This morning in metals news: Oslo-based Norsk Hydro has reached an agreement with a Brazilian university to explore the potential uses of bauxite residue from its mining operations; US natural gas-fired generation declined over the first four months of the year; and existing-home sales fell in April. Norsk Hydro to explore uses of bauxite residue mehaniq41/Adobe Stock Norsk Hydro recently announced it has reached a research agreement in which it aims to research uses of bauxite residue from its mining operations in the Brazilian state of Pará. “The research will focus initially on using this waste in the production of cement floors that prove to be advantageous from the environmental point of view and throughout their life cycle,” Norsk Hydro said.