Petroleum Coke Steel Mills
petroleum coke steel mills Farmine Machinery. petroleum coke chicago news wttw. the dark, gritty piles rising five stories high line the bank of the calumet river. once, these piles were only coal. but with the demise of the steel mills and the recent shuttering of two coalfired power plants, the demand for coal has dropped. now the piles contain petroleum coke, or petcoke, .