Even with the best care, an old cast iron skillet may need to be replaced eventually. Whatever you do with it, don’t throw it away. Cast iron pots and pans are 100 percent recyclable and can be given to scrap metal dealers to made into new metal products. Iron is one of the most predominant materials in steel, and old cast iron is coveted to be recycled. Almost 50 percent of steel foundries use recycled scrap metal in their furnaces to make steel, so cast iron can be recycled forever.