Metallurgy — Chapter Summary
Tamil Nadu Board · Class 12 · Chemistry
Summary of Metallurgy for Tamil Nadu Board Class 12 Chemistry. Part of the Tamil Nadu Board Class 12 Chemistry syllabus.
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Overview
Metallurgy is the science and technology of extracting metals from their natural sources and refining them for practical use. In nature, only a few metals like gold, silver, and copper occur in their native state. Most metals are found as minerals in the form of oxides, sulfides, silicates, and carb
Key Concepts
A mineral is a naturally occurring
A mineral is a naturally occurring substance containing metals in free or combined state (oxides, sulfides, etc.). An ore is a mineral from which meta
Raw ores contain gangue (nonmetallic impurities
Raw ores contain gangue (nonmetallic impurities like rocky material and siliceous matter) that must be removed to increase metal concentration. Main c
Leaching dissolves metals into solution while
Leaching dissolves metals into solution while leaving gangue behind. Types include: (1) Cyanide leaching - gold is converted to [Au(CN)2]- complex; (2
Roasting heats sulfide ores with excess
Roasting heats sulfide ores with excess oxygen (below melting point) to convert them to oxides: 2PbS + 3O₂ → 2PbO + 2SO₂. Calcination heats ore withou
Metal oxides are reduced to metals
Metal oxides are reduced to metals using suitable reducing agents: (1) Carbon reduction - used for Zn, Mn, Cr where carbides don't form; (2) Hydrogen
Learning Objectives
- Understand the distinction between minerals and ores, and the importance of ore selection
- Describe various methods of concentrating ores to increase metal content
- Explain different extraction methods for obtaining crude metals from concentrated ores
- Apply thermodynamic principles and Ellingham diagrams to predict favorable reduction conditions
- Understand electrochemical methods for extracting metals of high reactivity
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Sources & Official References
Content is aligned to the official syllabus. Refer to the board website for the latest curriculum.
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