Select the correct statements for calcination :

Options

A. Carbonate ore is converted in oxide ore
B. Hydrated oxide ore is converted into its oxide ore
C. Oxidisable volatile impurities are removed by calcination process
D. Only calcination occurs for carbinate or oxide ore

Answer

### Step-by-Step Solution:

1. **Definition of Calcination**:
- Calcination is a thermal treatment process that involves heating a substance to high temperatures in the absence or limited supply of air. It is primarily used to remove volatile substances or to drive off carbon dioxide from carbonate ores.

2. **Origin of the Term**:
- The term "calcination" is derived from the Latin word "calcinere," which means "to burn lime." This reflects its most common application, which involves the decomposition of calcium carbonate (CaCO₃).

3. **Common Application**:
- The most notable application of calcination is the conversion of calcium carbonate (limestone) into calcium oxide (quicklime) and carbon dioxide (CO₂). The reaction can be represented as:
\[ \text{CaCO}_3 \, (s) \rightarrow \text{CaO} \, (s) + \text{CO}_2 \, (g) \]

4. **Purpose of Calcination**:
- The main purpose of calcination is to produce calcium oxide, which is used in various applications, including the production of cement.

5. **Characteristics of Calcination**:
- During calcination, carbonate ores and hydrated oxides are converted into oxides. This process occurs in the absence of air or with limited air supply, which is crucial for preventing oxidation of the material.

6. **Correct Statements**:
- Based on the information provided, the correct statements for calcination are:
- Option A: Calcination refers to the process of converting carbonate ores into oxides.
- Option B: Calcination occurs in the absence or limited supply of air.

### Final Answer:
The correct statements for calcination are Options A and B.

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