Origin and Formation Mechanism of Coal Caking Property

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-methyl-2-pyrorolidone mixed solvents (CS2/NMP) to two different rank coals.The analysis of FTIR,GC/MS and caking index GR.Iwere completed for each component.The origin and formation mechanism of coal caking property were investigated.The results show that the high caking property and almost the same GR.Ivalue are presented in P4+P3components separated from the two different ranks of coal.The GR.Ivalue of P1 component which has weak caking property varies with species of coals.The caking property of different rank coals mainly depends on the content of P4+P3,fellowed by the P1,and the rank of coals (deciding the caking property of P1) 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 translated 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 components in coals have,the more the liquid plastic mass could be produced during pyrogenation,and the stronger the caking property will be.