Abstract
A laboratory method is described for the measurement under water, of the abrasiveness of a coal as it affects wear in pulverizers. The coal is ground by a rotating blade containing radioactive material. The determination of the level of radioactivity on the ground material provides an indication of the amount of material abraded from the blade. A coal which caused excessive wear in commercial grinding in a pin-disc mill gave an extremely high ‘abrasive index’ when subjected to this laboratory test. Abrasive indices have been determined for a series of New Zealand coals. High values correlate with increased ash level, with a high silica-to-alumina ratio in the ash and especially with a high free-silica content of the coal.
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