Fire Essay 2013

Fire Essay 2013-3
Most geologists, whether students, in academia or in industry have heard of, or have submitted samples to have precious metal content analysed by lead fire assay.The lead fire assay method is one of a host of metallurgical analysis methods and is also often referred to as the fusion and critical cupellation (high temperature oxidation) step.

Most geologists, whether students, in academia or in industry have heard of, or have submitted samples to have precious metal content analysed by lead fire assay.The lead fire assay method is one of a host of metallurgical analysis methods and is also often referred to as the fusion and critical cupellation (high temperature oxidation) step.

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 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).

Which is fine if you're a Libertarian, but I tend to take the stance that Libertarianism is like Leninism: a fascinating, internally consistent political theory with some good underlying points that, regrettably, makes prescriptions about how to run human society that can only work if we replace real messy human beings with frictionless spherical humanoids of uniform density (because it relies on simplifying assumptions about human behaviour which are unfortunately wrong).

TL: DR; the current banking industry and late-period capitalism may suck, but replacing it with Bitcoin would be like swapping out a hangnail for Fournier's gangrene.

The lessons learned by incorporating the contest into your curriculum may prevent an injury or even save a life.

Who's Eligible: Students throughout New York State in grades five through eight are eligible to participate.

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.

For a more comprehensive read-through with more details on the types of fluxes and the response of different elements, ALS Minerals provide quite an informative technical note here.

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