Modelling the specific grinding energy and ball-mill scaleup ball-mill scale up bonds lawdata zbond work index w i zfeed d f and product d size both 80 cumulative passing result the specific grinding energy w mill power draw p wt, where t the mill capacity mill dimensions from tables or charts.
An understanding of the performance of the rod mill with respect to the properties of the petcoke bond work index, bwi,2 feed inlet rate and inlet size is important too as these properties may change along with a change in crude slate processed in the refinery see figure 2.Performance evaluation of the rod mill the macro parameter to.
Rod mills generate small amounts of fines, as fine particles typically accumulate in the space between rods without enduring comminution 2.Effective grinding of this material occurs in the ball mill compartment, generating finer fragmentation.The bond rod mill work index brmwi test was only possible for blend 5 table 2 due to excessive.
Wirm the bond rod mill work index determination, metric units.The rod mill work index table includes results from laboratories whose apparatus does not conform to bonds original specification.The most significant deviation is several laboratories in australia use a mill without a wave liner the liner specified by bond.
Numerically, the work index is the energy required in kwht to reduce a given material from theoretically infinite feed size to 80 passing 100 microns.The work index of a particular material is determined in the laboratory by conducting the standard bond grindability test.Bond developed separate tests for the rod mill and the ball mill.
Simulating the bond rod mill grindability test simulating the bond rod mill grindability test tavares, lus marcelo de carvalho, rodrigo m.Guerrero, juan carlos 000000 graphical abstract a procedure based on the simulation of batch grinding allowed predicting the bond rod mill work index of ores within no more than 10 of deviation in comparison to the measured value.
Bondbarratt specific energy consumption sabc model.This is a sag or ag mill plus ball mill model that estimates the overall circuit specific energy consumption using the classical bond work index equation for multi-stage crushing and single-stage ball milling e ssbm including rowland efficiency factors.The circuit e total is equal to the e ssbm plus an inefficiency factor cf related to.
The bond ball mill grindability test is run in a laboratory until a circulating load of 250 is developed.It provides the bond ball mill work index which expresses the resistance of material to.
Bond rod mill work index bond crushing low-energy impact work index formulae.Rowland, 2006.Where cf is an optional calibration factor, use 1.0 for normal situations.The rod mill oversize feed factor ef 4 rm is calculated using the greater of the samples rod mill or crushing work index which is usually the wi rm.
Bond ball mill index nandihills net schmierleitung.De.Bond ball mill index nandihills net.Bond rod mill grindability test the test determines the bond rod mill work index which is used with bonds third theory of comminution to calculate net power requirements when sizing ball mills various correction factors may have to be applied the test is a closedcircuit dry grindability test.
The bond rod work index test determines the resistance of ore to grinding in a rod mill, expressed as a work index kilo watt hour per ton kwht.The work index is then used to calculate the specific energy requirements for sizing rod mills or determining their throughput for a.
Generally, bond work index is a common method for selecting comminution equipment as well as estimation of grinding efficiency and calculating required power.In the current research, a simple, fast and accurate procedure is introduced to find the rod-mill work index based on the conventional bond work.
The bond rod mill grindability test is a widely used tool to estimate the response of ores to rod milling.However, the mass of ore required to conduct the test, which can typically vary from.
Generally, bond work index is a common method for selecting comminution equipment as well as estimation of grinding efficiency and calculating required power.In the current research, a simple, fast and accurate procedure is introduced to find the.
Bauxite ball mill work vanadium rodbauxite ball mill work vanadium rod greencraft.Inrod mill experiment with an assumed breakage function.Thirty-.Kinetics of wet grinding in a ball mill.
Mills operate in.In spite of the empirical basis of bonds theory, it is the most widely used method for the sizing of ballrod mills and has become more likely a standard.The general form of bonds equation is as follows 6 where w is the work input kwht wi is the work index kwht which expresses the resistance of the material to.
No 1 rod millball mill circuit was operating very ef ciently when comparing the combined operating work indices for both mills with the rod mill and ball mill laboratory work indices.Note, in figure.1, that the rod mill product slope is less than 0.5 due to an extra amount of.
A 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 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.
Comparison of ucs to bond work indices alex doll, alex g doll consulting ltd, edmonton, canada derek barratt, djb consultants inc, north vancouver, canada ken wood, fluor mining minerals, vancouver, canada abstract unconfined compressive strength ucs is a commonly used rockmass strength measurement used by.
Bond rod mill grindability test.The test determines the bond rod mill work index which is used with bonds third theory of comminution to calculate net power requirements when sizing ball mills.Various correction factors may have to be applied.The test is a closed-circuit dry grindability test performed in a standard rod mill.
Jktech laboratory services bond rod mill index test brmwi a bond rod mill index test brmwi is a standard test for determining the rod mill work index of a sample of ore.The brmwi is a measure of the resistance of the material to crushing and grinding.It can be used to determine.
Copyright© 2020 DRiveOn machinery.All rights reserved. Sitemap