시멘트 클링커 특성에 미치는 합성수지류의 영향 분석
Effects of Synthetic Resin on Characteristics of Cement Clinker
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시멘트 클링커 소성공정은 주연료인 유연탄과 함께 다양한 대체연료를 사용하고 있다. 합성수지 등의 대체연료는 클링커 물성에 영향을 줄 수 있으며, 최종 시멘트 물성도 변화시킬 수 있다. 따라서 본 연구에서는 PP, PE, PS 및 PVC 등을 클링커용 성구와 동시 소성하여클링커 물성에 미치는 영향을 분석하였다. PP 등의 발열량은 9,000~11,000kcal/kg이었으나, PVC는 약 6,000kcal/kg 수준이었다. 또한PVC의 열분해 과정은 2단계로 진행되었으며, 열분해 시작/종료 온도는 각각 169℃ 및 573℃이었다. PP 등의 수지 연소 클링커의free-CaO 함량은 약 0.2±0.06%이었으나, PVC 연소 클링커는 7.11%로 매우 높은 값을 나타내었다. PVC 연소 클링커의 염소 함량은3.77%로 매우 높았으며, XRD 분석을 통해 chlormayenite(11CaO ․ 7Al2O3 ․ CaCl2) 결정 생성도 확인되었다. 하지만 PP 등을 연소한 클링커는 Ref. 클링커(수지 미연소)와 유사한 물성이 발현되어, 클링커 대체연료로 충분히 사용될 수 있다는 것을 확인하였다.
Abstract
Various alternative fuels are used together with bituminous coal in the cement clinker burning process. Alternative fuels such as synthetic resins can affect the clinker properties and can change the final cement properties. In this study, PP, PE, PS, and PVC were burned to analyze the effect on the clinker properties. The calorific value of PP and etc., was 9,000 to 11,000 kcal/kg, but PVC was about 6,000 kcal/kg. In addition, the pyrolysis process of PVC proceeded in two stages, and the start/end temperatures of pyrolysis were 169℃ and 573℃. The free-CaO content of the resin combustion clinker was about 0.2±0.06%, but the PVC combustion clinker showed a very high value of 7.11%. The chlorine content of the PVC combustion clinker was very high at 3.77%, and it was confirmed by XRD analysis that chlormayenite were formed as clinker crystal. However, the clinker burned with PP and etc., exhibited similar physical properties to Ref. clinker (Resin non-combustion). So, it was confirmed that it could be sufficiently used as a alternative fuel for clinker.
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