Electromagnetic seperation is used in the concentration of

Options

A. Copper pyrite
B. Bauxite
C. Cassiterite
D. Cinnabar

Answer

To solve the question regarding which ore is concentrated using electromagnetic separation, we can follow these steps:

### Step 1: Understand the Electromagnetic Separation Method
Electromagnetic separation is a technique used to separate magnetic materials from non-magnetic materials. This method is particularly effective when the ore contains both magnetic impurities and non-magnetic ore particles.

**Hint:** Look for ores that contain magnetic impurities for this method.

### Step 2: Analyze the Given Options
The options provided are:
1. Copper pyrite (CuFeS2)
2. Bauxite (Al2O3·2H2O)
3. Cassiterite (SnO2)
4. Cinnabar (HgS)

**Hint:** Identify the nature of each ore and its impurities.

### Step 3: Evaluate Each Ore
- **Copper Pyrite (CuFeS2):** This is a sulfide ore and is typically concentrated using the froth flotation process, not electromagnetic separation.

- **Bauxite (Al2O3·2H2O):** Bauxite is the ore of aluminum and is separated using chemical methods like leaching, not electromagnetic separation.

- **Cassiterite (SnO2):** Cassiterite is the ore of tin and often contains impurities like wolframite (FeWO4), which is magnetic. This makes cassiterite suitable for electromagnetic separation.

- **Cinnabar (HgS):** Cinnabar is a mercury ore and is also concentrated using the froth flotation process.

**Hint:** Focus on the presence of magnetic impurities in the ores.

### Step 4: Conclusion
Based on the analysis, cassiterite (SnO2) is the only ore listed that can be effectively concentrated using electromagnetic separation due to the presence of magnetic impurities (wolframite).

**Final Answer:** Electromagnetic separation is used in the concentration of **cassiterite (SnO2)**.