Tel. +39 080 4674390 info@metalrecuperi.it Toggle Menu THE ZINC ZINC The zinc is a chemical element with atomic number 30. Its symbol is Zn . Zinc is solid at room temperature. It is a moderately reactive metal, which combines with oxygen and other non-metals; reacts with diluted acids to generate hydrogen. The only oxidation state of zinc is +2. It has similar characteristics to calcium, but less reactivity. In the presence of dithizone it assumes an intense red color. Zinc is an essential trace element, present in the body in greater quantities than any other trace element other than iron. Zinc alloys have been used for centuries: brass is arguably the oldest. Objects of 87% pure zinc have been found in prehistoric Transylvania. Due to the low boiling point and chemical reactivity of this metal (pure zinc tends to evaporate rather than collect in liquid form) the true metallic nature of this element was not recognized by the ancients. The manufacture of brass was known to the Romans as early as 30 AD, with a technique that involved heating copper and calamine in a crucible. The heat reduced the zinc oxides of the calamine, and the free zinc was captured by the copper, forming brass, which was then cast into molds or forged. L’estrazione e l’uso di forme impure di zinco era praticato già nel 1000 a.C. in Cina e in India; per la fine del XIV secolo gli indù erano a conoscenza dell’esistenza dello zinco come metallo a sé stante, diverso dai sette metalli noti agli antichi. In Occidente la scoperta dello zinco puro metallico pare sia dovuta al tedesco Andreas Marggraf, nel 1746, sebbene l’intera storia presenti dei lati romanzati. Descrizioni di come ottenere ottone sono trovate in Europa occidentale negli scritti di Alberto Magno (1248 circa), ed entro il XVI secolo, la conoscenza e l’uso del nuovo metallo si diffuse ampiamente Zinc is the twenty-third most abundant element in the earth's crust; the most exploited zinc deposits usually contain 10% iron and 40% -50% zinc. The minerals from which zinc is extracted are sphalerite (or blende), smithsonite, calamine and franklinite. There are zinc mines all over the world, but the largest producers are Australia, Canada, China, Peru and the United States. In Europe the two most important mines are the Vieille Montagne in Belgium and the Zinkgruvan in Sweden. Metalrecuperi Srl Imp. And headquarters: 70129 Bari - Ceglie del Campo SP70 Ceglie-Adelfia, 137 Imp. 70010 Valenzano (BA) SP70 Ceglie-Adelfia km 2 + 320 Search for: © 2021 Catalog Me! by impleCode By using the site, you accept our use of cookies. more information I accept