Behavior of Components of Melts Similar in Composition to Nickel Concentrate and Nickel Matte at Directed Crystallization

摘要

The results of a study on the behavior of macrocomponents and admixtures at directed crystalliza-tion of two specimens of the Fe–Ni-S(Pt,Pd)system are presented in this paper.The composition of the spec-imens belonged to the areas of primary crystallization of a monosulphide solid solution((Fe_zNi_(1-z))S_(1+δ))andtaenite (Fe-Ni solid solution with the structure γ-Fe),which were similar in composition to nickel concentrateand nickel matte from the Norilsk Mining and Metallurgical Company (MMC). In this paper, data on the com-ponent distribution along the crystallized specimens are given, and the dependence of the component distribu-tion coefficients on the melt composition along the crystallization path is determined. The conditions underwhich one-phased crystallization becomes the crystallization of binary eutectics and then transforms to a four-phased invariant reaction are also determined. Some bounds of the possibility to use crystallization processesfor the separation of phases and components in the investigated system in a quasi-equilibrium regime of spec-imen solidification are analyzed.