Chloride-based Dissolution of Hardface Alloy Grinding Waste.
Ren-LD; Giroux-SM; Groves-RD; Seidel-DC
TMS Tech Paper A85-24 Metall Soc AIME Warrendale, Pennsylvania 1985 :15 pages
Dissolution studies were undertaken by the Bureau of Mines to develop a method for digesting hardface alloy grinding waste as a first step in recovering the valuable constituents. A successful laboratory method was devised that included solvent degreasing and dissolution in hot hydrochloric acid sparged with chlorine gas. Although satisfactory dissolution was also achieved by leaching separately with hydrochloric acid or chlorine gas, these two leaching systems produced liquors not amenable to subsequent processing because of a high tungsten concentration. When the combination hydrochloric acid-chlorine gas leach was used, the tungsten precipitated almost quantitatively, producing a liquor suitable for cobalt, nickel, and chromium recovery.
TMS Tech. Paper A85-24, Metall. Soc. AIME, Warrendale, PA, 1985, 15 Pp