Dependence of CRI and CSR on the Dimensions of Oriented Molecular Domains and the Ash Composition of the Coke

The reactivity CRI and mechanical strength CSR of coke are investigated as a function of the parameters of the oriented molecular domains within the coke (height L c and width L a of the packet of carbon layers). Industrial coke samples from MMK are investigated: they are tested to determine the reactivity CRI and mechanical strength CSR of the coke after reaction (State Standard GOST R 54250). A linear relation between M 10 and M 25 is confirmed in describing the results of Micum drum tests in an alternative parallel–serial configuration. Close correlations are found between the domain height L c before gasification and CRI and between L c after gasification and CSR . No such relations could be established for L a . It is found that, after gasification, the content of oxides such as Fe 2 O 3 , CaO, MgO, K 2 O, MnO, SrO, and SO 3 in the ash decreases. This probably indicates gasification over the whole of the coke piece and the entrainment of loose oxides by the carbon dioxide and carbon monoxide. Analysis of coke residues after drum tests indicates that coke pieces of different size exhibit different failure dynamics: the best CSR values are obtained for large coal pieces. Ideas are formulated regarding the influence of oriented molecular domains on the strength and reactivity of coke.