The Bureau of Mines is conducting studies of slags related to ferrous technology to find and evaluate acceptable substitutes for the auxiliary flux, fluorspar, in foundry operations. This work is directed toward the Bureau's goal of minimizing the nation's dependence on scarce and critical minerals. Viscosity-temperature relations were determined using colemanite, fused boric acid, ilmenite, and fluorspar as fluidizers in both simulated and actual cupola slags. The colemanite, fused boric, and ilmenite were effective fluidizers of simulated cupola slag and for cupola trials provided satisfactory fluid slags with no operational problems. The colemanite and fused boric acid, however, caused lining attack, and the iron produced during their use contained boron, which could be detrimental to the final product. The iron produced using ilmenite as a slag fluidizer showed increased levels of titanium. Slags fluidized with fluorspar were not stable, and high fluorine levels occurred in samples of water and sludge from the scrubber and stack.
Trans. 82D Casting Cong. & Expo., Am. Foundrymen Soc., Detroit, 4/24-28/78, V. 86, PP. 563-572