Bond Ball Mill Work Index Xsm Bond Ball Mill Work Index Xsm AMIT 135 Lesson 7 Ball Mills Circuits Work Index Bond estimated the amount of wear in terms of kilograms per kWh based on the abrasion index A i.e Wet Ball Mill = kg kWh = 0.16 A i 0.015 0.33 Dry Ball Mill = kg kWh = 0.023A i 0.5 Replacement Ball get price
A Bond Ball Mill Work Index may also be used in the simulation and optimisation of existing mill and the associated grinding circuit. Sample requirements: A minimum of 8 kg of material crushed to nominally minus 10 mm is preferred. JKTech would stage crush the sample to minus 3.35 mm, as required for the Bond Ball Mill Work Index test feed.
JK Bond Ball Mill Test Since its introduction in the 1960s, the Bond Ball Mill Work Index parameter has been extensively used in predicting ball mill power draw. Use of Work Index Along with comminution circuit design the work index parameter is widely used in tracking mill performance. Due to the age and lack of controls for the test,
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In a recent publication fifteen different ores each had grindability tests made at 28, 35, 48, 65 and 100 mesh, with many work index variations at the different product sizes. These tests are used here to develop empirical equations from which the work index at different product sizes can be computed from a grindability test at one size. In each of the 15 ores the data from the grindability test at 48 mesh alone were used to calculate the Wi values at 28, 35, 65, and 100 mesh, and these were compared with the actual values obtained by testing. In the calculation the exposure ratio Erp of each mesh product size was considered to be that determined by testing at 48 mesh, and Crp was determined from that value and the average P for each mesh size. The work index should theoretically be proportional to P/Yn where Y is the percent weight of the feed retained on the mesh size tested. From this relationship Wi = K P/Y 1.67.. the exponent...
The specific crack length Cr100 in centimeters per cc of solid for any material ground to 80% passing 100 microns with an exposure ratio Er is found from: Cr100 = log + 0.77/0.0125 Since joules per gram equals 3.97 times kWh/ short ton, the crack energy Ce in joules per centimeter is found from: Ce = 3.97 Wi100 Sg/Cr100. where Sg is the specific gravity. Combining Eq. and Eq. gives the following equation for calculating the crack energy in joules per centimeter directly from the standard work index and product exposure ratio: Ce = .0496 Wi100 Sg/log + 0.77. From Eq. and Table I, the ores tested have an average crack energy of 4.0 joules per centimeter. Since the work input varies as the crack length, or as the square root of the surface area, surface areas should not be used in computing the work required for...
Grindability as indicated by the bond ball mill work index ranged from 1035 kWh/t, with the majority between 15 and 27 kWh/t. No clear relationships in terms A*b and/or BWi was identified with geological aspects logged from the drill core such as weathering, lithology, alteration, alteration intensity, veining or combinations of these.
There is also a JKTech Bond Ball Mill Work Index Light. Basically only does the BBMWI to 3 cycles instead of the steady state. Requires less material ie 3kg, costs less even if you do duplicates.