When processing pins you should use just HCl alone for the first step as it dissolves all the base metals while leaving the gold intact.never use the HCl H2O2 method to do the primary stripping of any gold plated item as you may put the gold into solution with the other metals.I always do the prelininary stripping with HOT HCl in a crockpot setup as shown in my …
In this research simultaneous gold and copper recovery from computer printed circuit boards (CPCBs) was evaluated using central composite design of response surface methodology (CCD-RSM). ... Simultaneous recovery of Ni and Cu from computer printed circuit boards using bioleaching: Statistical evaluation and optimization. Bioresour. Technol ...
A. Yes, there is gold in computers. Maybe $0.20 worth in modern PCs. Using dangerous chemicals will create lots of hazardous waste from which can be extracted a tiny bit of gold which can't be sold without an assay fee.
Goldsilverpro, There have not been many metals involved (sometimes iron) but the main problem we are having is that there are organics dropping with the gold. The gold np waste has Pc-4 and polyethylene glycol as part of the complex as well. We have been heating the reduced waste to remove the organics and it has worked, but for waste that contains larger …
Are you looking to mine your old computer for gold? This project will not make you rich, but it is a fun and great way to put your e-waste to use. Gold is used in ... The best parts to use in this experiment are printed circuit boards, motherboards, central processing units, random access memory chips, drives, and other internal modems. ...
My 1st attempt at gold recovery stopped in its tracks. I took a friends advice and tried 2 parts Muratic acid and 1 part Hydrogen Peroxide to extract gold from pc boards and cell phones. He has since went missing and I dont know what the remainder of this process is. I'm a single father so a cheap process is what I need.
DOI: 10.1252/JCEJ.16WE087 Corpus ID: 99150678; Adsorptive Recovery of Gold(I) from Sodium Hypochlorite Media @article{Inoue2017AdsorptiveRO, title={Adsorptive Recovery of Gold(I) from Sodium Hypochlorite Media}, author={Katsutoshi Inoue and Hidetaka Kawakita and Keisuke Ohto and Shafiq Alam}, journal={Journal of Chemical Engineering of …
There's no visible gold on the test strips but the units each contain 4 circuit boards and the connectors are fully plated. ... Right, from what I gather, not all of them use Gold.My dad was using OneTouch Ultra which doesn't "appear" to have any sort of Gold plating on the strips (but may have some other sort of metal worth saving, I don't ...
Gold fingers are typically found on PCI cards, ISA cards, or on Memory sims/dimms/etc. They create the corrosion free connection between the computer and the expansion card. This process can also be used to recover gold from CPU such as Pentium Pro, or Cyrix or older 486 and lower generation chips.
I have successfully recovered gold from computer bits and pieces. My problem is that I dissolved gold from plates and cups in HCL and bleach but cannot precipitate it with sodium metabisulfite. Yes, there is gold in my solution.
A new method for recovering high-purity gold from discarded electronics is paying back US$50 for every dollar spent, according to researchers – who found the key gold-filtering...
Steve, As most of us know pins are a very unique case as the variety of pins, base metal composition, and plating characteristics all affect the recovery approach. Here's my take on the pins: 1) Plastic headers containing partially plated pins: AP. The AP strips the foils relatively quickly due to the spacing between the individual pins in the header. The partial plating allows …
Gold fingers are typically found on PCI cards, ISA cards, or on Memory sims/dimms/etc. They create the corrosion free connection between the computer and the expansion card. This …
In Liddell's Handbook of Nonferrous Metallurgy, Vol. 2, 1945, there is to be found a very complete account of the uses of chlorine as applied to the recovery of gold and silver, in Chlorination Processes & Methods.Introducing the chapter entitled "Chlorine Metallurgical Processes" Liddell says:
The ICs and CPUs were manually removed from computer printed circuit boards were and shredded into pieces of approximately 1 × 1 cm 2 using pliers, scissors and a Dremel (Dremel 8220-2/45, USA). The cut pieces were subjected to cryomilling (Retsch CryoMill, Germany) in liquid nitrogen, freezing the samples at −196 °C for 15 min at 150 rpm ...
Unlock the secrets of gold recovery from scrap hard drives! Discover tips on extracting precious metals from circuit boards and share your journey. ... Hard drives contain several valuable components for gold recovery, primarily gold-plated connectors and circuit boards. These components often contain small amounts of gold, which can accumulate ...
The removal of the cyanide and copper (Cu) from the waste printed circuit boards (WPCBs) cyanide leach solution through the alkaline chlorination using electro-generated hypochlorite (NaOCl ...
I figured if the first step was leaching copper then I could use some thin pcb board with a thing copper coating (the board is new and unused). ... Then 17ml of some bleach claiming 36g/100ml hypochlorite was added. The liquid measured pH 4.1 on a digital meter at this point. ... Sciencemadness Discussion Board » Fundamentals » Chemistry in ...
This study reveals the reclamation process of gold from a brine-leached solution of waste printed circuit boards (WPCBs) after the maximum leaching of base metals in a nitric acid medium.
In this study, we propose an efficient hydrometallurgical process using large pieces of PCBs rather than pulverized PCBs to simplify the overall recycling (metallic as well …
When using nitric acid to remove base metals in gold recovery it is very easy to misplace your gold. On electronics that use gold for shielding (such as RF shielding) the gold can be very thin and instead of coming off in foils will …
The Canadian researchers' alternative is a solution of acetic acid and an oxidant — a nontoxic technique to dissolve gold, which is stripped from circuits in about 10 seconds, leaving intact copper, nickel, iron, and other …
The removal of the cyanide and copper (Cu) from the waste printed circuit boards (WPCBs) cyanide leach solution through the alkaline chlorination using electro-generated hypochlorite (NaOCl) followed by magnetite (Fe3O4) adsorption is …
Gold recovery is interesting due to its vast industrial applications, high market prices and extensively used precious metal, the sanctuary value attributed to gold during international political ...
Hello members, I saw a YouTube video from forum member kadriver using vinegar, sea salt and peroxide to remove gold from finger boards. The video was so promising, I decided to give it a try. I did, and it works well without the need to use any dangerous acids. I have used this process and I have stripped gold from pinless/padded fiber cpu's and …
The recovery of gold from electronic waste (e-waste) involves several innovative processes aimed at maximizing yield and minimizing environmental impact. Key methods include hydrometallurgical techniques, leaching processes, and the use of advanced materials for adsorption. ## Hydrometallurgical Techniques - The hydrometallurgical recovery of gold from …
2Au + 6HCl + 3NaClO --> 2AuCl3 + 3NaCl + 3H2O From the equation theoretically, two moles of gold (2 x 196.97 grams) or 393.94 grams of gold will react with six moles of HCl acid (6 x 36.46g) or 218.77 grams of HCl and three moles of sodium hypochlorite (3 x 0.0134g) or 0.0402 grams of NaClO -----> to yield two moles of gold chloride (2 x 303.325g ) or 606.65 …
Gold recovery from Printed circuit boards – PCB recycling. Gold recovery from Printed circuit boards Most printed circuit boards will contain gold, silver and palladium, we at B.W. Recycling, recover these precious metals out of the printed circuit boards, there are few types of printed circuit boards that we recycle, printed circuit boards also contain copper that has to be …
Nowadays, over 300 tons of Au are used in electronic equipment each year with other precious and strategic metals such as Ag, Pt, Pd, Cu, Nb, Ta, etc.. After the use-phase, the electronic devices become electronic waste (e-waste); consequently it is important to consider e-waste as a secondary supply for the recovery of these metals. This paper presents the recovery of Au, …
There are basically two methods of melting gold flakes and dust to recover gold available to the average person, the mercury method called Gold-Mercury Amalgam with its obviously toxic by-products and the Borax Method.
Copper and gold recovery from CPU sockets by one-step slurry electrolysis. J. Cleaner Prod. ... Role of hypochlorite in the harmless treatment of cyanide tailings through slurry electrolysis ... Electrochemical extraction of tin and copper from acid leachate of printed circuit boards using copper electrodes. Journal of Environmental Management ...