Incorrect statement related to extraction of copper from copper pyrite is:

Options

A. Iron sllicate is obtained as slag
B. Copper matte in the form of `CuS + FeS` is obtained
C. Copper is obtained by self reduction
D. Blister copper is obtained after reduction process

Answer

To solve the question regarding the incorrect statement related to the extraction of copper from copper pyrite, we will analyze each statement provided in the context of the extraction process.

### Step-by-Step Solution:

1. **Understanding Copper Pyrite**:
- Copper pyrite is a mineral with the chemical formula CuFeS2. It is the primary ore of copper.

2. **Concentration of Ore**:
- The first step in the extraction of copper from copper pyrite is the concentration of the ore, which is typically done using the froth flotation process. This results in a concentrated ore.

3. **Roasting**:
- The concentrated ore undergoes roasting in the presence of oxygen. The reaction can be represented as:
\[ 2 \text{CuFeS}_2 + 5 \text{O}_2 \rightarrow 2 \text{Cu}_2\text{S} + 2 \text{FeS} + 4 \text{SO}_2 \]
- This process produces copper(I) sulfide (Cu2S), iron(II) sulfide (FeS), and sulfur dioxide (SO2).

4. **Smelting**:
- During smelting, the copper(I) sulfide reacts with oxygen to form copper(I) oxide (Cu2O) and sulfur dioxide:
\[ 2 \text{Cu}_2\text{S} + 3 \text{O}_2 \rightarrow 2 \text{Cu}_2\text{O} + 2 \text{SO}_2 \]
- Iron sulfide (FeS) reacts with oxygen to form iron(II) oxide (FeO) and sulfur dioxide:
\[ 2 \text{FeS} + 3 \text{O}_2 \rightarrow 2 \text{FeO} + 2 \text{SO}_2 \]
- The iron(II) oxide (FeO) then reacts with silica (SiO2) to produce iron silicate (FeSiO3), which is the slag.

5. **Formation of Copper Matte**:
- The copper(I) oxide (Cu2O) reacts with iron sulfide (FeS) to form copper matte (Cu2S and FeO).

6. **Bessemerization**:
- The copper matte is transferred to a Bessemerization chamber where it undergoes further reactions to produce blister copper. The reactions involve self-reduction:
\[ 2 \text{Cu}_2\text{S} + 3 \text{O}_2 \rightarrow 2 \text{Cu}_2\text{O} + 2 \text{SO}_2 \]
- The final self-reduction reaction produces blister copper:
\[ 2 \text{Cu}_2\text{O} + \text{Cu}_2\text{S} \rightarrow 6 \text{Cu} + 2 \text{SO}_2 \]

7. **Analyzing the Statements**:
- **Statement 1**: Iron silicate is obtained as a slag. (True)
- **Statement 2**: Copper matte is in the form of CuS and FeS. (False - it should be Cu2S and FeO)
- **Statement 3**: Copper is obtained by self-reduction. (True)
- **Statement 4**: Blister copper is obtained after the reduction process. (True)

### Conclusion:
The incorrect statement related to the extraction of copper from copper pyrite is that copper matte is in the form of CuS and FeS. The correct form is Cu2S and FeO.

### Final Answer:
**The incorrect statement is: Copper matte is in the form of CuS and FeS.**

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