Investigation of Second Contraction Difference between the Active Components and the Inertinite

Abstract

The method for separating the active component and the inertinite, respectively, in a lump coal was investigated, and it was confirmed that they could be separated from each other from microscopic observation. Then the methods for measuring the contraction of the active component and the inertinite were investigated. The author made a rod-shaped sample from a lump semicoke of the active component and the inertinite heated to 773 K for the measurement of contraction. Using rod-shaped samples had good results. The contraction of the active component was higher than that of the inert, confirming the trend that the higher the degree of coal carbonization, the lower the contraction of the active component.