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Inorganic sludge generated from process of hot rolling coil in Chung Hung Steel Corporation (CHSC) was recycled at cement plants in western Taiwan before. However, recession of cement business in 2010 caused the unstable sludge recycling quantity and even stopped all recycling schedule in cement plants. To help subsidiary company make a long-term recycling plan, China Steel Corporation (CSC) and CHSC collaborated to apply a sludge recycling proposal to Industrial Development Bureau, Ministry of Economic Affairs (IDB). The hot rolling sludge can be recycled not only in cement plants but also in CSC's sludge-coal fly ash mixture system. Owing to this case, CHSC saves the additional cost of hot rolling sludge disposing and raises the added value of the related sludge as well.