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"""Zinc or zinc (Zn) is a chemical element with atomic number 30 and located in group 12 of the periodic table of elements. It is one of the least common metals and represents around 0.0075% of the earth's crust. It is found in the form of minerals, for example, blende (zinc sulphides), calamine (silicates) and smithsonite (carbonate). It is sometimes classified as a transition metal, although it really is not. It is bluish-white in color. When there is moisture, a superficial layer of oxide or basic carbonate forms that insulates the metal, protecting it from corrosion. Its fusion is at 420ºC and it has a density of 7140 kg / m3. It has a great resistance to cold plastic deformation, in fact, the lamination must be done above 100 ° C. Pure zinc is malleable and ductile, thus being able to roll and tighten it. However, it can break if small amounts of other contaminating metals are found. It is a good conductor of electricity and heat, although the cigar is not ferromagnetic.
The most common alloys are the following:
Brass: it is the best known zinc alloy (copper + zinc)
Maillechort: it is also known as argentán is an unalterable alloy (copper + zinc + nickel)
English metal: zinc + antimony base, it is a mixture that also contains tin, antimony, copper and sometimes lead.
Tombac: copper and zinc base, i.e. brass + tin
Zamak: it is the commercial name of the alloy based on zinc, aluminum, magnesium and occasionally copper.
Zinc is obtained from mining activities in underground deposits or open fields. Once the rock is obtained, it is crushed. Then, the flotation process begins to get the zinc concentrate. Iron-rich minerals are treated dry. First they are roasted to transform them into oxide sulfide and then the content is reduced to carbon like coal, obtaining the metal. Another way to do it, which would be cheaper and easier, would be to reduce the zinc oxide with carbon. Doing it wet, the oxide is roasted, which is leached with dilute sulfuric acid. The lyes obtained have to be purified by separating the different phases present. Then it is subjected to electrolysis creating plates a few millimeters thick that are removed from time to time. The cathodes obtained are melted and the metal is cast in order to market it. Zinc can be recycled without losing its physical and chemical properties. Zinc can be recycled from scrap brass products, scrap from galvanizing, and scrap zinc parts. Zinc-coated steel scrap is generally produced from manufacturing process scrap and obsolete products. Almost 30% of the zinc consumed is obtained from recycling and currently 90% of the metal that can be recycled is recycled. """