Correlation of plastic layer characteristic index of mainly coking coal
The plastic layer properties of coking coal are crucial factors that influence the coking process and the quality of coke.Studying properties like fluidity,adhesion,swelling,and their correlations can serve as a basis for a comprehensive evaluation of plastic layer quality,guiding coking coal blending.Through detailed analysis of 16 co-king coals from different mining areas in China,including the proximate analysis,plastic layer index,Audibert-Ar-nu dilatation,and Gieseler fluidity,we have deeply investigated the correlation between Gieseler fluidity(MF)and key caking indexes,such as Audibert-Arnu dilatation(a+b),maximal plastic layer thickness(Y),and bond in-dex(GR.I).Additionally,we further explored the correlations between the maximum fluidity(lgMF)and the initial softening temperature(Ts),maximum fluidity temperature(Tmax),solidification temperature(Tr),and plasticity temperature range(△T)in conjunction with the temperature characterization parameters.The results indicated that the lgMF of the coal samples exhibited a quadratic curve correlation with a+b,Y and GR.I,with correlation coeffi-cients(R2)of 0.749 1,0.816 1,and 0.760 4,respectively.The correlation was significantly influenced by the type of coal.lgMF showed a stronger correlation with Ts:as lgMF increased,Ts generally decreased,with a correla-tion coefficient of 0.814 2 for the quadratic regression curves.The correlation between lgMF and Tmax,lgMF and Tr was found to be weak.A notable correlation was observed between lgMF and △T,where an increase in lgMF corre-sponded to a gradual increase in △T,with a correlation coefficient of 0.871 2 for the quadratic regression curve.
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