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  • How To Identify GOLD, Brass, Painted Gold, etc. In

    20/07/2012· MakingMoneyFromJUNK Identify gold at a glance know if it is brass, gold or just paint, instantly! This video shows several pieces of material an...

  • Metals Recovery from Artificial Ore in Case of Printed

    Processing of printed circuit boards with the presented plasma technology allows its effective neutralization and metals recovery. The composition of recovered metals and slag indicates that they are valuable raw resources. Overview of elemental analysis of recovered metals indicates that they can be used to recover copper, gold, silver, palladium, and others. Also, Sn recovery can be

  • Evaluation of gold and silver leaching from printed

    Printed circuit boards (PCB) of mobile phones have large amounts of metals with high economic value such as gold and silver. • Dissolution of gold was done with a cyanide-based reagent and silver with nitric acid. • Leaching of PCB with Na 2 S 2 O 3 and (NH 4) 2 S 2 O 3 to examine the feasibility of using these reagents was done.

  • Recovery of Valuable Metals from Waste Printed Circuit

    06/01/2018· This study presents a viable approach for recovery of precious metals such as gold (Au), silver (Ag), palladium (Pd), and base metals, including copper (Cu), nickel (Ni), cobalt (Co), lead (Pb) and zinc (Zn) from waste printed circuit boards (WPCBs) via iodine-iodide leaching and precipitation. The behaviours of dissolution and precipitation of precious and base metals during iodine-iodide

  • Bioleaching of gold from waste printed circuit boards by

    This stone evaluated the ability of Pseudomonas fluorescens to leach gold from waste printed circuit boards (WPCBs). Gold was recovered as gold-cyanide complex and cyanide was produced by Pseudomonas fluorescens.In this paper, the effect of pH on gold leaching efficiency was studied, the P.fluorescens was domesticated to grow at higher pH (pH 8 and 9), and the concentration of cyanide

  • Mechanism and Clean Procedure to Extract Gold from

    Gold is a typical precious metal, it is reported that the gold content in printed circuit board is twice more than that in the nature gold ore, thus recovery of gold from the printed circuit board has drew more and more attention all over the word. The conventional extracting of gold methods are subtotal toxic and are Easy to cause environmental pollution, such as cyanide process, aqua regia

  • 4-Recovery of Gold, Silver, Copper and Niobium from

    Recovery of Gold, Silver, Copper and Niobium from Printed Circuit Boards Using Leaching Column Technique 593 final concentration (leached PCBs core bead). The niobium concentration in the core bead from PCBs before cyanidation process is shown in the Fig. 3. The dore bead composition is: 77.5% Ag, 19.2% Au and 3.3% Nb. The fire assay is a

  • A better way to mine gold from old electronics

    Gold is often found on printed circuit boards, particularly under keyboards where its durability is an advantage. According to the UE researchers, about 300 tonnes of the metal are used in

  • Current Status on Leaching Precious Metals from Waste

    Current research on leaching precious metals from waste printed circuit boards (PCBs) in the world is introduced. In the paper, hydrometallurgical processing techniques including cyanide leaching, thiourea leaching, thiosulfate leaching, and halide leaching of precious metals are addressed in detail. In order to develop an environmentally friendly technique for recovery of precious metals from

  • Urban Mining for Gold. Processing Circuit boards with a

    21/04/2016· We are constantly improving our board grinder system for the recover of precious and base metals from old PCB's and electronics. We are getting very high rec...

  • Metals Recovery from Artificial Ore in Case of Printed

    Processing of printed circuit boards with the presented plasma technology allows its effective neutralization and metals recovery. The composition of recovered metals and slag indicates that they are valuable raw resources. Overview of elemental analysis of recovered metals indicates that they can be used to recover copper, gold, silver, palladium, and others. Also, Sn recovery can be

  • Recovery of Valuable Metals from Waste Printed Circuit

    This study presents a viable approach for recovery of precious metals such as gold (Au), silver (Ag), palladium (Pd), and base metals, including copper (Cu), nickel (Ni), cobalt (Co), lead (Pb) and zinc (Zn) from waste printed circuit boards (WPCBs) via iodine-iodide leaching and precipitation. The behaviours of dissolution and precipitation of precious and base metals during iodine-iodide

  • Sliding contacts on printed circuit boards and wear behavior

    A Printed Circuit Board sample exhibiting accelerated wear, on which hardness, thickness and roughness of gold were conform to specified values, was analyzed by generating a scratch with a nano indenter on the Nickel / Gold layer. The sanning electron microscope picture of the generated scratch (Fig. 3) shows: • Micro cracks. See arrow (a) on

  • Assessment of gold and silver in assorted mobile phone

    The Printed Circuit Board of a typical mobile phone weighs 15–43% by weight. It contains 28% metals and 70% non-metals (Sohaili et al., 2012). In one tons mobile phone waste, 340 g of gold, 3.5 kg silver, 140 g palladium, 130 kg copper exist as recoverable metals (United Nations University, 2009). Henceforth, mobile phone is a potent source

  • 4-Recovery of Gold, Silver, Copper and Niobium from

    Recovery of Gold, Silver, Copper and Niobium from Printed Circuit Boards Using Leaching Column Technique 593 final concentration (leached PCBs core bead). The niobium concentration in the core bead from PCBs before cyanidation process is shown in the Fig. 3. The dore bead composition is: 77.5% Ag, 19.2% Au and 3.3% Nb. The fire assay is a

  • How to Extract the Gold From Computer Circuit Boards

    Assemble the scrap circuit boards from computers or phones, memory chips from phones and cameras, and the small components behind LCD screens. Gold in these circuits occurs as a layer over a base metal substrate such as nickel or copper. Separate the gold-plated metal parts in the circuit boards using a magnet. Some gold-plated parts may be inside ceramic components.

  • PCB Manufacturing Use of Gold Advanced Circuits

    Gold is an important element in the design of printed circuit boards, and looking closely at most PCBs will reveal that the ‘fingers’ on the board include metal contacts fabricated from gold. These fingers are typically multi-layered metals that may include materials such as tin-lead, cobalt, or nickel, plated with a final layer of gold. These gold contacts are critical to the

  • A better way to mine gold from old electronics

    Gold is often found on printed circuit boards, particularly under keyboards where its durability is an advantage. According to the UE researchers, about 300 tonnes of the metal are used in

  • Printed circuit board Wikipedia

    A printed circuit board (PCB) mechanically supports and electrically connects electrical or electronic components using conductive tracks, pads and other features etched from one or more sheet layers of copper laminated onto and/or between sheet layers of a non-conductive substrate. Components are generally soldered onto the PCB to both electrically connect and mechanically fasten them to it.

  • Gold Recovery : 8 Steps (with Pictures) Instructables

    Next dump the remaining fingers and circuit boards into a deep stone tray and add water, sort out the cleaned of gold parts, put the cleaned parts in the waist and save the un-cleaned parts for re-dipping. After you have sorted the circuit board parts pour the water off through the coffee filter and flush with methyl hydrate to clean. Since