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Chapter 6: Problem 15

Identify the reaction that does not take place during the smelting process of copper extraction. (a) \(\mathrm{Cu}_{2} \mathrm{O}+\mathrm{FeS} \longrightarrow \mathrm{Cu}_{2} \mathrm{~S}+\mathrm{FeO}\) (b) \(\mathrm{FeO}+\mathrm{SiO}_{2} \longrightarrow \mathrm{FeSiO}_{3}\) (c) \(2 \mathrm{Cu}_{2} \mathrm{~S}+3 \mathrm{O}_{2} \longrightarrow 2 \mathrm{Cu}_{2} \mathrm{O}+2 \mathrm{SO}_{2} \uparrow\) (d) \(2 \mathrm{FeS}+3 \mathrm{O}_{2} \longrightarrow 2 \mathrm{FeO}+2 \mathrm{SO}_{2} \uparrow\)

Short Answer

Expert verified
Reaction (b) \text{(\text{FeO}+\text{SiO}_2 \rightarrow \text{FeSiO}_3)} does not take place during the smelting process of copper extraction.

Step by step solution

01

Understanding Smelting Process

The smelting process of copper extraction involves several steps including roasting and reduction to obtain copper metal from its ores. Reactions in smelting include the combination of copper(I) oxide with iron sulfide to form copper sulfide and iron(II) oxide, and the oxidation of copper sulfide to form copper(I) oxide and sulfur dioxide gas.
02

Analyzing Option (a)

In reaction (a), copper(I) oxide reacts with iron sulfide to produce copper(I) sulfide and iron(II) oxide. This is part of the smelting process where sulfide ores are converted to oxides.
03

Analyzing Option (b)

Reaction (b) involves the formation of iron silicate (slag) from iron(II) oxide and silicon dioxide. This is a reaction that occurs in the smelting process to remove impurities as slag, not directly related to the extraction of copper.
04

Analyzing Option (c)

In reaction (c), copper(I) sulfide is oxidized by oxygen to produce copper(I) oxide and sulfur dioxide gas. This is part of the smelting process, often seen in the roasting phase where sulfides are oxidized to oxides.
05

Analyzing Option (d)

Reaction (d) is the oxidation of iron sulfide by oxygen to form iron(II) oxide and sulfur dioxide gas. This reaction might occur in the context of the smelting process but is not directly related to the extraction of copper, instead it relates to the processing of iron in the presence of copper ore.
06

Determining the Incorrect Reaction

Upon analyzing the reactions, reaction (b) is identified as the one not involved in the smelting process of copper extraction. It is a slag formation reaction, which although important for impurity removal, does not directly involve the compounds being extracted for copper.

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Key Concepts

These are the key concepts you need to understand to accurately answer the question.

Copper Extraction Chemistry
The amazing journey of copper from its raw sulfide ores to the shiny metal we use in wires and pipes starts with the complex chemistry of extraction.

To unlock copper from its ore, a process called smelting is used. This entails heating the ore to a temperature where chemical reactions can take place to separate the copper from other elements. You might have encountered a common reaction where copper(I) oxide and iron sulfide react to form copper(I) sulfide and iron(II) oxide (reaction a from the exercise). This is a key step in copper smelting, showcasing how different elements can be shuffled around to isolate the metal we're after.
Sulfide Ores Roasting
If you've ever roasted marshmallows, you know that heat changes things – and it's similar with sulfide ores in metallurgy. Roasting sulfide ores is like prepping them for the big dance of chemistry that is smelting.

During roasting, the sulfide ores are heated in air at high temperatures. An exemplary reaction (reaction c from the exercise) occurs when copper(I) sulfide is heated with oxygen to result in copper(I) oxide and sulfur dioxide, which is given off as a gas. This step is crucial, as it turns the sulfides into oxides and releases sulfur as sulfur dioxide, a byproduct that can be captured and further processed.
Smelting Impurities Removal
Like panning for gold to separate the precious nuggets from the mud, smelting includes the removal of impurities to get to the copper.

When we look at reaction (b), it isn't directly involved in the extraction of copper, but is still integral to the process as it deals with impurities. The iron(II) oxide from other reactions can combine with silicon dioxide to form iron silicate, also known as slag. Slag is less dense than the molten metal, so it floats on top and can be easily removed. This is how the purity of the extracted metal is improved, ensuring that the resulting copper is of high quality and free from undesirable elements.

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Most popular questions from this chapter

Which compound is formed when excess of \(\mathrm{KCN}\) is added to an aqueous solution of copper sulphate? (a) \(\mathrm{Cu}(\mathrm{CN})_{2}\) (b) \(\mathrm{K}_{2}\left[\mathrm{Cu}(\mathrm{CN})_{6}\right]\) (c) \(\mathrm{K}\left[\mathrm{Cu}(\mathrm{CN})_{2}\right]\) (d) \(\mathrm{K}_{3}\left[\mathrm{Cu}(\mathrm{CN})_{4}\right]\)

Which of the following is not an ore of iron? (a) Magnetite (b) Limonite (c) Cassiterite (d) Haematite

Which of the following statements is incorrect? (a) Lead is refined by electrolysis of \(\mathrm{PbSiF}_{6^{-}}\) (b) Red lead \(\left(\mathrm{Pb}_{3} \mathrm{O}_{4}\right)\) is known as minium (c) Yellow lead oxide \((\mathrm{PbO})\) is known as massicot. (d) None of these

The chemical processes in the production of steel from haematite ore involve: (a) Reduction (b) Oxidation (c) Reduction followed by oxidation (d) Oxidation followed by reduction

Wrought iron, pig iron and steel differ in properties due to: (a) Carbon content (b) Softness (c) Conductivity (d) Malleability
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