Abstract
As part of its research efforts to encourage conservation and reuse of natural resources, the U.S. Bureau of Mines has developed a process to produce high-quality flake graphite from the steelmaking waste known as kish. The kish produced by current steelmaking practices is a mixture of graphite, desulfurization slag, and iron that is skimmed from the molten iron feed to the basic oxygen furnace. Kish was treated by a combination of screening and hydraulic classification to produce a concentrate containing more than 70% graphite. Acid leaching of the concentrate gave a graphite product with 95–99% purity and a flake size ranging from 10 mesh down. Industrial graphite users indicated that kish graphite is a suitable substitute for natural graphite material for most uses.
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