A: The relationship between grindability and coal properties and composition is more complicated. Because the structure of coal changes during the grinding process, the coal sample used for the grindability measurement is different from the particle size composition of the coal sample for general analysis. The former discards the fine powder, while the latter contains fine powder, so the latter contains fine powder. Even the same raw coal, the two physical and chemical properties will be different. Thus, the relationship between grindability and other indicators can only be comprehensively analyzed based on literature and a large number of test results. The general trend of wearability with coal quality is: dry ash-free volatiles (except for some anthracite) at 20% or higher, the wearability index is higher, that is, coal is easy to be ground; lower or higher than this value The wearable index gradually decreases. Therefore, in general, coking coal and low-volatility coal have a large wearability index and are easy to be ground. The carbon content of the coal (dry ashless base) is the most grindable between 86% and 88%; since the grindability of different minerals varies greatly, the coal with high ash does not necessarily have poor grindability. Because some minerals are less grindable than coal, it is often found that some high ash coals have lower grindability than low ash coal. External moisture has a certain influence on the grindability, so it is required that the sample should be air-dried before the measurement.
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Briefly describe the relationship between the millable index of coal and other indices?