the bond rod mill work index is not as common as the bond ball mill work index, and there are two different variations on the mill apparatus. the sagmilling.com models expect a mill with a wave liner and is not compatible with mills using smooth liners most laboratories outside of australia use the wave liner style of machine these results can safely be used in the models.are the bond work index values divided into a low energy crushing work index for coarse rocks a rod mill work index for intermediate sized particles and a ball mill work index for small particles laboratory
bond ball mill work index may also be used in the simulation and optimisation of existing mills and the associated grinding circuits sample requirements minimum of kg of material crushed to nominally minus mm is preferred jktech would stage crush the sample to minus 335 mm as required for the bond ball mill work index test feed.wibm bond ball mill test work index wic bond impact crushing test work index wioact actual operating bond work index determined from measurements on the circuit wirm bond rod mill test work index wistd standard circuit bond work index used for circuit design. specific energy requirement at
1961). bonds third theory is presented in By rearranging the formula to the operating work index of an existing grinding circuit can be calculated, given known mill power draw, throughput, feed and product size distributions. kwht power applied per ton of feed to the grinding unit Wi the standard bond work index of the orebond ball mill work index is then performed on the mill product for the design of sagball mill circuits this is important because it was found that there was a kwht higher ball mill work index if the mm ball mill test feed size is obtained by sag mill grinding
the bond ball mill work index is one of the most commonly used grindability tests in mining, 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. live chat; bonds work index ball millsbond crushing calculate kaseo heavy machinery. calculating crushing constant using bond law crusher operating work index calculation bond crushing law in ball mill use of the bond work index to size industrial grinding equipment is chats online carbon dioxide carbonic acid equilibrium carbonic acid is formed when the equilibrium expression is the henrys law equation thus get more
In this regard calculation of work index of limestone made by standard bond grindability test. ball mill was employed to conduct the grinding test of seven different samples. among all seven samples collected from the different faces of quarry, bond work index of limestone faca results less than wht, remaining samples are marked as hardchapter 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
oct 19, 2017 the grinding balls diameter determined by the bond formula has a recommendatory character and serves as a starting point for calculating the necessary proportion grinding media feeding a new mill. more precisely adjust the ball load in the mill can only by industrial test performing.net mill power demand, kw. bonds work index may be estimated directly from operational data from back-calculation of the first equation above. In such case is denoted as the operational work index wio data input
dec 04, 2020 the laboratory procedure for running a bond ball mill work index test requires that the operator choose a closing screen sieve size. the instruction is to choose a sieve size that results in the this study aims to develop a new approach toward estimating the bond ball mill work index by applying a series of kinetic grinding tests with bond standard mill. the bond work index, Wi
bond ball mill work index may also be used in the simulation and optimisation of existing mills and the associated grinding circuits sample requirements a minimum of kg of material crushed to nominally minus mm is preferred jktech would stage crush the sample to minus 335 mm as required for the bond ball mill work index test feed.micrometers in size. according to the bond standard procedure, the work index is determined by simulating a dry grinding in a closed circuit in the bond ball mill to achieve 250% circulating load the test is performed on a raw material approximately weighing kg, which coarseness is 100% -3.327 mm.
figure bond ball mill work index unconfined compressive strength 100 200 300 400 ucs wibm figure displays the plot of ball mill work index versus ucs. still no relationship is observed.bond test wis rod mill: ball mill: 9.5 kwht.8 kwht bond standard circuit work index: assume the rod mill work index of 9.5 applies from the actual rod mill feed sizeof 19,300 to a rod
systematic investigation was carried out to predict bonds work index using simple field measurable properties of rocks. tests were conducted on basalt, slate and granite using a laboratory scale ball mill and rock properties namely density, protodyakonovs strength index the bond ball mill work index is one of the most commonly used grindability tests in mining, 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.
3411, h.p. road, moosapet, hyderabad telangana, india. 8464, 700, 701. email protectedthe bonds ball-mill work index is a measure of the resistance of the material to grinding in a ball mill. this index is widely used in the industry for comparing the resistance of different materials to ball milling, for estimating the energy required for grinding and for ball mill scale-up.
the reason for this variation in ball mill work index is because the ore at mt. milligan has an intrinsic exponent of 0.45 in the 100 to 200 size range, not the 0.50 exponent empirically measured by bond. the work index increase between 100 and is due to a porphyritic grain size that causes a spike in energythe 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 alter the ball mill work index of the material
the FC bond work index test ball mill was designed by bond for use in determining the bond index, a measure of grindability and power required for grinding applications. the FC bond mills are used in laboratories throughout the world. copy of fred bonds method of crushing and grinding for determination of the bond index is included with each mill.the grinding jar for the bond index rod mill is in size and has a wave-shaped design. At least to kg sample material is required to simulate a closed grinding circuit in a ball or rod mill. the rod mill work index is used for particle size determination in a size range from mm down to 2.1 mm whereas ball mill work
similar to a comparative work index, this test is an open circuit dry batch grindability test run in the standard bond ball mill for a set time. It can be used at mesh sizes from to 200 mesh the test requires calibration against the standard bond ball mill work index test to estimate the work index.oct 15, 2015 bond work index & hardgrove grindability index tests for biomass & coal. bwi can predict the potential for mill choking of biomass in a tube and ball mill. hgi is a poor method of predicting grindability of biomass in vertical spindle mills. pellets should be composed of pre-densified particles close to the target size.
determination of the bond work index on samplesof nondetermination of the bond work index on samplesof nonthebond work index wi is defined in abond ball millon the samples of standard size 3327 mm in practice it is possible to find materials of nonstandard size that are finer than bond work index ball mill manufactuer in gujaratbond work index an overview sciencedirect topics. ball mill design requires a bond work index, bwi, for ball mills at the correct passing size; sag mill design requires an appropriate sag test, for example, spi flotation design needs a valid measure of kinetics for each sample, including the maximum attainable recovery and rate constants for each mineral
ball mill wio, bwio 8.6 circuit wio, owio 14.6 bond ball mill work index, bwi, kwht 13.4 bond rod mill work index, rwi, kwht 18.1 table example of agsag ball mill circuit wio calculations abstract optimum use of power in grinding, both in terms of grinding efficiency and use of installed capital, can have a large effect on