The oceans pu t together may contain 1000 times as much uranium as in the mines on land — but in how much water? It is going to have to be cost effective to filter it out, before the oceans can be “mined” for uranium.
Well, that "is" the point of the technology described. Probably looking to do solvent extraction. Convert the uranyl ions into species "relatively" insoluble in water, but highly soluble in an organic, separate the immiscible phases, "break" the complex to free the uranium. Recycle the chelating agent and organic solvent.
Put the windmills to work....