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The paper by Professor William Griffith on early attempts to melt platinum (1) was fascinating.In 1774, an attempt was made to melt platinum using a 1.2 m diameter burning glass filled with alcohol to focus the sun’s rays onto its surface, but the attempt proved unsuccessful. Platinum was finally melted in 1782 using an oxygen-hydrogen flame, and in 1856 a 600 g sample of platinum was melted using a coal gas-oxygen mixture (2). This remained the method for melting platinum until induction furnaces in the early twentieth century. By coincidence, 600 g is the maximum weight for most platinum jewellery casters today using induction coil heating around refractory crucibles followed by centrifugal or pressure differential casting of the melt up to about 2050oC. Platinum refiners and trade suppliers typically cast ingots of the order of 10–15 kg. Jewellery casters do not work at these levels for a mixture of interesting reasons.

FINAL ANALYSIS: Melting the PGMs: From Burning Glass to Laser Technology