서천 장암진성 부지 내 제철유적 출토 슬래그 분석을 통한 제련온도 연구
A Study on Smelting Temperature through analysis of Slag Excavated from Iron Manufacturing Remains on Site of Jangamjinseong in Seocheon, Korea
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서천 장암진성 부지 내 제철유적 출토 슬래그 4점을 대상으로 주성분, 결정구조, 미세조직, 시차열분석을 진행하여 제련온도를 연구하였다. 주성분 분석결과 전철량과 조재량의 함량은 직접제련 슬래그의 특징을 보였다. 결정구조 분석결과 Fayalite(Fe2SiO4), Wustite(FeO)가 검출되었고 미세조직 분석결과 Glass Matrix 위에 Fayalite와 Wustite가 존재하였다. 시차열분석결과No.1은 1,132.0℃ 정도의 흡열 피크에선 Fayalite가 용융되고. 1,370.0℃ 정도에서는 Wustite의용융이 이루어졌다. No.2는 1,096.0℃ 정도의 흡열 피크에선 Fayalite가 용융되었으며, 1,311.0℃정도에서는 Wustite가 용융됨을 알 수 있었다. FAS⋅FCS 삼원상태도 분석결과 제련온도 범위는 1,150.0∼1,250.0℃였다. FeO-SiO2 이원상태도 결과 Wustite + Fayalite 상에서 Fayalite가 용융되어 Wustite + Liquid 상이 된 범위였다. 시차열분석결과와 종합하면 제련온도의 범위는1,096.0∼1,370.0℃였다. 모든 분석결과를 종합하면 서천 장암진성 부지 내 제철유적은 직접제련법을 사용하였으며, 공정 시 1,096.0∼1,370.0℃ 범위에서 진행됨을 확인할 수 있었다.
Abstract
This study studied the smelting temperature by the principal components, crystal structure,microstructure, and differential thermal analysis on four slags excavated from iron manufacturingremains 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 thedirect 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 theGlass Matrix. As a result of differential thermal analysis, Fayalite was melted at an endothermic peakof 1,132.0°C. At 1,370.0°C, Wustite was melted. In No. 2, it was found that Fayalite melted at anendothermic peak of 1,096.0°C, and Wustite melted at 1,311.0°C. As a result of the analysis of theFAS ternary phase diagram and the FCS ternary phase diagram, the smelting temperature range was1,150.0 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 thermalanalysis, the range of the smelting temperature is 1,096.0°C to 1,370.0°C. To sum up all the resultsof 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.
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