At least three companies including Glencore and Trimet Aluminium have expressed an interest in buying Rio Tinto’s aluminium assets in Iceland, Sweden and the Netherlands for up to $350-million, banking sources said. Rio Tinto restarted the sale process for the assets in late 2018, with the help of French investment bank Natixis, sources previously said, after Norwegian aluminium company Norsk Hydro pulled out of buying them, blaming a delay in getting European Commission approval.