Platinum is one of the rare metals. It is insoluble in acids and alkalis, except aqua regia. Platinum is also directly reacts with bromine and is dissolved in it. When it heated, platinum becomes more reactive. It reacts with peroxides, and in contact with oxygen in the air - with alkalis. A thin platinum wire burns in fluorine, emitting large amounts of heat. Reactions with other metals occur less readily. With a stronger heating platinum reacts with carbon and silicon, forming a solid solution, similar to the iron group metals. Platinum, especially in a finely divided state, is a very active catalyst for many chemical reactions, including those used on an industrial scale. The greater part of the platinum - about 62 percent - now consume Industry, Technology, Science, where you can compare the value of platinum, according to scientists, the role of salt in food: you need a little bit, but without it you will not manage. Platinum by the stability of the thermoelectric and mechanical properties, complemented by superior corrosion resistance and thermal stability is indispensable for modern electronics, radio engineering, precision instruments, aircraft, automation and remote control. Hundreds of technology cannot do without platinum. Platinum catalysts speed up different chemical reactions in millions of times. Each year the chemical industry consumes about 10 tons of platinum catalysts. Giant plants use made of platinum mesh, which helps to convert ammonia to nitric acid - a chemical product, which plays an important role in the economy. Petroleum industry uses platinum catalysts to produce high octane gasoline, aromatic hydrocarbons, and other valuable substances. Platinum was used for the production of coins for a few millennia later than gold and silver. The main supplier of platinum is South Africa. Platinum used in jewelry and dentistry, as well as in medicine. Special mirrors for laser applications are made of platinum. Coverings for components of the microwave technology are also made of platinum. Platinum and metals of the group are found in nature in a very dispersed. All these elements are geochemically associated with ultra-basic and basic rocks. There are about fifty of platinum-group minerals. Platinum, iridium, palladium in rocks and deposits are developed in native form, as well as solid solutions.
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