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Synopsis : An investigation has been made on the electrochemical behavior of various compounds as non-metallic inclusion in steel, in order to separate calcium sulfide from calcium oxide. A method developed for the state analysis of Ca in steel, was summerized as follows : (1) Ca as inclusion : Steel sample is dissolved electrolytically in the methanol solution containing 3% methyl salicylate, 1% salicylic acid and 1% tetramethylammonium chloride, and the amount of Ca in the obtained electrolytic residue is determined. (2) Ca dissolved in steel : Calculated by subtracting the amount of Ca as inclusion from total amount of Ca in steel. (3) Ca as oxide : Electrolytically extracted residue from steel is mixed with Cu powder, and pressed into a disk. The disk was electrolysed in the methanol solution containing 10% acetylacetone and 1% tetramethylammonium chloride, and the amount of Ca in the insoluble residue is determined. Fe3C and MnS extracted from steel are decomposed by this secondary electrolysis procedure. (4) Ca as sulfide : Calculated by subtracting the amount of Ca as oxide from the amount of Ca as inclusion.

State Analysis of Ca in Steel by Electrochemical Separation Technique