The Activity of Calcium in Calcium-Calcium Halide Fluxes

摘要

The activities of calcium in the CaO_(satd.)-Ca-CaX_2 fluxes (X: Cl, Br, I) were measured as a function of the calcium composition at 1 473 K by equilibrating these fluxes with a solid zirconium plate. The activities decreased in the order CaCl_2, CaI_2 and CaBr_2 at the same calcium fraction of these fluxes. The observed activities are compared with those estimated using binary phase diagrams of the Ca-CaX_2 system. The possibility of the removal of phosphorus and the tramp elements such as arsenic, antimony, bismuth, lead and tin from carbon saturated iron using calcium-calcium halide fluxes is discussed.