Question

Xanthates are used as:

• A. Collectors
• B. pH reagents
• C. Moderators
• D. Frothers

Hint:

Xanthates are key reagents in froth flotation — they act as \textbf{collectors} to selectively bind to sulphide ores and aid in their separation.

Answer 1

The Correct Option is A

Step 1: Understanding Froth Flotation and Reagents
In the froth flotation process used in mineral processing, various reagents are added to selectively separate hydrophobic (valuable) and hydrophilic (waste) particles. These include:
Collectors: Increase the hydrophobicity of mineral particles.
Frothers: Help stabilize the froth.
pH Modifiers: Adjust the solution pH.
Depressants and Activators: Modify the surface properties for selective separation. Step 2: Role of Xanthates
Xanthates (such as potassium ethyl xanthate) are widely used as collectors in the flotation of sulphide ores like galena (\( \text{PbS} \)) and sphalerite (\( \text{ZnS} \)). They adsorb onto the surface of the mineral particles, making them water-repellent and promoting their attachment to air bubbles. Step 3: Eliminating Other Options
- pH reagents and Moderators serve different purposes.
- Frothers stabilize the froth but xanthates do not function this way. Conclusion: Xanthates are used as collectors in froth flotation.