"The whole process cost about $83 per kilogram of extracted uranium. That is twice as cheap as physical adsorption methods, which cost about $205 per kilogram, and four times as cheap as previous electrochemical methods, which cost $360 per kilogram."
https://oilprice.com/Alternative-Energy/Nuclear-Power/New-Era-of-Nuclear-Power-Hinges-on-Seawater-Uranium-Extraction.html