Heating pyrites to remove sulphur is called

Options

A. smelting
B. calcination
C. liquation
D. roasting

Answer

To solve the question "Heating pyrites to remove sulphur is called," we can follow these steps:

### Step-by-Step Solution:

1. **Understand the Context**:
- Pyrites, also known as iron sulfide (FeS2), contain sulfur that needs to be removed.

2. **Identify the Process**:
- The process of heating ores in the presence of oxygen to remove sulfur is known as roasting.

3. **Explain the Roasting Process**:
- During roasting, the ore is heated in the presence of excess air (oxygen). This leads to the conversion of the sulfide ore into its oxide form, while sulfur is released as sulfur dioxide (SO2).

4. **Provide an Example**:
- For instance, when zinc sulfide (ZnS) is roasted, it is converted into zinc oxide (ZnO) and sulfur dioxide (SO2).

5. **Conclusion**:
- Therefore, the correct term for heating pyrites to remove sulfur is "roasting."

### Final Answer:
Heating pyrites to remove sulphur is called **roasting**.

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