Sulphur removal by heating of pyrite ore in presence of air is called its ____________________?
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Answer: B. Roasting
Explanation
Roasting pyrite ore in air oxidizes it to remove sulfur as sulfur dioxide gas. Thermal treatment with oxygen converts iron sulfides into metal oxides while releasing sulfur gases. This crucial pyrometallurgical step prepares raw mineral ores for subsequent smelting operations. Roasting involves heating solid mineral ores in the presence of excess air below their melting points. Pyrite, or iron disulfide, is commonly roasted to produce sulfur dioxide for industrial sulfuric acid plants. The exothermic reaction releases significant heat that can be recovered to generate steam and electricity.
Sulfuric acid manufacturing plants rely heavily on sulfur dioxide generated from roasting sulfide ores. Metallurgical processing uses roasting to eliminate volatile impurities before extracting pure metal from ores. Environmental regulations require modern roasters to capture sulfur dioxide emissions to prevent acid rain. Reduction involves removing oxygen or adding electrons, which is the opposite of roasting oxidation. Calcination heats ores to remove volatile matter without substantial oxidation, typically performed without air. Smelting melts the roasted ore at higher temperatures to separate molten metal from slag impurities.
- Subject
- Engineering
- Category
- Chemical Engineering
- Topic
- —
- Difficulty
- medium
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