Question

Name steps of Metallurgy used for extraction of Zinc from znic carbonate ore.

Answer 1

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Zinc (Zn) is a metallic element of hexagonal close-packed (hcp) crystal structure and a density of 7.13 grams per cubic centimetre. It has only moderate hardness and can be made ductile and easily worked at temperatures slightly above the ambient. In solid form it is grayish white, owing to the formation of an oxide film on its surface, but when freshly cast or cut it has a bright, silvery appearance. Its most important use, as a protective coating for iron known as galvanizing, derives from two of its outstanding characteristics: it is highly resistant to corrosion, and, in contact with iron, it provides sacrificial protection by corroding in place of the iron.

With its low melting point of 420 °C (788 °F), unalloyed zinc has poor engineering properties, but in alloyed form the metal is used extensively. The addition of up to 45 percent zinc to copper forms the series of brass alloys, while, with additions of aluminum, zinc forms commercially significant pressure die-casting and gravity-casting alloys. In sheet form, zinc is used to make the cans of dry-cell batteries, and, alloyed with small amounts of copper and titanium, an improved-strength sheet is formed that has applications in the roofing and cladding of many buildings.

The chemical compounds of zinc, particularly zinc oxide, have important industrial and pharmaceutical uses.


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Answer 2

steps involved in extraction of Zn from znco3 are .
znco3
|
calcination
|
zno
|
reduction to oxide
|
pure metal(Zn)