how to make pure gold

How to Make Pure GoldHow to Make Pure Gold

The Miller and Wohlwill The Miller and Wohlwill ProcessesProcesses

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 refiners.

• Two popular techniques for creating pure gold are the Miller Process and the Wohlwill Process.

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Miller Process MaterialsMiller Process Materials

• Dr. Francis Bowyer Miller rocked the world of gold 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

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How the Miller Process How the Miller Process WorksWorks

• 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.


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How the Miller Process How the Miller Process WorksWorks

• 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.


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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.


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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.


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How the Wohlwill Process How the Wohlwill Process WorksWorks

• 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.


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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 (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.

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Recycle your Precious Recycle 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


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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.


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