Theoretical concept on slag-oxygen sensors to measure oxide activities related to FeO,SiO_2,and CaO contents of steelmaking slags

摘要

A theoretical concept is presented on the slag-oxygen sensors for in situ measurements of the FeO,SiO_2，andCaO contents of steelmaking slags in the furnace and in theladle. The purpose of this disclosure is to stimulate R & Dinterest in academia and technical institutes to further thedevelopment of new measuring devices applicable insteelmaking operations. The slag-oxygen sensor conceivedconsists of two dissimilar electrodes such that when immersedin molten slag there will be a difference in oxygen potentials atthe slag/electrode interface between the two electrodes,registering an open circuit cell emf. Examples are given ofdifferent types of electrodes for different oxides in the slag; also,equations are derived for the theoretical relation between theoxide activity and sensor emf reading.