How to Make Pure Gold
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How to Make Pure Gold

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Pure gold bars can be created using certain metal refining techniques. This presentation covers the Miller Process and the Wohlwill Process for making gold bars at 999 purity, or higher.

Pure gold bars can be created using certain metal refining techniques. This presentation covers the Miller Process and the Wohlwill Process for making gold bars at 999 purity, or higher.

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How to Make Pure Gold How to Make Pure Gold Presentation Transcript

  • How to Make Pure GoldHow to Make Pure Gold The Miller and Wohlwill ProcessesThe Miller and Wohlwill Processes Manhattan Gold & Silver | 45 W 47th Street | New York, NY 10036 | 212-398-1454
  • Refining Pure GoldRefining Pure Gold • Many industries require samples of pure gold. – However, pure gold is extremely rare in traditional mining. • Pure gold must be created by professional metal refinersprofessional metal refiners. • Two popular techniques for creating pure gold are the Miller Process and the Wohlwill Process. 2013 © Manhattan Gold & Silver2013 © Manhattan Gold & Silver www.mgsrefining.com | 212-398-1454www.mgsrefining.com | 212-398-1454
  • 2013 © Manhattan Gold & Silver2013 © Manhattan Gold & Silver www.mgsrefining.com | 212-398-1454www.mgsrefining.com | 212-398-1454 Miller Process MaterialsMiller Process Materials • Dr. Francis Bowyer Miller rocked the world of gold refininggold refining when he created a cheap and easy way to purify gold – the Miller Process. • The Miller Process requires these components: – Sample of impure gold – Induction furnace – Graphite crucible – Chlorine gas
  • 2013 © Manhattan Gold & Silver2013 © Manhattan Gold & Silver www.mgsrefining.com | 212-398-1454www.mgsrefining.com | 212-398-1454 How the Miller Process WorksHow the Miller Process Works • Gold is inert to a majority of chemicals. Its impurities (such as zinc, copper and iron) are not. • The first step in the Miller Process is to use an induction furnace to melt the gold sample in a crucible. • Once the sample is liquefied pure chlorine gas is blown across it. – This causes the impurities to form chlorides which rise to the top of the crucible.
  • 2013 © Manhattan Gold & Silver2013 © Manhattan Gold & Silver www.mgsrefining.com | 212-398-1454www.mgsrefining.com | 212-398-1454 How the Miller Process WorksHow the Miller Process Works • The final step is to skim the chlorides off the surface of the melted gold. • Once the chlorides have been removed the gold that remains is about 99.95% pure gold… • But for some applications that isn’t pure enough.
  • 2013 © Manhattan Gold & Silver2013 © Manhattan Gold & Silver www.mgsrefining.com | 212-398-1454www.mgsrefining.com | 212-398-1454 Wohlwill Process MaterialsWohlwill Process Materials • Hans Emil Wohlwill developed a method to create even purer samples of gold – the Wohlwill Process. – However, it’s much more expensive and complex than the Miller Process. • The Wohlwill Process requires: – An anode – an electrode through which electric current flows into a polarized electrical device. – An cathode – an electrode through which electric current flows out of a polarized electrical device. – An electrolyte – an electrically conductive substance.
  • 2013 © Manhattan Gold & Silver2013 © Manhattan Gold & Silver www.mgsrefining.com | 212-398-1454www.mgsrefining.com | 212-398-1454 The Anode, Cathode,The Anode, Cathode, and Electrolyteand Electrolyte • Each component is made of gold. – The anode is made of somewhat impure gold, about 95% purity or higher. (Lower purity will reduce the efficiency of the Wohlwill Process). – The cathode is made out of pure 24k gold sheets. – The electrolyte is pure chloroauric acid which is made by dissolving gold in aqua regia.
  • 2013 © Manhattan Gold & Silver2013 © Manhattan Gold & Silver www.mgsrefining.com | 212-398-1454www.mgsrefining.com | 212-398-1454 How the Wohlwill Process WorksHow the Wohlwill Process Works • With the components properly arranged an electric current is applied. • Electricity travels from the anode through the conductive electrolyte and into the cathode. – When this occurs the gold in the impure anode dissolves and its ions travel through the chloroauric acid then electroplate or “stick” to the 24k gold cathode. • This Wohlwill Process continues until the anode is completely dissolved. – The pure gold cathode is then melted down to be used.
  • 2013 © Manhattan Gold & Silver2013 © Manhattan Gold & Silver www.mgsrefining.com | 212-398-1454www.mgsrefining.com | 212-398-1454 Miller vs. WohlwillMiller vs. Wohlwill • To perform the Wohlwill Process a refiner must have enough gold for anodes, cathodes and chloroauric acid. – It takes gold to make gold. • Unless ultra-high purity gold is needed the Miller Process is the preferred way to purify gold.
  • About MGSAbout MGS Manhattan Gold & Silver | 45 W 47th Street | New York, NY 10036 | 212-398-1454 • Manhattan Gold & Silver (MGS) is a precious metals refiner that has been based in Manhattan’s historic Diamond District since 1985. We are a B2B company that buys and recycles precious metal scraps that accumulate in other businesses. • We serve: – Jewelers – Pawnbrokers – Dentists – The industrial sector – Antique dealers – Machinists – And more! • MGS also creates charts, calculators, and other online tools for our customers to use. – Try our Precious Metals Prices app, which lets you monitor the real-time precious metals market situation from anywhere, right from your iPhone, iPad, or Android device.
  • Recycle your PreciousRecycle your Precious Metals for ProfitMetals for Profit • MGS accepts gold, silver, platinum, and palladium. • Payouts are based on the London Fixing. • Up to 99% payout (among the highest in the US) – Up to 98.5% for gold brought in for hand testing. • Not in NYC? Ship us your precious metals using our Ship & Sell service which offers: – Same day wired payment (once lot is received) – Discounted, insured shipping – Payout calculator Manhattan Gold & Silver | 45 W 47th Street | New York, NY 10036 | 212-398-1454
  • Connect with MGSConnect with MGS • For amazing facts, history and news, read our gold and precious metals blog. • Join the conversation about precious metals on the MGS page on Facebook. • Follow gold, silver, and other precious metal trends at the MGS Twitter account. • Circle MGS on Google+ to hear our latest updates. • If you do business with us, connect with us on the MGS LinkedIn page. • To see precious metal melting and refinement in action, visit the MGS YouTube channel. Manhattan Gold & Silver | 45 W 47th Street | New York, NY 10036 | 212-398-1454