In the cace of the batch grinding system utilizing the laboratory ball mill, it is necessary to distinguish between the inherent grinding-resistance of the sample itself and the grindability-obstructing effects of the reagglomeration of fine-particies. The grindability of the sample continuously change in accordance with the progress of grinding, because the contribution-rates of grindability-obstructing effect enlarge with the increase of the specific surface area.
Therefore, the indicating index for the degree of the grindability, that is Grindability-Index, should be considered as a function of the specific surface area.
We could have developed the equation for Grindability-Index given as a function of the specific surface area. We could have characterized that the constant “
a” is the indicating index for the coarsegrindability and the constant “
b” is the indicating index for the fine-grindability.
Gi=
KL(
a·
eb·S-1)
Gi: Grindability-Index (kWh/t)
S: Specific surface area (m
2/g)
a: Coarse-grindability constant
b: Fine-grindability constant
KL: Linearizing constant
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