Mineral lab consumables fire clay crucible

Product Introduction

Fire Assay Crucible size: 5g/20g/30g/40g/45g/50g/55g/65g/75g and No.8/No.8.5/No.9/No.9G/No.9.5 crucibles are avaivalbe and also we make the customzied size. 

Free samples are avialable for test.

Assaying Fire Clay Crucible 

Type: Refractory Material

Working Temperature: ≥ 1350ºC(Fire assay working temperature less than 1150ºC)

Application: Nonferrous industry,Fire assay laboratory,smelting plant,metal sample analysis.

Feature: High fire resistance,high density,good corrosion resistance,good thermal shock resistance,Long service life,no hanging residue,no permeable,no cracking.

Remark:Quality and specification can customize as requirement .

Physical and chemical indicators :Fire resistance ≥ 1350ºC

Al2O3    45%-55%

SiO2:    38%-56%

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.

Chemical Composition

Applications

Precious Metal Analysis

Mining Laboratory

Laboratory Testing

Mineral Assaying

Fire Assaying

Gold Assaying

Product Information

   

Company Advantages

Certifications and Patents

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