Electric arc, and ladle, furnaces 10 have components 14 with a high-emissivity/high reflectivity layer 18 disposed on the hot face 16. The component 14 includes a water-cooled panel 40, a duct 34, roof 12 frame 38, pipes, dry delta 36, water-cooled delta 28, fourth hole elbow 32, fourth hole roof 42, side walls 26 and combinations thereof. The high-emissivity/high-reflectivity layer 18 comprises, in dry admixture, from about 5% to about 40% of an inorganic adhesive, from about 45% to about 92% of a filler, and from about 1% to about 25% of one or more emissivity agents.

A spray cooling system having a cleanout trap for use in a sidewall or roof of a metallurgical furnace is disclosed herein. The spray cooling system has a header fluidly coupled to a coolant source, a spray conduit fluidly coupled to the header for receiving coolant flowing from the header and one or more nozzles fluidly coupled to spray conduits. The nozzles are configured to receive coolant from the spray conduit and spray, mist or otherwise direct the coolant from spray conduit onto a surface of the sidewall or roof for cooling. The spray cooing system has a cleanout trap fluidly coupled thereto. The cleanout trap is configured to remove particulate from the coolant flowing through the cleanout trap prior to the coolant flowing through the nozzles.