which is controlled by the closing mesh size …What Is Bond Ball Mill Work Index. The grinding jar for the bond index rod mill is 12 x 24 in size and has a wave-shaped design.At least 15 to 20 kg sample material is required to simulate a closed grinding circuit in a ball or rod mill.The rod mill work index rwi is used for particle size determination in a size range from 25 mm down to 2.1 mm whereas ball mill work.The Bond Ball Mill Work Index (BBWi) test is carried out in a standardised ball mill with a pre-defined media and ore charge. The Work Index calculated from the testing can be used in the design and analysis of ball mill circuits. The test requires a minimum of 10kg of sample that has been stage-crushed to passing size of ,

and is often referred to as the Bond work index . The test is a 'locked-cycle' test where ground product is removed from test cycles and replaced by fresh feed. The test much achieve a steady-state before completion.Work index can change as a function of the product size of a Bond ball mill grindability test,

Ball mill work index adjustment The Bond ball mill work index test requires the operator to select an appropriate screen size to "close" the test. The procedure states that the closing screen size should be such that the product size of the …Work index can change as a function of the product size of a Bond ball mill grindability test,