Which of the following statement is incorrect about the extractive metallurgy of coper?

Options

A. Matte chiefly consists of cuprous sulphide and some ferrous
sulphide
B. Most of the impurity of iron sulphide is removed as fusible slag
during roasting
C. The copper pyrites is concentrated by froth floatation process
D. The copper obtained from Bessemer converter is called as blister copper.

Explanation

To solve the question regarding the incorrect statement about the extractive metallurgy of copper, we will analyze each of the given statements based on the processes involved in copper extraction.

### Step-by-Step Solution:

1. **Understanding Extractive Metallurgy of Copper**:
- Extractive metallurgy of copper involves several steps: concentration, roasting, smelting, and refining.
- The primary ore for copper extraction is copper pyrite (CuFeS2).

2. **Concentration of Copper Ores**:
- The first step is the concentration of copper ores by the froth flotation process. This separates the copper minerals from the gangue.

3. **Roasting**:
- After concentration, the copper sulfide ores are roasted in a reverberatory furnace. This converts the sulfides into oxides and produces a mixture known as matte, which contains copper(I) sulfide (Cu2S) and iron sulfide (FeS).

4. **Smelting**:
- The matte is then mixed with silica and coke and heated in a blast furnace. During this process, iron oxides combine with silica to form slag (FeSiO3), and copper is extracted as blister copper.

5. **Analyzing the Statements**:
- **Statement 1**: "The matte consists of cuprosulphide and some ferrous matte."
- This statement is correct because the matte does contain Cu2S and FeS.

- **Statement 2**: "Most of the impurity of iron sulphide is removed as the fusible slag during roasting."
- This statement is incorrect. The impurities are removed during the smelting process, not roasting. During roasting, the sulfides are converted to oxides, but the slag formation occurs during smelting.

- **Statement 3**: "Copper pyrite is concentrated by froth flotation."
- This statement is correct as it accurately describes the concentration process.

- **Statement 4**: "Copper obtained from the Bessemer converter is called blister copper."
- This statement is also correct. Blister copper is the impure copper obtained after smelting.

6. **Conclusion**:
- The incorrect statement regarding the extractive metallurgy of copper is: "Most of the impurity of iron sulphide is removed as the fusible slag during roasting."

### Final Answer:
The incorrect statement is: "Most of the impurity of iron sulphide is removed as the fusible slag during roasting."

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