24 Hours Zinc
Atomic Number: 30
Atomic Weight: 65.409
Melting Point: 692.68 K (419.53°C or 787.15°F)
Boiling Point: 1180 K (907°C or 1665°F)
Density: 7.134 grams per cubic centimetre
Phase at Room Temperature: Solid
Element Classification: Metal
Period Number: 4
Group Number: 12
Group Name: none
30 Days LME Zinc Stock
Zinc compounds have been used for at least 2,500 years in the production of brass, however it wasn't recognized that zinc was the distinct element until much later. Metallic zinc was first produced in India sometime in the 1400s by heating the mineral calamine (ZnCO3) with wool. Zinc was rediscovered by Andreas Sigismund Marggraf in 1746 by heating calamine with charcoal. Today, most zinc is produced through the electrolysis of aqueous zinc sulfate (ZnSO4).
Zinc is the 23rd most abundant element in the earth's crust, and occurs as a zinc sulfide (ZnFe)S mineral, Sphalerite, which is the principal ore mined in the world.
Approximately one third of all metallic zinc produced today is used in a process known as galvanization. During galvanization, an object that is subject to corrosion, is given a protective coating of zinc. The zinc can be applied to an object by dipping it in a pool of molten zinc, but it is most often applied through an electroplating process. Sacrificial zinc anodes are used in cathodic protection systems to protect exposed iron from corrosion, particularly in marine vessels. Metallic zinc is also used to make dry cell batteries, roof cladding and die castings.
Zinc is used to make many useful alloys. Brass, an alloy of zinc that contains between 55% and 95% copper, is probably the best known zinc alloy. Brass was first used about 2,500 years ago and was widely used by the ancient Romans, who used it to make such things as coins, kettles and decorative items. Brass is still used today, particularly in musical instruments, screws and other hardware that must resist corrosion. Zinc is alloyed with lead and tin to make solder, a metal with a relatively low melting point used to join electrical components, pipes and other metallic items.
Zinc is also a necessary element for proper growth and development of humans, animals, and plants; it is the second most common trace metal, after iron, naturally found in the human body.