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extraction of metals from it's ores

by the smelting process
by

Shandana Ahmed

on 25 October 2013

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Transcript of extraction of metals from it's ores

SMELTING
Extraction of metals from it's ores by Smelting
The heating of ore mixtures accompanied by a chemical change resulting in liquid metal. It is the process of converting ores, usually metal ores, in smelting furnaces to produce a final product in molten form.
now what's
..............
SmeltinG
????

Smelting is a form of extractive metallurgy; its main use is to produce a metal from its ore. This includes production of silver, iron, copper and other base metals from their ores.
The most common reducing agents are coke, carbon monoxide and hydrogen.Some examples are:
Fe O +3CO 2Fe + 3CO
WO + 3H W + 3H O
ZnO + C Zn + CO
Smelting involves more than just melting the metal out of its ore. Most ores are a chemical compound of the metal with other elements, such as oxygen (as an oxide), sulphur (as a sulfide) or carbon and oxygen together (as a carbonate). To produce the metal, these compounds have to undergo a chemical reaction. Smelting therefore consists of using suitable reducing substances that will combine with those oxidizing elements to free the metal.


ok!!!
lets talk about
"BLAST FURNACE"
What is a Blast Furnace?


A blast furnace is used for smelting iron oxide cores. It uses air to intensify combustion. It is usually used to produce metals and usually makes iron.
How does a Blast Furnace Work?
Blast furnaces heat up extremely hot and allow the components put in them to be manipulated at high levels of heat. Once removed the objects are cooled to maintain their form.
process of smelting !!!
Blast furnaces produce iron through a process known as smelting. It's actually smelting that allows any ore to be reduced down to its actual metal. In most furnaces, the combination of extreme heat and a reducing chemical agent such as coke does the job. The carbon or carbon monoxide produced when the coke is superheated displaces the oxygen in the ore. What results at the end is an actual metal such as iron.


how to shut down a blast furnace?
Blast furnaces are used to turn iron ore into pig iron by combining the ore with charcoal and limestone at extremely high temperatures. The pig iron can then be used to make cast iron or steel. Periodically, blast furnaces must be shut down, or blown out, to allow for cleaning and repairs. It is extremely dangerous to shut down a blast furnace, not just because of the intense heat of the furnace but also because of the presence of the LP gas in the furnace without the other elements to help control a possible explosion.


this prezi is based upon how metals are extracted from their ores,i hope that this prezi of mine helped you alot....give your feedback!!!!


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However, smelting of copper ore is done in two steps
1-The slag seperation
2-Bessemerization
1-The roasted copper ore is heated with coke and sand at about 1100 C.The materials melt and separate into two layers. The bottom layer that contains mixture of Cu S and FeS is called matte. While the upper layer is a silicate slag formed by the reaction of FeO and sand.


2FeS + 3O 2FeO + 2SO
FeO + SiO FeSiO
2-In the bessemerization process air is blown through the molten copper matte in a bessemerization converter.Any remaining iron sulphide (FeS) is oxidized and removed as slag (FeSiO ).In the final smelting step cuprous sulphide (Cu S) is oxidized to form cuprous oxide, which reacts with remaining cuprous sulphide to form metallic copper.
2Cu S + 3O 2Cu O + 2SO
Cu S + 2Cu O 6Cu + SO
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The product,called blister copper is about 97 to 99% pure Cu,with entrapped bubbles of SO .Bessemerization is also used to convert pure iron into steel.
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Shandana Ahmed
seperation through slag.undergo with the reaction,smelting consists of ,using suitable reducing substances
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