The Clay Fusion Crucible we manufactured are made with a scientific mix of high-quality materials and are carefully crafted. The clay crucibles have high mechanical strength and thermal shock resistance. It can usually be reused up to five times.
Clay Fusion Crucible---Assay Crucible
It is mainly used in the analysis of metal samples and melting samples in laboratories, mineral laboratories and various industrial laboratories. The samples and ingredients are put into the crucible, and the melting experiment is carried out at high temperature. The lead button obtained by liquid precipitation is then subjected to the next experiment;
Using high-quality materials, high temperature resistance, good thermal conductivity, high melting purity, strong corrosion resistance and long service life.
Features: High refractoriness, no slag, no penetration, no cracking, it is the first-class auxiliary equipment for fire assay.
Not content with offering one shot disposable crucible, Yosion ﬁre assay crucibles have well deserved reputation for multiple ﬁrings. This feature provides our customers with important benefits of reducing cost per ﬁring and increasing profitablity.
Manufacturing with the latest automated technology offers guaranteed sizing consistency which is critical with multi-pour systems and automated lines. Meanwhile, carefully selected raw materials and more reasonable formulation with low caustic soda, low iron content and high silicon content enable Yosion crucibles to ensure high temperature resistance up to 1500°C.
Customized sizes and services are available.
Drill core samples (or others) are received at the laboratory, crushed, milled and dried in the oven. Samples are then separated into bags, tagged and weighed.
Next, the samples are prepared for the fusion process, which requires a reducing environment and so the samples are mixed with flux, a carbon source (coal dust) and litharge (PbO).
The samples are then placed into a fusion/ refractory crucible, ready to go into the furnace. The high tempareture (1000 – 1200°C) melts the sample while the flux fuses with the gangue (non-precious material) and the now liquid lead collects all the precious metals. The newly-formed Pb-Au-Ag-PGE concoction migrates to the bottom of the crucible due to its high density.
As cooled lead sample is then separated from the glass waste (slag) with a hammer, and placed in a porous bone ash (MgO) crucible, ready for the cupellation step.
The sample is then placed in a muffle furnace at around 1000°C. The lead oxidises with the aid of the inflowing air from the furnace muffle and then immediately melts and is absorbed into the crucible, leaving behind what is known as a precious metal prill.
The prill is then analysed for its precious metal content through dissolving it in aqua regia (a mixture of hydrochloric and nitric acid) and the concentrations determined by spectroscopic methods (AAS, ICPAES, ICPMS).
Eventual detection limits are in the region of parts per billion but accuracy is usually in the region of 3 -5% for this metallurgical analytical technique.
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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