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6 results for “Wohlwill process” in Industry
Industry · 2 July 2026
Nine Nines: Inside a Modern Gold Refinery
…ive nines', for specialist electronics and scientific applications. · Why does the Miller process stop at about 99.5 per cent? Chlorination removes base metals and most silver efficiently, but the remaining platinum-group elements and residual silver will not separate as chloride…
Tomas Herrera · 12 min read
Industry · 6 August 2026
The Scrap Trade
…melted, sampled and assayed properly, then refined — typically by the Miller chlorination process to remove base metals, followed by Wohlwill electrolysis for high purity. The output is cast into bars or grain and re-enters the market indistinguishable from any other refined gold…
Ingrid Sørensen · 15 min read
Industry · 28 July 2026
Urban Mining: The Richest Gold Ore on Earth Is in Your Old Phone
…se strong acids, cyanide or high-temperature smelting, and the informal versions of these processes are responsible for severe heavy-metal and dioxin exposure in communities where they are practised. This article is reporting, not a procedure. · Does recycling reduce the need for…
Tomas Herrera · 13 min read
Industry · 7 August 2026
After the Cyanide
Every ounce of mined gold leaves behind roughly a tonne of processed rock and the water that carried it. What happens to that material after the last shift is the part of the industry with the longest timeline and the least coverage. · Cyanide is us…
Tomas Herrera · 17 min read
Industry · 4 August 2026
The Gold Inside Your Phone
…umber of very large facilities. Where that infrastructure is absent, the same material is processed with open acid baths and burning, which recovers a fraction of the metal and poisons the people doing it. · Industrial gold, then, is a small market that behaves nothing like the r…
Tomas Herrera · 15 min read
Industry · 7 August 2026
How Fake Gold Is Detected
Counterfeiting gold is not about making something that looks right. It is about defeating a specific test, and the industry's defences are an escalating conversation between forgers and instruments. ·…
Tomas Herrera · 15 min read
