The Miller process is an industrial chemical procedure for refining gold to a purity of about 99.5 percent, patented by Francis Bowyer Miller in 1867. It works by passing chlorine gas through molten gold containing impurities; most contaminating metals form chlorides that volatilize or separate out as slag, while the gold itself remains unaffected at the high temperatures used.
Facts
SignificanceRefines gold to 99.5 percent purity, below the up to 99.999 percent of the Wohlwill process 1 Connections
In Field
Source Miller process, Wikipedia
Sources
1. Miller process, Wikipedia
Article body, patent statement
It was patented by Francis Bowyer Miller in 1867.
Article body, purity comparison
The resulting gold is 99.5% pure, but of lower purity than gold produced by the other common refining method, the Wohlwill process, which produces gold of up to 99.999% purity.
In Field: Metallurgical Engineering, Categories
Metallurgical processes
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