Fire Assay

What is Fire Assay ?

Fire assay is an analytical techmique usedin the determinaion of the qualty and purly of gold. This method dates back to ancient imes but has been refned and improved upon ove!the years.ire asay is an analyticaltechnique used inthe determinaion of the qualty and puityof gold. This method dates backto ancientimes buthas been refined and improvedupon over the years. Fire assay is an analyticaltechnique used inthe determination of the qualty and purity ofgold. This method dates back to ancient imes but has been refined and improved upon overthe years.

Fire Assay Process

Sample preparation

With Flux Dispensing and Mixing Devices, fire assay dosing and mixing can beachieved in a repeatable, traceable and operator-safe manner, while alsoincreasing laboratory productivity.

Fusion

The pulverized sample is weighed and mixed with a fluxing agent. Lead isadded as a collector. The sample is then heated in a fumace at about 1000degrees. During this process, the lead in the flux melts and collects the preciousmetals as it forms a low-melting-point alloy with them.

Cupellation

Following the fusion, the molten lead and the precious metals are placed in aporous cupel and reheated. The lead is absorbed by the cupel, leaving behinda bead composed of the precious metals. This is a critical step for purifying theprecious metals from the lead.

Weighing and Analysis

The resulting metal bead is weighed to determine the concentration of preciousmetals in the original sample. Further tests may be conducted to ascertain theexact content of gold and silver.

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Manual Crucible Loader

Manual Crucible Loader

Bullion Block

Bullion Block

Fire Assay Flux

Fire Assay Flux

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Clay Graphite Crucible

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Silicon Carbide Graphite Crucible

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Manual Crucible Loader
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Bullion Block
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Fire Assay Flux
Fluxes can convert infusible compounds at a certain temperature into other compounds that melt at that...
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Clay Graphite Crucible
Graphite clay crucibles, featuring high-temperature resistance, oxidation resistance, stable performance...
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Silicon Carbide Graphite Crucible
DECENT supplies silicon carbide graphite crucibles with high temperature resistance, acid and alkali...

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