Development of electrostatic separator using cylindrical electrodes

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Abstract

In this paper, the results of experimental and analytical studies of the performance of a new electrostatic separator for plastic mixtures for recycling are presented. The separator is of the free fall type and consists of four cylindrical electrodes. Prior to separation, plastic mixtures to be separated are tribocharged. When the charged particles are fed into the center of the space between the four electrodes, they are attracted to the space between the electrodes with voltages of polarity opposite to the particles" charge because of Coulomb force. Therefore, the plastic mixtures can be separated as a result of the different positions to which they fall. Separation tests were performed on a sample containing 50% polystyrene and 50% AB$ plastics. Plastic particles obtained from crushed plastic plates were used. It was found that the separation efficiency depends on the electric potential difference between positive and negative electrodes, tribocharging time, the rotation speed of the tribocharger and the length of the electrodes. It was also found that it is possible to obtain a high purity and a high recovery rate for a binary plastic mixture.

Original languageEnglish
Pages (from-to)2953-2961
Number of pages9
JournalNihon Kikai Gakkai Ronbunshu, C Hen/Transactions of the Japan Society of Mechanical Engineers, Part C
Volume77
Issue number780
Publication statusPublished - 2011

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Electrostatic separators
Plastics
Electrodes
Electric potential
Charged particles
Separators
Recycling
Polystyrenes
Recovery

Keywords

  • Coulomb force
  • Cylindrical electrode
  • Electrostatic separation
  • Environmental engineering
  • Industrial machine
  • Kinematics
  • Recycling

ASJC Scopus subject areas

  • Mechanical Engineering
  • Mechanics of Materials
  • Industrial and Manufacturing Engineering

Cite this

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title = "Development of electrostatic separator using cylindrical electrodes",
abstract = "In this paper, the results of experimental and analytical studies of the performance of a new electrostatic separator for plastic mixtures for recycling are presented. The separator is of the free fall type and consists of four cylindrical electrodes. Prior to separation, plastic mixtures to be separated are tribocharged. When the charged particles are fed into the center of the space between the four electrodes, they are attracted to the space between the electrodes with voltages of polarity opposite to the particles{"} charge because of Coulomb force. Therefore, the plastic mixtures can be separated as a result of the different positions to which they fall. Separation tests were performed on a sample containing 50{\%} polystyrene and 50{\%} AB$ plastics. Plastic particles obtained from crushed plastic plates were used. It was found that the separation efficiency depends on the electric potential difference between positive and negative electrodes, tribocharging time, the rotation speed of the tribocharger and the length of the electrodes. It was also found that it is possible to obtain a high purity and a high recovery rate for a binary plastic mixture.",
keywords = "Coulomb force, Cylindrical electrode, Electrostatic separation, Environmental engineering, Industrial machine, Kinematics, Recycling",
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journal = "Nihon Kikai Gakkai Ronbunshu, C Hen/Transactions of the Japan Society of Mechanical Engineers, Part C",
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AU - Saeki, Masato

PY - 2011

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N2 - In this paper, the results of experimental and analytical studies of the performance of a new electrostatic separator for plastic mixtures for recycling are presented. The separator is of the free fall type and consists of four cylindrical electrodes. Prior to separation, plastic mixtures to be separated are tribocharged. When the charged particles are fed into the center of the space between the four electrodes, they are attracted to the space between the electrodes with voltages of polarity opposite to the particles" charge because of Coulomb force. Therefore, the plastic mixtures can be separated as a result of the different positions to which they fall. Separation tests were performed on a sample containing 50% polystyrene and 50% AB$ plastics. Plastic particles obtained from crushed plastic plates were used. It was found that the separation efficiency depends on the electric potential difference between positive and negative electrodes, tribocharging time, the rotation speed of the tribocharger and the length of the electrodes. It was also found that it is possible to obtain a high purity and a high recovery rate for a binary plastic mixture.

AB - In this paper, the results of experimental and analytical studies of the performance of a new electrostatic separator for plastic mixtures for recycling are presented. The separator is of the free fall type and consists of four cylindrical electrodes. Prior to separation, plastic mixtures to be separated are tribocharged. When the charged particles are fed into the center of the space between the four electrodes, they are attracted to the space between the electrodes with voltages of polarity opposite to the particles" charge because of Coulomb force. Therefore, the plastic mixtures can be separated as a result of the different positions to which they fall. Separation tests were performed on a sample containing 50% polystyrene and 50% AB$ plastics. Plastic particles obtained from crushed plastic plates were used. It was found that the separation efficiency depends on the electric potential difference between positive and negative electrodes, tribocharging time, the rotation speed of the tribocharger and the length of the electrodes. It was also found that it is possible to obtain a high purity and a high recovery rate for a binary plastic mixture.

KW - Coulomb force

KW - Cylindrical electrode

KW - Electrostatic separation

KW - Environmental engineering

KW - Industrial machine

KW - Kinematics

KW - Recycling

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