the bond abrasion test determines the abrasion index, which is used to determine steel media and liner wear in crushers, rod mills, and ball mills. bond developed the following correlations based on the wear rate in pounds of metal wearkwh of energy used in the comminution process. the bond ball mill work indices determinations gave reasonably reproducible results, significant variation was observed in the measurement of the bond rod mill work index on at least one sample tested, and large variations in abrasion index and crushing work index were due to variations in the test method across the laboratories
outotec mergan method is faster than the bond ball mill test, and requires less sample material. however, the mergan method gives grinding energy consumption, which can be used to calculate mergan work index, but this mergan work index differs from the bond work index. therefore, it is needed to analyze if the mergan work index correlatessimulated test method for bond ball mill work index was used to perform the comminution test. the results showed bwi values vary from 5.67 kwht to 20.21 kwht. examination of the possible correlations between bwi and the geological features showed that the key geological feature related to comminution variability is lithology.
test using ball-race test mill was performed. knowing the hardgrove indices, the bond work indices of some samples were estimated using the aplans formula. the approximate work indices were determined by running a batch dry-grinding test using a laboratory ball mill. finally, the work indices obtained from both methods were compared.2.4.1. bond test 2.4.2. variations of the bond test 2.4.3. evaluation of grindability tests 2.5. pilot and bench-pilot scale tests 2.6. indirect methods for determining comminution behavior 2.7. summary and conclusions linkage between comminution test work and process modeling 3.1.1. size reduction models
method of test for ball penetration in fresh portland cement concrete: jacquelyn wong 205 multiple versions: method of test for water retention efficiency of liquid membrane-forming concrete curing compounds: lisa watson 291 multiple versionsthe ability to simulate the bond work index test also allows examination of truncated ball mill feed size distributions on the work index. for grinding circuits where the feed to a ball mill is sent directly to the classifier and the cyclone underflow feeds the ball mill a question arises as to whether this practice will
sagdesign testing provides sag pinion energy grindability in kwht to within from 152 to 1.7 mm, and bond ball mill work index on sag ground ore, from the sag test on the same sample. starkey & associates uses the patented sagdesign technology to calculate accurate mill sizes from measurements on a clients own ore samples.bond ball mill work index test may be required for the design of a new mineral 2013 high quality ball mill design calculation gold ball mill ball mill liners learn more. work index of attrition ball mill. ball mill bond work index for limestone. gulin machine in iron ore processing plant, ball mill bond work index for limestone
the bond grindability test, the bond work index, and .council the south african institute of mining and metallurgy, 1989. SA tion of the energy consumed by wet grinding in a ball mill of plant mill, and it leads to the statement that one revolufield method for determining in-place density of soils and base materials: tex-116-e: ball mill method for determining the disintegration of flexible base material: tex-117-e: triaxial compression for disturbed soils and base materials: tex-118-e: triaxial compression test for undisturbed soils: tex-120-e: soil-cement testing:
both procedures were conducted using a standard bond test mill. introduction the bond ball work index is widely used in the field of minerals processing as an indicator of ore grindability. the work index is determined by means of a locked-cycle test procedure that typicallybond mill work index. bond ball mill index test bbmwi a bbmwi test is a standard test for determining the ball mill work index of a sample of ore it was developed by fred bond in and modified in the bbmwi is a measure of the resistance of the material to crushing and grinding
jan 01, 2013 To calculate bond rod-mill work indices, the four samples were screened and the particle size distributions plotted in fig. 2.the plot was used to find of the samples for calculations. fig. fig. show the grinding kinetics of pb, cu, fe, and Mn ores in the bond rod-mill in different test-sieves. the slopes of all lines in the figures are equal to the value of eq.apr 01, 2008 methods 4.1. bond ball mill testing. generally bond work index for mill dimensioning and controlling is measured by grinding a feed material of 3.36 mm particle size under standardized conditions in a so-called bond mill
bond index test test conducted on a bond index testing mill of sample milled for 100 revolutions. new number of revolutions is calculated to produce fines equal to 13.5 of the total charge of the mill. the bond work index expresses the resistance of the material toshortcomings, the test was changed to a locked cycle technique as described below. locked cycle tests the preferred test procedure is a locked cycle test akin to the bond ball mill work index determination. the first cycle starts with minus mesh ore removed since it is believed that the fines content can fill most of the voids allowing
In the modbond grindability test, an open circuit dry batch test run is used for estimating the work index after calibration against the standard bond ball mill test 53. grindability index test method & procedure 911 metallurgist. the proposed grindability test uses the bond standard test mill and a quantity the bond work index is determined by a standardized procedure in which the namely one in which wet grinding is done in a ball mill of 2,44 diameter. read more
standard bond ball charge and bond test reference materials these two projects will be carried out concurrently and will provide a source of the standard bond ball mill test ball charge to the industry and generate reference materials that can be used by the industry to bond ball mill index test bbmwi test is a standard test for determining the ball mill work index of a sample of ore. It was developed by fred bond in 1952 and modified in 1961. the bbmwi is a measure of the resistance of the material to crushing and grinding.
chapter size reduction and energy requirement scribd. apr 19, 2010 Wj is known as the bond work index and represents the work 3.3.4 bond ball mill standard test the method for determining thebond ball and rod mill work indices the work index is a measure bond abrasion index this test is used to standard test method for bond index and energy index know more
characterized as sodium feldspar. the hardgrove grindability test used a ball-race test mill. the hardgrove grindability indices of these feldspar samples had an average of 46.25. knowing the average hardgrove index, a calculated work index of 12.88 kwstph bond ball mill grindability test procedure. introductions to grindability in metallurgy sag mill testing test procedures to characterize ore grindability the bond ball mill grindability test is a locked cycle laboratory grinding test. get price comparative bond ball mill work index
here is the old allis-chalmers bond work index grindability test procedure. the standard feed is prepared by stage crushing to all passing a mesh sieve, but finer feed can be used when necessary. It is screen analyzed and packed by shaking in a 1000-cc graduated cylinder, and the weight of 700 cc is placed in the mill and ground dry at 250 per cent circulating load. the mill is in. bonds work index ball mill. bond method for ball mill work index test a bond ball mill work index test is a standard test for determining the ball mill work index of a sample of ore it was developed by fred bond in 1952 and modified in 1961 jkmrc co his index is widely used in the mineral industry for comparing the resistance of different materials to ball milling for estimating the energy required
abstract: the bond work index is a measure of ore resistance to crushing and grinding and is determined using the bond grindability test. its value constitu tes ore characteristic and is used fortwo shortened test procedures for estimating the bond ball work index are compared for suitability of use on zambiandrc-type coppercobalt ores. the first procedure is based on a batch milling test while the second procedure is based on a limited locked-cycle test. both procedures were conducted using a standard bond test mill. introduction
jan 01, 2013 In the standard bond test at 100% circulating load: 100 100 where is an oversize fraction weight is a fresh feed weight and is a mill feed weight