Fire assay clay pots are randomly selected from crates package according to sampling rate.
Customization is also available for any requirement to shape, size and so on. We can even mold logo, model no. or other signs onto the bottom of crucible if it is required by customer.
Crucibles with fire assay flux and the sample is put into the fusion furnace. The lead captures the gold, silver and precious metals in the molten state to form a lead alloy (generally called a lead button). The lead alloy due to the high specificity sink to the bottom of the crucible. The base metal oxides and gangue react with fluxes (silica, borax, and sodium carbonate) to form slags (silicate or borate). Slags floats on the crucible due to its small specific gravity. So the gold and silver separate from the sample.
Our standard range of fire assay clay crucibles from 30g to 65g can usually be proceeded 5-times-firing and sometimes can be even repeatedly used in more than 9 times with some formula of flux. This feature provides our customers important benefits of reducing cost per firing and increasing profitability. And we can also design and supply to our customer's individual requirements and specifications in dimensions, shape and so on.
L.O.I(loss on ignition)
Precious Metal Analysis
Fire assay crucible
SiO2 + Al2O3
Automatic molding equipment
ISO 9001 SGS
Many stocks , delivery time around 5-10days . by sea or by air as customer request
Delivery & Service:
Timely delivery each time. Provide reliable service and responsible for each customer with each product. Our target is to satisfy every customer with the best service.
Wooden Case Dimension (mm)
7000 square meters work shop
Automatic production line
Longer working life
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