A Study on Smelting Temperature through analysis of Slag Excavated from Iron Manufacturing Remains on Site of Jangamjinseong in Seocheon, Korea

Abstract

This study studied the smelting temperature by the principal components, crystal structure, microstructure, and differential thermal analysis on four slags excavated from iron manufacturing remains on site Jangamjinseong in Seocheon, Korea. As a result of the principal component analysis, the content of the T⋅Fe and Deoxidation agent which was the same as the characteristics of the direct smelting slag. As a result of the crystal structure analysis, Fayalite(Fe₂SiO₄) and Wustite(FeO) were detected. and as a result of microstructure analysis, Fayalite and Wustite were present on the Glass Matrix. As a result of differential thermal analysis, Fayalite was melted at an endothermic peak of 1,132.0°C. At 1,370.0°C, Wustite was melted. In No. 2, it was found that Fayalite melted at an endothermic peak of 1,096.0°C, and Wustite melted at 1,311.0°C. As a result of the analysis of the FAS ternary phase diagram and the FCS ternary phase diagram, the smelting temperature range was 1,150.0 to 1,250.0°C. The FeO-SiO₂ binary state is also a range in which Fayalite is melted on Wustite + Fayalite to become a Wustite + Liquid phase. When combined with the results of differential thermal analysis, the range of the smelting temperature is 1,096.0°C to 1,370.0°C. To sum up all the results of the analysis, the steel relics in the site of Jangamjinseong in Seocheon used a direct smelting method, and were carried out in the range of 1,096.0℃ to 1,370.0℃ during the process.