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     · Circuit boards found in most of the electronic devices may contain arsenic (As) cadmium (Cd) chromium (Cr) lead (Pb) mercury (Hg) and other toxic chemicals. Typical printed circuit boards treated with lead solder in electronic devices contain approximately 50 g of tin-lead solder per square meter of circuit board . Obsolete refrigerators

  • What Can We Do About the Growing E-waste Problem

     · Electronic devices are made of a complex mix of materials that include gold silver copper platinum palladium lithium cobalt and other valuable elements. The U.S. Environmental Protection Agency (EPA) says "One metric ton of circuit boards can contain 40 to 800 times the amount of gold and 30 to 40 times the amount of copper mined from

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  • What Can We Do About the Growing E-waste Problem

     · Electronic devices are made of a complex mix of materials that include gold silver copper platinum palladium lithium cobalt and other valuable elements. The U.S. Environmental Protection Agency (EPA) says "One metric ton of circuit boards can contain 40 to 800 times the amount of gold and 30 to 40 times the amount of copper mined from

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     · Circuit boards found in most of the electronic devices may contain arsenic (As) cadmium (Cd) chromium (Cr) lead (Pb) mercury (Hg) and other toxic chemicals. Typical printed circuit boards treated with lead solder in electronic devices contain approximately 50 g of tin-lead solder per square meter of circuit board . Obsolete refrigerators

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  • Electronic Waste Recycling and Disposal An Overview

     · Electronic waste or e-waste is said to be the fastest growing stream of hazardous waste in the world. E-waste is comprised of a variety of inputs including hazardous materials potentially valuable and recyclable materials and other inputs. E-waste follows a range of pathways after disposal including formal and informal recycling storage and dumping in both developed and less-developed

  • Electronic Waste Recycling and Disposal An Overview

     · Electronic waste or e-waste is said to be the fastest growing stream of hazardous waste in the world. E-waste is comprised of a variety of inputs including hazardous materials potentially valuable and recyclable materials and other inputs. E-waste follows a range of pathways after disposal including formal and informal recycling storage and dumping in both developed and less-developed

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    The overall recycling efficiency for Europe for copper in all types of waste excluding prompt scrap and scrap imports is 48 with a range of 5–58 depending on the country.

  • Recovering gold from scrap electronics page 1

    2003. a. you can strip the gold by reverse plating i.e. making the job as anode in an electrolytic solution of 90 nacn 15 naoh and 15 sodium meta nitro benzene sulphonate and stainless steel as cathode. gold will deposit on cathode. just peel off the gold and refine in acid mixture of nitric or sulphuric acids or dissolve it aqua regia dilute then add sodium meta bisulphite pure gold

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     · By recycling 70 of e-waste generated globally (28 million tons) China would potentially recover 5.6 million tons of copper each year which is ∼19 of its known copper reserve and more than 10 times the volume of imported copper in 2009 (0.53 million tons).

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    The circuit board is a case in point Once separated from the other functional units this may be submitted to current recycling processes that entail pyrolysis and production of metal slags followed by refining and electro‐winning processes to recover the more valuable metals with a particular focus on gold (Hagelüken and Corti 2010

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     · and copper encourages recycling studies from an economic point of view. However the presence of heavy metals turns this scrap into dangerous residues. This in turn demonstrates the need for solutions to this type of residue so as to dispose of it in a proper manner without harming the environment. The recycling of printed circuit boards from

  • E-Waste Recycling Where Does It Go from Here

     · By recycling 70 of e-waste generated globally (28 million tons) China would potentially recover 5.6 million tons of copper each year which is ∼19 of its known copper reserve and more than 10 times the volume of imported copper in 2009 (0.53 million tons).

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  • Recovering gold from scrap electronics page 1

    2003. a. you can strip the gold by reverse plating i.e. making the job as anode in an electrolytic solution of 90 nacn 15 naoh and 15 sodium meta nitro benzene sulphonate and stainless steel as cathode. gold will deposit on cathode. just peel off the gold and refine in acid mixture of nitric or sulphuric acids or dissolve it aqua regia dilute then add sodium meta bisulphite pure gold

  • Metal Recycling Machine Manufacturer Expert in Metal

    We manufacture copper cable granulator wire stripping machine radiator recycling machine and other metal recycling machines. Top manufacturer technology leader dedicated to promote fast recycling.

  • E-waste Environmental Problems and Current Management

    The overall recycling efficiency for Europe for copper in all types of waste excluding prompt scrap and scrap imports is 48 with a range of 5–58 depending on the country.

  • SMT Surface Mount Technology Electronics Manufacturing

    JMW Enterprises Inc.Buyer Seller Broker of Electronic Assembly Equipment Shenzhen ETA Technology Co. LtdETA is the world s leading provider of SMT factory planning solutions providing SMT Machine More than 25 years of experience. KingFei SMT TechMain Products 1 Original new and Original Used SMT/AI Spare Parts. 2 SMT Equipments And Related Machine( SMT Calibration