Study on the Drum Test for the Measurement of the Strength of Coke

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On the drum test for the measurement of the strength of coke, the effects of the sampling spot, the size distribution of specimen and the number of drum revolution were studied. The sampling spot gives the largest effect on the drum test value. The sample from nesrest spot to the charger of coke into the blast furnace is best for the measuement of the strength of coke which is closely related to the operation of blast furnace. There happenes to be some bias by term or by plant in the relation between the drum test value measured on the sample from front of the wharf (or after the cutter) and from before the blast furnace. When the sample from front of the wharf is only available, the D'IR'-R+R'x method is recommendable which eliminates the impact history of specimen and the variation of pattern in the crushing curve. The drum test values measured on various sizes of specimen are closely related each other and accurately converted in comparison. However the breeze contained sample is recomendable to simply estimate the aceurate size dislribation of coke in blast furnace which governs the permeability. The drum test values measured on various numbers of drum revolution are closely related as far as the sampling spot is fixed, and the number of drum revolution may be chosen by the purpose.
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