On analysis, the samples of platinum from the Ekaterinburg region were also found to contain iridium, osmium, iron, gold, sometimes osmiridium, and sometimes copper and rhodium. These samples were refined by Janety's process and by a process developed in by Peter G. Sobolevsky's process involved boiling the native metal with four times its weight of aqua regia.
Malleable platinum was produced from the calcined chloroplatinate. In the final stages, the platinum sponge was cold pressed, then heated to whiteness and further compressed. The granular structure became dense and malleable by this final compression 1.
The malleable metal was hammered for fabrications. Platinum was thus available in pieces of any required size. The platinum was made into medals, wires, dishes, crucibles, ingots and other artifacts 1. As there seemed to be plentiful amounts of platinum, Count Egor F.
Kankrin brushed aside words of caution from the German naturalist and traveller, Alexander von Humboldt, who had travelled in Colombia and was knowledgeable about Colombian platinum. He had advised that as Colombian platinum was available there would be difficulty in controlling the platinum price sufficiently to prevent depreciation and counterfeiting. In spite of this in Kankrin issued first 3 rouble platinum coins, and later 6 and 12 rouble platinum coins. In fact, the platinum price had fallen to a lower level than the exchange value of the Russian platinum coins 1.
All the coins that were minted bore, curiously, the same inscription on the reverse. In the centre of the face was the denomination, the date, and the mint mark: SPB for St. Around the edge was the mass of pure Urals platinum in zolotnik zol. The coins, minted for eighteen years, numbered in total: 1,, 3-rouble; 14, 6-rouble; and rouble.
The total weight of platinum used in their production was , troy ounces 1 , 2. Petersburg platinum refinery. Petersburg might advance faster. Petersburg and instead sent his son, Franz. On his way to St. Weiss worked on the platinum problem 1. In , F. He mentions that Alexander von Humboldt brought back from America a nugget of These platinum nuggets contained mostly platinum and iron, less copper, palladium, rhodium and nearly always some iridium.
Many of the smaller platinum grains are attracted by a magnet… The most iron-rich platinum occurs near Nischne-Tagilsk. Some grains are not attracted by a magnet. This is caused less by a lower iron content but more by a higher iridium concentration. The platinum in Goroblagodat in the Urals is, more than others, free of iridium in the state in which it is co-dissolved with platinum. Therefore this ore produces the purest platinum.
Basically it is the classical method used before the introduction of the liquid-liquid extraction processes. Later is mentioned:. It therefore contains iridium in all cases…. If it platinum is free of iridium it can be drawn into fine wire, like gold and silver. From the work of Berzelius we must conclude that the main impurities to look for in Russian platinum coins will be iridium and iron. However, it will be difficult to discern between the use of a natural high-grade alluvial platinum powder with low iridium and iron content and a well refined one, due to the large variations in the contents of their ore.
Russian platinum roubles are now collectors' items 5. This was refined to obtain a technically pure platinum powder for forging and minting. This powder also contained additional material, such as gold- and copper-rich inclusions. In a textbook on chemical technology published in 7 , the impurity concentration of platinum for crucibles was listed as Ir 2.
Genuine Russian roubles contain iron impurities up to 4 weight percent. In fact, a compilation of the composition of the platinum from Russian placer deposits shows that the iron content varies between 2. Coins analysed so far contain iron: 0. Banking regulations. Business debit order switching. Please take note You are about to leave the Absa website. Accept Cancel.
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