fire-assay

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fire-assay

chemical process

Learn about this topic in these articles:

description

In assaying
…most economically assayed by the fire method, which usually consists of six steps:
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gold production

In gold processing: Assaying
Fire assay is considered the most reliable method for accurately determining the content of gold, silver, and platinum-group metals (except osmium and ruthenium) in ores or concentrates. This process involves melting a gold-bearing sample in a clay crucible with a mixture of fluxes (such as…
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silver production

In silver processing: Assaying
The fire assaying techniques described above for gold are equally applicable to silver. In order to determine the silver content of a fire assay bead, the bead is first weighed, then boiled with 35-percent-strength nitric acid to dissolve its silver content, and then weighed again. The…
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