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Thanks to Zinc We Have Printing Ink!
|
| Industrial/world
Importance |
 |
Zinc has many uses. The most important of its
uses is galvanizing. Galvanizing is when you pour a thin layer
of Zinc over another metals entire surface. For example if you
galvanize steel it will stop the steel from corroding. So the
point of Galvanizing is to stop other metals from corroding.
Some things are too big too be galvanized, such as big pipes
run underground. Those pipes that run underground aren't galvanized,
but big blocks of Zinc are put around them to stop them from
corroding. Zinc plates are also used in photocopiers. The first
thing that happens is that the zinc oxide plate inside the photocopier
is electrically charged. After it is exposed to the document.
Then light passes through the document onto the plate. Parts
of the plate that are lighted carry away electric charge.The
dark parts on the plate that corresponds to the ink remained
charged. After that a black powder, called Toner is distributed
over the plate. The powder sticks to the electrically charged
part. last the image is transfered to a piece of paper by heating.
Also used to coat inner surfaces of cathode-ray-tubes,
which are used in TVs and computor monitors. Another major use
of zinc is in pennies. The penny was made of Zinc since 1981.
The penny is made of Zinc and coated with copper to keep its
original color |
| Discovery |
 |
Zinc was first discovered in India in the 13th century. It
was rediscovered by Andreas Marggraf in 1746. The word zinc
comes from the German word zin , meaning tin. It is
.007% of the earth's crust.Separated from zinc blende and calamine
by Froth Flotation.Combined with other
substances to make Brass, nickel silver, soft solder, aluminum
solder,and prestal |
| Genaral Information |
| |
Zinc is a bluish white metal that has atomic number of 30
and an atomic symbol of Zn.The density of Zinc is 7.14 g/cm3.
The atomic wieght of Zinc is 65.38 cm/mol. It's boiling point
is 1180 K. And it is a conductor of thermal and electrical.
It is usually not malleable except at 100-150 C. It is in the
family of transition metals.Zinc's freezing point is 629.78
K. It is used in batteries and it combines with copper to form
brass. |
| Froth Flotation |
| |
The first thing that happens is the zinc sulfide
is extracted from the Earth's crust. After that it goes through
Froth Flotation, where it is crushed into powder. The powder
is placed in a vat with water and froth chemicals. Jets of air
go into the vat causing the froth chemicals to make bubbles.The
chemicals in the vat prevent the metals from getting wet by
the water.The dry metals float to the top while wet stuff sinks
to the bottom. The metal that floats to the top is Zinc. |
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| Isotopes |
Half Life of |
| Zn-62 |
9.26 hours |
| Zn-63 |
38.5 minutes |
| Zn-64 |
stable |
| Zn-65 |
243.8 days |
| Zn-66 |
stable |
| Zn-67 |
stable |
| Zn-68 |
stable |
| Zn-69m |
13.76 hours |
| Zn-70 |
stable |
| Zn-72 |
46.5 hours |
. |
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Want to know more about another element? Check out Hafnium!
|
| Glossary |
- sulfide-a compound of sulphur and some other element that is
more electropositive
- electropositive- having a positive electric charge
- froth-a mass of bubbles in or on a liquid; foam.
- cathode-A negatively charged electrode, as of a storage battery,
or an electron tube.
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| Bibliography |
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Bibliography
Glossary
Industrial/ world Importance
Froth Flotation
General Information
Discovery |
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