Recovery of flake graphite from steelmaking kish.
Laverty PD; Nicks LJ; Walters LA
Reno, NV: U.S. Department of the Interior, Bureau of Mines, RI 9512, 1994 Jan; :1-23
As part of its research efforts to encourage conservation and reuse of natural resources, the Bureau of Mines has developed a processing method 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. It is estimated that the graphite content of kish discarded by American steel plants is more than sufficient to meet the total U.S. demand for flake graphite. That need is now filled by natural graphite from foreign sources. Kish was treated by a combination of screening and hydraulic classification to produce a concentrate containing greater than 70 pct graphite. Leaching of the concentrate with hydrochloric acid solution gave a graphite product with 95 pct purity.
Flow-charts; Feasibility; Pilot-plants; Mineral-economics; Leaching; Beneficiation; Materials-recovery; Graphite; Steel-making
Report of Investigations
NTIS Accession No.
Reno, NV: U.S. Department of the Interior, Bureau of Mines, RI 9512