Concentration of copper glance is done by

Options

A. Leaching
B. Magnetic separation
C. Hydraulic washing
D. Froth Floation method

Answer

### Step-by-Step Solution:

1. **Identify the Ore**: The ore in question is copper glance, which is also known as chalcopyrite. Its chemical formula is CuFeS₂, indicating that it is a sulfide ore.

2. **Understand the Concentration Process**: Concentration of ores involves the removal of impurities and increasing the percentage of the desired metal. For sulfide ores like copper glance, specific methods are employed.

3. **Select the Appropriate Method**: The most suitable method for concentrating copper glance is **froth flotation**. This method exploits the differences in the surface properties of the minerals.

4. **Explain Froth Flotation**: In froth flotation, the crushed ore is mixed with water and chemicals that make the copper sulfide particles hydrophobic (water-repellent). Air is then bubbled through the mixture, causing the hydrophobic particles to attach to the bubbles and rise to the surface, forming a froth.

5. **Collect the Concentrate**: The froth, which contains the concentrated copper glance, is skimmed off from the surface, while the gangue (unwanted material) sinks to the bottom.

6. **Conclusion**: Therefore, the concentration of copper glance is effectively done using the froth flotation method.