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High-temperature metallurgical slag (temperature, > 1450 °C) and highmoisture sludge (moisture content, > 80 wt%) are common wastes with huge outputs. Many problems, such as high cost, low level of harmlessness, and low efficiency, are encountered in current treatment methods. If these wastes can be recycled, they can be valuable secondary resources. Therefore, using the drum apparatuses to treat these two kinds of wastes is proposed. The process uses waste heat of slag to dry sludge with highdoi:10.2298/tsci200720303x fatcat:wka3wmaxa5hnhow3ghfvaqs5ym