What is the Silver

Silver is a chemical element with a symbol "Ag" and nuclear number 47. Soft, white, brilliant metal of transition, at it is the highest electric conductivity of any element and the highest heat conductivity of any metal. It occurs as pure free metal (native silver) and alloyed with gold (elektrum), just as in various minerals, such as vitreous silver and chlorargyrite. The majority of silver is made as a by-product of copper, gold.



Silver was known since ancient times and was long estimated as the precious metal used to make ornaments, jewelry, table layout of high value and ware and currency coins. Today, silver metal is used in electric contacts and conductors, in mirrors and in catalysis chemical reactions. Its structures are used in a photographic film and dissolve decisions of silver nitrate, and other silver structures are used as disinfectants. Though antibacterial use of silver has been substantially superseded by means of antibiotics.

Silver

Occurrence and extraction

Silver is found in the native form, has alloyed with gold or horn silver (AgCl), and pyrargyrite (Ag3SbS3) has united with sulphur, arsenic, antimony or chlorine in ores, such as vitreous silver (Ag2S). The basic sources of silver - ores of copper, copper nickel, leadership, and lead zinc Mexico, China, Australia, Chile and Poland is Peru. Peru and Mexico extracted silver with 1546 and are still main world manufacturers. The main silver mines of manufacture - Proano / Fresnillo, Cannington, Dukat, Uchucchacua.



Metal can be made also during time electrolytic clearings of copper and the statement of process Parkes on the lead metal received from lead ores which contain small quantity of silver. The commercial grade perfect silver - pure silver at least 99.9 %, and cleanliness, is more than 99.999 %, available. In 2007, Peru was the main manufacturer in the world of the silver close accompanied by Mexico, according to the British geological service.


спутниковое оборудование для НТВ Плюс в МО - Воздушное отопление домов недорогие кондиционеры. Биметаллические батареи.

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