Origin and Formation Mechanism of Coal Caking Property

QIN Zhi-hong; LI Xing-shun; CHEN Juan; ZHANG Li-ying; HOU Cui-li; GONG Tao

Abstract：The separation of high caking property components,weak and non-caking property components was realized by extraction and stripping process with carbon disulfide and N-meth-yl-2-pyrorolidone mixed solvents(CS_2/NMP)to two different rank coals.The analysis of FT-IR,GC/MS and caking index G_(R.I) were completed for each component.The origin and forma-tion mechanism of coal caking property were investigated.The results show that the high ca-king property and almost the same G_(R.I) value are presented in P_4+P_3 components separated from the two different ranks of coal.The G_(R.I) value of P_1component which has weak caking property varies with species of coals.The caking property of different rank coals mainly depends on the content of P_4+P_3,fellowed by the P_1,and the rank of coals(deciding the caking property of P_1)had also less effect on it.The active components of coal caking property are consisted of benzene,naphthalene,the anthracene and the Philippine and their series compounds as well as long alkanes which the active components have moderate structure and size,and could be trans-lated into liquid plastic mass during pyrogenation.The residues which have macromolecular structure give birth to gas,tar vapor,solids and little liquids.The more the caking active com-ponents in coals have,the more the liquid plastic mass could be produced during pyrogenation,and the stronger the caking property will be.