Patent ID: 6774332
Filing Date: 2004-08-10
Classification: B03C

Abstract:
A composite sorting apparatus comprising:a rotationally moving electrode disposed so as to rotationally move in a predetermined direction; a discharge electrode for corona discharge which is provided opposite the rotationally moving electrode at a predetermined distance therefrom; and a plate-shaped electrostatic electrode provided downstream of the discharge electrode and located opposite said rotationally moving electrode at a predetermined distance therefrom to form an electrostatic field between the electrostatic electrode and said rotationally moving electrode; wherein high voltage of a polarity opposite to that of said rotationally moving electrode is applied between said rotationally moving electrode and both said discharge electrode and electrostatic electrode, a mixture of metal pieces and plastic pieces is loaded onto said rotationally moving electrode, corona ions are applied to the mixture from said discharge electrode, and the mixture is introduced into said electrostatic field so as to be separated into the metal pieces and the plastic pieces, the apparatus being characterized in that: the discharge electrode has a plurality of discharge sections each having a sharp tip, the discharge sections are provided in a cross direction of the rotationally moving electrode at predetermined intervals, and arranged so that an interval X in cm (in) between adjacent discharge sections with respect to a distance L1 in cm (in) from tips of the discharge sections to the rotationally moving electrode meets the following expression (1): 0<X/L1&lE;3â€ƒâ€ƒ(1) the discharge sections are each formed so that an area formed on the rotationally moving electrode and to which corona ions are applied has a diameter three times as large as the distance L1 in cm (in), and a voltage V1(kV) applied between said discharge electrode and said rotationally moving electrode meets the following expression (2): 0.5 kV/cm 0.5 kV/in&lE;V1/L1&lE;10 kV/cm(25.4 kV/in)â€ƒâ€ƒ(2).