Separation of Covering Plastics from Particulate Copper in Cable Wastes by Induction Electrostatic Separation

Park, Chul-Hyun; Subasinghe, Nimal; Jeon, Ho-Seok

doi:10.2320/matertrans.m2015138

Cited by 19 publications

(4 citation statements)

References 13 publications

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“…The gravity separation (density-based separation) has large energy consumption and low efficiency, and therefore, over the last years, electrostatic separation technology has been researched and has compensated for the deficiency of gravity separation [11]. There are studies [43,44,45] that focus on estimating the optimal conditions of the process variables (e.g. electric field, splitter position, relative humidity) on the separation efficiency.…”

Section: Figure 3 the Process Flow Of Waste-cable Treatment Through Liquid Nitrogen Freezing Technologymentioning

confidence: 99%

Importance of Recycling the Waste-Cables Containing Copper and PVC

Blinová

Godovčin

2021

Research Papers Faculty of Materials Science and Technology Slovak University of Technology

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Urbanization, development of economy, increasing population and improved living standards and lifestyle have caused a sharp growth in waste. Inappropriate or inefficient waste disposal techniques can cause serious air, soil, and groundwater pollution, which subsequently can negatively affect the urban environment and threaten the health of residents. The goal of waste management is to move to a circular economy in which waste does not exist. If there is no possible way to reduce or reuse waste, the best solution is recycling it. Recycling brings abundant benefits on the economic and ecological levels levels, and helps reduce overall human health risk of adverse impacts. Recycling of the waste-cables which contain PVC and copper replaces the production of virgin PVC and mining of copper from copper ore, it reduces landfill solid waste pressures, saves energy and water sources, reduces emissions to environment, and also reduces negative impacts from improperly dispose of waste, etc. This paper presents an overview of recycling techniques for the waste-cables containing copper as a core and polyvinyl chloride as an insulating layer or sheath. It also lists advantages and disadvantages of these techniques and importance of recycling this type of waste.

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Section: Figure 3 the Process Flow Of Waste-cable Treatment Through Liquid Nitrogen Freezing Technologymentioning

confidence: 99%

Importance of Recycling the Waste-Cables Containing Copper and PVC

Blinová

Godovčin

2021

Research Papers Faculty of Materials Science and Technology Slovak University of Technology

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“…It is explained that even if the mixture is all conductive material, it can be electrostatically separated by the difference between conductivity and density under reasonable parameter conditions. Park et al [24] proposed an electrostatic separation process to separate coating material and granular copper from the crushing products of waste cables. They pointed out that the electric field strength and the relative position of the separator are the main factors affecting recovery efficiency.…”

Section: Introductionmentioning

confidence: 99%

Separation of Metal and Cathode Materials from Waste Lithium Iron Phosphate Battery by Electrostatic Process

Zhu

Bai

et al. 2023

Separations

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The improper disposal of retired lithium batteries will cause environmental pollution and a waste of resources. In this study, a waste lithium iron phosphate battery was used as a raw material, and cathode and metal materials in the battery were separated and recovered by mechanical crushing and electrostatic separation technology. The effects on material electrostatic separation of separation parameters such as the crushing particle size, the voltage of the static electrode, and the rotating speed of the grounding rotor were all studied combined with trajectory simulation and separation experiments. The results show that the crushing particle size of the material has the most significant impact on the separation effect, and the material separation effect primarily occurs in the range of 0.2–2.0 mm particle sizes. When the voltage of the static electrode is 30 kV, the rotating speed of the grounded rotor is 60 r/min, and the particle size is 0.4–0.8 mm, and the recovery rates for aluminum, copper, and lithium iron phosphate reach 93.2%, 91.1%, and 97.1%, respectively. In the recovery process for waste lithium batteries, using electrostatic separation technology instead of high-temperature roasting or chemical leaching can effectively improve the separation efficiency and reduce secondary pollution.

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“…Multi-step techniques are employed to recycle thin waste cables with diameters in the order of millimeters. These multistep techniques typically involve mechanical methods (such as the use of ultrasound [13] or hot-water processes [14] combined with a blender to disassemble the cables, followed by electrostatic separation [15,16], size classification [17], flotation [18][19][20], or dense medium separation [21] to separate the plastic and copper components), chemical methods (such as dissolution and cementation [22], chemical-or bio-leaching [23], and chloride volatilization [24]), and/or energy recovery processes (such as pyrolysis [25][26][27][28] and steam gasification [29]). Incineration and cement rotary kiln co-processing are alternative techniques for the treatment and disposal of PVC-containing Pyrolysis Behavior of Polyvinyl Chloride with Sodium Hydroxide and Application to Copper Recovery from Multiwire Tinned Copper Cables Takaaki WAJIMA* wastes that also afford energy recovery [30,31].…”

Section: Introductionmentioning

confidence: 99%

Pyrolysis Behavior of Polyvinyl Chloride with Sodium Hydroxide and Application to Copper Recovery from Multiwire Tinned Copper Cables

Wajima

2022

Int.J.Soc.Mater.Eng.Resour.

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In this study, polyvinyl chloride (PVC) was pyrolyzed with sodium hydroxide (NaOH) to capture the generated hydrogen chloride (HCl) gas as sodium chloride (NaCl) and carbonize the organic contents to generate fuel gases such as hydrogen (H 2 ) and methane (CH 4 ). In addition, the pyrolysis behavior of PVC with NaOH, and its application to copper recovery from thin PVC-coated tinned copper multiwire cables were examined. With an increase in temperature, the PVC released HCl gas at approximately 300°C and underwent carbonization to generate fuel gases at approximately 500°C. Upon immersing the PVC in a NaOH solution, it was converted into a powdered carbonaceous material; therefore, the amount of HCl gas decreased by being captured as NaCl, whereas the amount of fuel gases generated increased by pyrolysis. At a heating temperature of 500°C, the PVC coating of the tinned copper wire was removed via the formation of a carbonaceous material and sodium salts after the addition of distilled water. The results suggest that this environmentally friendly and eff ective process for capturing HCl gas as NaCl and converting the covered PVC into carbonaceous materials and fuel gases is suitable for PVC treatment, and the proposed approach can be applied to copper recovery from multiwire tinned copper cables through pyrolysis with NaOH.

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Separation of Covering Plastics from Particulate Copper in Cable Wastes by Induction Electrostatic Separation

Cited by 19 publications

References 13 publications

Importance of Recycling the Waste-Cables Containing Copper and PVC

Importance of Recycling the Waste-Cables Containing Copper and PVC

Separation of Metal and Cathode Materials from Waste Lithium Iron Phosphate Battery by Electrostatic Process

Pyrolysis Behavior of Polyvinyl Chloride with Sodium Hydroxide and Application to Copper Recovery from Multiwire Tinned Copper Cables

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