As the content of ash and its components determine such important properties of coals as bituminosity, ash-melting temperature, and ash slagability, they can affect the technological processes of coal preparation, combustion, and coking [1-5]. Their role in the concentration of microelements in coals is also well known [6, 7]. At the same time, these properties differ for different type of coals, implying the following question: What is the relation between the petrographic composition of coals and their ash components? Although this problem was discussed in the papers [2, 8], its discussion was done in general, dealing with the formation of the humates of "ash" chemical elements.
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