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Metallurgy/detect and separate iridium etc. from gold

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Question
i am in jewellery business.
now a days mixing of iridium etc in gold jewellery and other items has increased a lot.

such gold when refined does not refines properly.hand made jewellery cannot be made by it as it is generally heterogenous and breaks when wire is drawn out of it.

we need a method to detect the presence,calculate its percentage in gold and to remove it completely from it.

Answer
Metal detection is possible by Spark Alloy Elements Quantometer, also a simple method could be used: density measurement, As you know iridium is the second-densest element in the world (22.5 g/cm3), therefore by measuring the sample density and comparing with gold density (19.3 g/cm3) it could be find out that is there any iridium in sample or not. separation is possible by melting. The melting point of Gold is 1064 C, however iridium will melt at 2466 C.  

Metallurgy

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Bahaedin Nikrooz

Expertise

Metallurgy, corrosion, coating, Material, Metal, Welding, Paint, pipeline, test,

Experience

inspection, corrosion protection, destructive and non destructive test, welding inspection

Publications
Journal of Sol-Gel Science and Technology: Optimization of process variables and corrosion properties of a multi layer silica sol gel coating on AZ91D using the Box–Behnken design Journal of Sol-Gel Science and Technology:High temperature oxidation resistance and corrosion properties of dip coated silica coating by sol gel method on stainless steel

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masters of Material science

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