Which of the following ores are calcinared during extraction

Options

A. Argentite
B. Calamine
C. Azurite
D. Copper pyrites

Answer

To determine which ores are calcined during extraction, we need to understand the process of calcination and the nature of the ores provided in the options. Here’s a step-by-step solution:

### Step 1: Understand Calcination
Calcination is a thermal treatment process where ores are heated in the absence or limited supply of air. This process converts hydroxides, carbonates, and hydrated oxides into their respective oxides.

### Step 2: Analyze the Ores
We need to analyze each ore provided in the options to see if they can undergo calcination.

1. **Argentite (Ag2S)**:
- Argentite is a sulfide ore.
- **Conclusion**: It does not undergo calcination.

2. **Calamine (ZnCO3)**:
- Calamine is a carbonate ore.
- During calcination, it decomposes to form zinc oxide (ZnO) and carbon dioxide (CO2).
- **Conclusion**: It undergoes calcination.

3. **Azurite (2CuCO3·Cu(OH)2)**:
- Azurite is a carbonate and hydroxide ore.
- It can also be calcined to produce copper oxide (CuO) along with the release of CO2 and water.
- **Conclusion**: It undergoes calcination.

4. **Copper Pyrite (CuFeS2)**:
- Copper pyrite is a sulfide ore.
- It is typically concentrated and then roasted, not calcined.
- **Conclusion**: It does not undergo calcination.

### Step 3: Finalize the Answer
Based on the analysis, the ores that are calcined during extraction are:

- **Calamine (ZnCO3)**
- **Azurite (2CuCO3·Cu(OH)2)**

### Final Answer
The ores that are calcined during extraction are **Calamine and Azurite**.

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