Metal of platinum a group of things with common features has similar physico-chemical quality already, have respective character again. Their collective character is: Besides osmic outside be steel gray with ruthenium, the others all is silvery white; Melting point sex of big, electric heat stabilizes tall, intensity, fight sex of bad news of electric spark corrode admirable, high temperature fights tall, corrosion resistance oxidation function active of strong, catalysis is good. Respective character decided different use again. For example the resistance that platinum still has good plasticity and stability and resistor temperature coefficient, can forging to wait into platinic silk, platinic foil; It is as not direct as oxygen chemical combination, not by acerbity, alkaline erode, dissolve in the aqua fortis at heat; Palladium but nitric acid of dissolve Yu Nong, its bulk can be absorbed below room temperature 350 ～ of 850 times hydric. Rhodium and iridium not dissolve at aqua regia, can have mixed with natrium of melt hydrogen oxidation oxidation natrium reaction, generate deliquescent the compound at acid; Osmic with ruthenium not dissolve at aqua regia, easy however oxidation becomes tetroxide.

Already discovered element of more than kinds of 200 platinum a group of things with common features is mineral at present. Can divide it is 4 kinds big:

① natural metal: Natural platinum, natural palladium, natural rhodium, nature is osmic wait;

② metal each other changes thing: Mine of palladium platinic mine, osmic iridium mine, ruthenium osmic iridium, and the metal of platinum a group of things with common features and iron, nickel, copper, gold, silver-colored, lead, stannum metal each other that joins with metallic key changes thing;

Half metal each other changes ③ content: Platinic, palladium, iridium, osmic wait to wait to comparative with the metal bolts or be being had with bismuth, tellurium, Selenium, antimony the covalent bond of metallic key composition compound;

④ sulfide and arsenic change thing: Industrial mine owner should have arsenic platinum mine of iridium of palladium of osmic mine of platinum of mine of palladium of mine of palladium of tellurium of mine, natural platinum, bismuth waiting for an axis, tellurium, arsenic, tellurium and mine of nickel of bismuth tellurium palladium. Arsenic platinic mine and mine of palladium of tellurium of bismuth waiting for an axis see Yuyuan lays platinic field more,

Metal of platinum a group of things with common features is mineral the content in ore is common very small, with every tons of a few grams (G/t) plan, mineral grain is little, 6 elements are in different bed content each different. If the Bushenweierde of south Africa is miscellaneous,the platinum in cliff is main element, it is the word of 100 with platinum, palladium is 40, ruthenium is 10, rhodium is 6, iridium is 1, osmic not as good as 1. The Nuoliersike of Russia is given priority to with palladium (be platinum 3 times) . Rate of the platinum in the ore in Canadian Sa Debai, palladium is adjacent.
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