Use of metal detectors and metal separators

February 01, 2024

The metal detector is used to detect metal impurities mixed in the production process of plastics, chemicals, food, medicine, cosmetics, textiles, etc.

Metal detectors separate these metal impurities from raw materials or recycled materials. Used in plastic recycled materials. As the plastic nozzle material is processed by the pulverizer, some metal fragments or particles are mixed. Designed to prevent blockages in off-line production.

How is plastic and metal separated?

Metal trap

The pulverized waste is piped, and metal scraps having a diameter of 0.75 to 1.2 MM are separated using a metal trap during the transfer.

2. Electrostatic separator

The mixed material is pulverized and put into an electrostatic separator, and metal such as copper or aluminum can be separated by using different charging characteristics of metal and plastic. This method is applicable to the treatment of metal-filled composite materials, cable materials and metal-plated plastics.

3. Dissolution separation

The plastic coated metal part is immersed in a suspension containing methylene chloride, a nonionic surfactant, paraffin and water to dissolve and separate the plastic coating.

4. Brittle separation

The metal and plastic hybrid waste is cooled to the embrittlement temperature of the plastic, then pulverized, and the metal is separated from the plastic by a wind screen separation method.

5. Stripping of cable sheath

The outer skin materials of wires and cables are mainly polyvinyl chloride, polyethylene (including cross-linked polyethylene) and synthetic rubber and natural rubber. In addition to the above electrostatic separation method, there are two methods of dry and warm methods to make plastic and rubber. Effectively separated from copper and aluminum core wires.

(1) Dry separation: The inside of the cable is uniformly heated by a far-infrared device, and the outer skin is manually peeled off.

(2) Wet separation: The aluminum wire is immersed in a solution of a penetrating agent (surfactant), heated to 70-90 degrees, and then peeled off the skin, and then continuously washed with an organic solvent several times to completely remove the tar.

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