Thermodynamic Principles Of Metallurgy
Chapter Name : General Principles And Processes Of Isolation Of Elements |
Sub Topic Code : 102_12_06_05_02 |
Topic Name : Thermodynamic Principles Of Metallurgy |
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Sub Topic Name : Applications |
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Introduction
• Oxides ores of Iron, after concentration through calcination/roasting (to remove water, to decompose carbonates and to oxidise sulphides) are mixed with limestone and coke and fed into a Blast furnace from its top. • In the Blast furnace, reduction of iron oxides takes place in different temperature ranges. • Limestone is also decomposed to CaO which removes silicate impurity of the ore as slag. The slag is in molten state and separates out from iron. • Cast iron is different from pig iron and is made by melting pig iron with scrap iron and coke using hot air blast. • It has slightly lower carbon content (about 3%) and is extremely hard and brittle.
Pre-Requisites:
Metals, Metallurgy, thermodynamics
Activity:
Iron comes In different varieties such as cast iron, pig iron, wrought iron and is used for different purposes.
Real Life Question:
How is Iron extracted from its ore?
Key Words / FlashCards
| Key Words | Definitions (pref. in our own words) |
|---|---|
| Metallurgy | • Metallurgy is the method involving the extraction of metals from their ores. |
Learning aids / Gadgets
| Gadgets | How it can be used |
|---|---|
| Iron rod, Copper wire | All these metals used to make different objects have originally been extracted from their ores. |
Real life uses :
Wrought iron is used to make gates, beds, furniture.
Places to visit :
Garage, furniture shop.
Practical examples around us
| Examples | Explainations |
|---|---|
| Iron rod, copper wire | • Metals used to make different objects have been extracted from their ores. |
What you learn in Theory:
• Oxides ores of Iron, after concentration through calcination/roasting (to remove water, to decompose carbonates and to oxidise sulphides) are mixed with limestone and coke and fed into a Blast furnace from its top. • In the Blast furnace, reduction of iron oxides takes place in different temperature ranges. • Limestone is also decomposed to CaO which removes silicate impurity of the ore as slag. The slag is in molten state and separates out from iron. • Cast iron is different from pig iron and is made by melting pig iron with scrap iron and coke using hot air blast. • It has slightly lower carbon content (about 3%) and is extremely hard and brittle.
What you learn in Practice:
• Metals are extracted by means of different methods.