors: Radjaa Messafeur, Karim Medles, Lucian Dascalescu, Imene Nassima Mahi, Rabah Ouiddir, Amar TilmatineAbstract:ABSTRACTMany tribo-Electrostatic Separation studies of binary mixtures of millimeter-sized plastic particles have been performed. The objective of this work is an experimental investigation for sep...
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Numerical simulation of a tribo-aero-Electrostatic Separation of a ternary plastic granular mixture
Journal of Electrostatics, 2017Co-Authors: Chahinez Mimouni, Amar Tilmatine, Fatima Zohra Rahou, Lucian DascalescuAbstract:Abstract Granular materials, when fluidized by air or other gaseous medium, acquire Electrostatic charge by particle-particle and particle-wall collisions. The effectiveness of particle tribocharging achieved with such fluidization process is crucial for establishing the feasibility of Electrostatic Separation of mixed granular solid wastes in the recycling industry. The aim of the present work is to introduce a simple mathematical model for simulating the outcome of a novel tribo-aero-Electrostatic Separation process involving mixture of three granular materials. The process is characterized by the fact that the charging of the granules is produced in a fluidized bed device, in the presence of an electric field. The mathematical model in this case assumed that the probability of a granule to be separated can be expressed using the normal distribution law, as a function of the number of impacts with granules belonging to the other classes of materials. The effect of the presence of a third species of particles was taken into account. Thus, it was possible to calculate the evolution over time of the mass of granules separated at the electrodes for different compositions of the granular mixture. The calculated results are in good agreement with the experiments.
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IAS - Recovery of water bottles plastic using tribo-Electrostatic Separation process
2015 IEEE Industry Applications Society Annual Meeting, 2015Co-Authors: Rabah Ouiddir, Karim Medles, Amar Tilmatine, Abdelber Bendaoud, Mohamed El-mouloud Zelmat, Lucian DascalescuAbstract:The recycling of plastic materials is considered nowadays as a major strategic issue, since several million tons of plastic are the subject of recovery and recycling. The consumption of plastics in African countries is continuously growing up and the need of low-cost recycling methods is becoming more pressing. The purpose of this paper is an experimental investigation for recycling of plastic waste from PET water bottles using the free-fall Electrostatic Separation device. Water bottles are manufactured with two kinds of plastic, PET (Polyethylene terephthalate) and HDPE (High-density polyethylene), are first crushed into 2–3 mm size particles. Triboelectric charging of the granules was performed using a fluidized air device build-up with a plastic located between PET and HDPE in the triboelectric series. Due to the plate-shape of the particles, the free-fall tribo-Electrostatic separator is efficient in terms of recovery and purity of the separated products.
Karim Medles - One of the best experts on this subject based on the ideXlab platform.
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Effect of ambient humidity on the outcome of Electrostatic Separation processes
2020Co-Authors: Lucian Dascalescu, Karim Medles, Amar Tilmatine, A. Mihalcioiu, Adrian SamuilaAbstract:Taguchi's methodology has already been applied to the robust design of an Electrostatic Separation processes the outcome of which was affected by two hard-to-control noise factors: granule size and composition of the materials to be selectively sorted. The aim of the present work was to expand that investigation to an additional noise factor: the relative humidity of ambient air. The objective was to reduce variation in the process outcome by finding operating conditions (high-voltage level, roll speed, splitter position), under which uncontrollable variation in noise factors (ambient humidity, copper content in the feed) has minimal impact on the quantity (mass of middling fraction) and the quality (purity of the copper fraction) of the recovered products. The experiments were carried out on a laboratory roll-type Electrostatic separator. The samples of processed material were prepared from genuine chopped electric wire wastes (granule size > 1mm and < 2 mm) containing various proportions of copper (5%, 25%, and 45 %) and PVC. The ambient relative humidity varied between 40 and 60%, at a temperature of 20 ± 1°C. The design and noise factors were first analyzed using a classical Taguchi approach, then combined into one single experimental design, so that a regression model of the process be fitted. Several additional experiments at lower (30%) or higher (70%) relative humidity have been performed, to asses the feasibility of Electrostatic Separation in less standard environmental conditions. The conditions of industry application of Taguchi's methodology are discussed.
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Dielectric barrier discharge treatment of granular plastic mixtures in view of their tribo-Electrostatic Separation
IEEE Transactions on Industry Applications, 2019Co-Authors: Ahlem Benabderrahmane, Karim Medles, Amar Tilmatine, Thami Zeghloul, Gontran Richard, Lucian DascalescuAbstract:Successful Electrostatic Separation of granular plastic mixtures is strongly conditioned by the effective triboelectric charging of their constituents. The aim of this article is to demonstrate that appropriate exposure to a dielectric barrier discharge (DBD) at atmospheric pressure changes the triboelectric properties of plastics and favors their Separation under the action of electric field forces. The experiments were conducted with nine different plastics originating from waste electric and electronic equipment [acrylonitrile butadiene styrene, high-impact polystyrene (HIPS), polycarbonate (PC), Cristal PC, polyethylene (PE), polypropylene (PP), polystyrene (PS), Cristal PS, and polyvinyl chloride (PVC)] using a rotating cylinder tribocharging device and a roll-type Electrostatic separator. The cylinder of the device was made of either high-density PE or PVC. The comparison between the results of triboelectric charging and Electrostatic Separation of DBD-exposed and unexposed granules pointed out the effectiveness of nonthermal plasma treatment of the plastic wastes. Most of DBD-exposed granules acquire a negative charge, whereas the majority of the plastics considered in this study got positively charged, if not pretreated in the nonthermal plasma reactor. The modifications the DBD exposure induces on the triboelectric series highly affect the Electrostatic Separation of six different mixtures (PE–HIPS, PE–PP, PE–PVC, PP–HIPS, PP–PVC, and PVC–HIPS).
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IAS - Experimental study of a new tribocharging device for the Electrostatic Separation of mixed granular insulating materials
2019 IEEE Industry Applications Society Annual Meeting, 2019Co-Authors: Mohamed Fodil Boukhoulda, Karim Medles, Mohammed Rezoug, Wessim Aksa, Imed Eddine Achouri, Thami ZeghloulAbstract:Recycling of waste plastics is a coRecycling of waste plastics is a complex process, which often includes an operation of Electrostatic Separation, the efficiency of which depends on the electric charge carried by the particles. The present work is aimed at evaluating the performances of a new multi-cylinder-type tribocharger for granular plastics (size: 3 mm to 5 mm). The design of the device ensures a quasi-permanent particle-wall friction that improves the tribocharging efficiency. The experiments were carried out using PVC as material for the tribocharging cylinders and involved nine different polymers. Charge per mass ratios higher than 10 nC/g were obtained for PC and ABS particles, i.e. a level of charge that is adequate for Electrostatic Separation.
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Experimental study of a new tribocharging device for the Electrostatic Separation of mixed granular insulating materials
2019 IEEE Industry Applications Society Annual Meeting, 2019Co-Authors: Mohamed Fodil Boukhoulda, Karim Medles, Mohammed Rezoug, Wessim Aksa, Imed Eddine Achouri, Thami ZeghloulAbstract:Recycling of waste plastics is a coRecycling of waste plastics is a complex process, which often includes an operation of Electrostatic Separation, the efficiency of which depends on the electric charge carried by the particles. The present work is aimed at evaluating the performances of a new multi-cylinder-type tribocharger for granular plastics (size: 3 mm to 5 mm). The design of the device ensures a quasi-permanent particle-wall friction that improves the tribocharging efficiency. The experiments were carried out using PVC as material for the tribocharging cylinders and involved nine different polymers. Charge per mass ratios higher than 10 nC/g were obtained for PC and ABS particles, i.e. a level of charge that is adequate for Electrostatic Separation.
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Tribo-Electrostatic Separation of a quaternary granular mixture of plastics
Particulate Science and Technology, 2018Co-Authors: Radjaa Messafeur, Karim Medles, Lucian Dascalescu, Imene Nassima Mahi, Rabah Ouiddir, Amar TilmatineAbstract:ABSTRACTMany tribo-Electrostatic Separation studies of binary mixtures of millimeter-sized plastic particles have been performed. The objective of this work is an experimental investigation for sep...