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Chapter 21: Problem 6

What does roasting mean in metallurgy? Why is roasting a major source of air pollution and acid rain?

Short Answer

Expert verified
Roasting in metallurgy refers to the process of heating sulfide ores in air to convert them into oxides, preparing them for further purification. This process releases sulfur dioxide into the atmosphere which contributes to air pollution. When mixed with water vapor, sulfur dioxide forms sulfuric acid which leads to acid rain.

Step by step solution

01

Concept of Roasting

Roasting is a process in metallurgy in which sulfide ores are converted into oxides by heating them in air at high temperature. The purpose of roasting is to remove the sulfide and prepare the metal for further purification.
02

Environmental Impact of Roasting

During the process of roasting, as sulfide ores are heated, sulfide is oxidized to produce sulfur dioxide (\(SO_2\)). This \(SO_2\) is then released into the atmosphere.
03

Contribution to Air Pollution and Acid Rain

The sulfur dioxide (\(SO_2\)) released during roasting contributes significantly to air pollution. Additionally, when \(SO_2\) mixes with water vapor in the atmosphere, it forms sulfuric acid (\(H_2SO_4\)), which comes down with rainfall, causing acid rain. Acid rain can have harmful effects on plants, aquatic animals, and infrastructure.

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