Fire assay is the industry-standard method for obtaining analytical data from ores or alloys. During this process, a sample containing gold is melted in a clay crucible with a flux mixture, including lead flux, in a fusion furnace. Through a melting process at temperatures exceeding 1000°C, precious metals are separated and collected in lead buttons. Subsequently, the lead is oxidized using a cupellation furnace, resulting in the extraction of pure precious metals.

Explore the essential steps and equipment in sample preparation and fire assay for precise analysis of precious metals in mineral laboratories.

This article provides a comprehensive reference for fire assay clay crucibles, detailing their definition, specialized material formula, advanced production processes, key characteristics, rigorous testing methods, and careful packaging for various precious metal assay applications.

This article provides a comprehensive guide to different types of clay crucibles—fireclay, high-temperature ceramic, and clay graphite—detailing their material composition, thermal and chemical performance, and specific applications, particularly within the context of fire assay.

Solutions for fire assay methods, fire assay equipment, fire assay clay crucibles, fire assay flux formulations, etc.