In the standard A-C closed circuit ball mill grindability test the work index is found from where Pi is the opening in microns of the sieve mesh tested and Gbp is the net grams of mesh undersize produced per revolution of the 12″ x 12″ test ball mill. The closed circuit 80% passing size P averages P1/log 20 for all sizes larger than 150 mesh.
The Work Index was calculated based on the results of the test. 3. Results 3.1. Bond Grindability The grindability was calculated to be 1.21 g net undersize/revolution by averaging the results from the last 3 runs on the Bond Mill. The grindability is defined as the ease at which a mineral particle is reduced to a predetermined size and used to .
Bond Work Index (BWI) Test Celtest have the capability to carry out the Bond Work Index (BWI) Test in accordance with EPRI Report CS3612 : FGD Chemistry and Analytical Method Handbook Volume 2 . The BWI is used to estimate the required mill power per ton of product (Specific Energy).
The method requires the use of a reference ore of known work index. The reference ore is ground for a certain time (T) in a laboratory tumbling mill and an identical weight of the test ore is then ground for the same time.
Preparation of Test Feed Sample for Bond Work Index Procedure: Riffle 8-10 kilograms of minus half an inch feed into 500 gram charges. Riffle one 500 gram charge of ore down to splits of 125 grams each. Record the exact weight of one split; identify it as Feed No. 1.
The Bond work index is a measure of ore resistance to crushing and grinding and is determined using the Bond grindability test. Its value constitutes ore characteristic and is used for industrial .