ANS:A - pulse column

The equipment typically used in the extraction of highly corrosive radioactive liquids is the mixer settler. Mixer settlers are widely employed in the extraction process for their ability to efficiently separate immiscible liquids or extract specific components from a liquid mixture. They consist of a series of mixers and settlers where the mixture is agitated in the mixer section to promote mass transfer between the phases, and then allowed to settle in the settler section to allow the phases to separate based on density differences. In the case of highly corrosive radioactive liquids, mixer settlers offer several advantages such as:

1. Durability: They can be constructed from corrosion-resistant materials such as stainless steel or specialized alloys to withstand the corrosive nature of the radioactive liquids.
2. Efficiency: Mixer settlers provide efficient mixing and separation, ensuring high extraction efficiency while minimizing the risk of contamination or exposure.
3. Scalability: They can be designed in various sizes to accommodate different throughput requirements, making them suitable for both laboratory-scale research and industrial-scale production.
4. Safety: Mixer settlers can be operated remotely or in shielded environments to minimize the risk of personnel exposure to radiation.