Calculate the Operating Work Index
Operating work index has the same definition as “work index” (1) which states that “work index is the power required to break a material from a theoretically infinite feed size to 80% passing 100 micrometers.” Thus, by definition, work indices calculates from operating data always relate the operating data from which Wio is calculated to the same feed size and product size as given in the definition; namely, from a theoretically infinite feed size to 80% passing 100 micrometers.
Thus, operating work index can be used for in-plant grinding mill reporting and grinding studies such as:
- Record mill performance on an hourly, daily, weekly or monthly basis, whichever is desired.
- Compare current performance with past performance.
- Compare circuits in a multi-circuit plant.
- In plants with two or more grinding circuits, one or more circuits can be used as a standard, with others as test circuits for testing the effect of such variables as:
- mill speeds
- size of grinding media
- feed size
- product size
- amount of grinding media in mill
- liner designs
- liner wear
- changes in ores
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