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Incorporation of Global Blast Furnace Sludge into Clayey Ceramic

The blast furnace is one the main systems used in steelmaking plants operating with iron ores. In addition to the production of pig iron and slag, the blast furnace operation also generates a considerable amount of wastes such as dust usually collected in the upwards flowing gas. The dust collecting stage, without separation procedures, produces a sludge, which cannot be recycled inside the plant due to the concentration of undesirable earth alkaline metals as well as zinc. A possible solution for this so-called global blast furnace sludge (GFS) is its incorporation, outside the plant, into clayey ceramic products processed at high temperatures. Therefore, the objective of the present work was to investigate the effect of GFS incorporation, in amounts of 5 and 10 wt%, into kaolinitic clay ceramics fired at 750, 950 and 1050oC. Initially, the GFS was characterized and, after processing, incorporated into ceramics that were then tested for the water absorption, linear shrinkage and flexural strength. It was found significant improvements in the properties for GFS incorporated ceramics fired at 1050oC.