Bond work index, grindability

Test Method for Limestone Grindability and Calculation of Bond Work Index", Method 7. In FGD Chemistry and Analytical Methods Handbook , Vol. 2, EPRI Report CS 3612, July 1984. 

Other Tests. The so-called tumbler tests are usually used for testing material like coke, coal, iron ore pellets or tablets. They can be divided into drum tests and ball mill type tests. The latter type is used to derive both the Hardgrove Index and the Bond s Work Index, which are often used to classify the material friability as described in Sec. 3. They are generally more suited to coarse material. The Hardgrove Grindability test requires an initial size range form 595 to 1190 microns. 

Related Calculations. Although the Bond grindability test is run dry, the work index calculated above is for wet grinding. For dry grinding, the work index must be multiplied by a factor of 4/3. 

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