Relationship between Caking Properties of Coal Measured by NMR and Coke Properties

Abstract

The evaluation method of caking property is crucial for coke-making technology. Generally, the Gieseler plastometry and dilatation tests are used to measure the caking properties of coals. But these tests have disadvantages when they're applied to non-or slightly caking coals. Most of non-or slightly caking coals can not be distinguished by the Gieseler plastometry test, nevertheless their coke strength indices are not identical. For blended coals consisting of coking coal and non-or slightly caking coals, there are no good relationships can be seen between caking property values of the coal blends measured by the Gieseler plastometry and strength indices of the cokes made from these coal blends.
New method for evaluating caking properties by NMR has been discussed. As a result, it was found that caking properties of non-or slightly caking coals could be evaluated by the NMR method. Furthermore, caking properties of coal blends consisting of coking coals and non-or slightly caking coals could be mea-sured by NMR method. As a result, NMR method for measuring caking property of coals has been developed.