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A conventional ball mill circuit the result an increase in production of approximately 25 percent and a reduction in specific power consumption of about 10 percent compared to a conventional ball mill system semi finish grinding upgrading a ball mill system with an hrp in a semi finish mode is a simple solution and installation is easy.
And full sized hpgr units to allow plant design and throughput forecast on a block by block basis of the mine plan using a new ceet program ceet an acronym for comminution economic evaluation tool is an advanced grinding design and performance predicting tool that uses energy relationships to model the performance of sag ball mill.
B ball size inch if a power loss was in deed occurring in the manner indicated above then given a typical ball size of 65mm 25inch such power loss would only be noticeable in mills with.
Comparison of hpgr ball mill and hpgr stirred mill circuits to the existing agsag mill ball mill circuits by chengtie wang beng university of science and technology beijing 2009 a thesis submitted in partial fulfillment of the requirements for the degree of master of applied science in.
Comparison of open and closed circuit hpgr within this study effect of open and closed circuit hpgr applications on dry grinding circuit performance was examined for this purpose sampling studies around three different cement grinding circuit were completed in the first study a circuit including open circuit hpgr ball mill and air separator was sampled and chosen as the basic condition.
For example the sag mill may have 10 mw of power draw available and the two ball mills each of 75 mw of power draw available for a total of ratio of 1015 115 the software uses the particular power model bondbarratt morrell mi etc to determine what is the transfer size where the ratio of e sag to e ball matches the ratio of mill.
High pressure grinding rolls hpgr are becoming an increasingly popular energy efficient solution for comminution of hard rock ores a significant barrier to the increased adaptation of hpgrs is the current requirement for large amounts of sample for pilot testing the primary objective of the research was to develop a dem based computer model for an hpgr to analyze the particle behavior in.
High pressure grinding rolls hpgr ball mills stirred media mills eg isamill or vertical stirred mills stress type and stress rate are based upon the respective machine type tests require several tens to hundreds of kilograms and are done in batch or continuous mode.
Hpgr have been used for many years and are emerging as an energyefficient alternative to conventional and agsag comminution circuits one of the interesting features of hpgr is its capability to produce a particle size distribution with a greater than typical amount of fines thus reducing the power requirement for the downstream ball mill.
Hpgr throughput rate up to 2000 th ball mill wi before hpgr 914 kwht the los colorados huasco pellet plant reported lower energy consumption in wet ball milling as well as reduced circulating load in the mill circuits due to a finer feed and improved bond ball mill work index the existing ball mill capacity could be increased by 30.
the hpgrball mill circuit was estimated to require 75 of the energy of a standard semiautogenous grinding sag mill circuit even with an anticipated greater capital cost the hpgrball mill circuit was found to give significantly better financial returns in all cases investigated in the feasibility study ballantyne et al 2016.
hpgr test results published by grier 1992 on gold ores from the mt todd project showed significant energy savings for a hpgrball mill circuit as compared to a sagball mill plant by adding a polycom highpressure grinding roll the throughput of existing plants can be increased by as much as 150 while simultaneously reducing the power.
original circuit design sagag mills and ball mills huckleberry sabc circuit however very energy intensive and also energy inefficient accounting for 80 of the overall process plant energy depending on the overall process 2 changes to design lead to hpgr and ball mill circuits thus lowering the energy consumption costs slightly 3.
wm wi 80p 10 80f 10 1 where wm is mill specific motor output power kwht wi is the bond ball mill work index kwht p80 is sieve size passing 80 of the mill product m f80 is sieve size passing 80 of the mill feed m the efficiency factors rowland 1975 modify equation 1 so that it caters for circuit.
the ball mill standard grindability test utilises a particular labscale ball mill with dimensions of 305 mm internal diameter and 305 mm length and 20125 kg of steel media with a specified distribution of different sizes.
stronger pellets were produced from the hpgr products with a lower binder requirement ehrentraut and rao 2001 the pellets generally are more uniform in size for example nearly 90 of the pellets were between 80 and 125 mm compared to about 55 in case of the ball mill productstherefore a higher loading on the grate may be possible with the same pressure drop at the.
Microcracks reduce the bond ball mill work index of 1025 when compared with the product from a tertiary cone crusher 2931 32 and that the hpgr is likely to result in weaker coarser.
Mill as such primary ball mills should be designed with the rod mill work index and singlestage ball mills should be with both the rod mill and ball mill indices this is because it is common to observe a difference sometimes significant between the rod mill and ball mill index values for a given ore type mcken verret amp williams 2006 on.
Modelbond hpgr and ball mill hpgr and ball mill circuit this is a highly experimental model use at your own risk the high pressure grinding roll hpgr and ball mill circuit can be thought of as a variation on the classical single stage ball mill ssbm circuit with the final stage of cone crushing replaced by an hpgr.
Modelbond hpgr and ball mill sagmillingcom hpgr and ball mill circuit this is a highly experimental model use at your own risk the high pressure grinding roll hpgr and ball mill circuit can be thought of as a variation on the classical single stage ball mill s circuit with the final stage of cone crushing replaced by an hpgr.
this includes the installation of the hpgr circuit fourth ball mill regrind circuit vertimill additional rougher and cleaner flotation circuits and electrical system upgrades total life of mine expansionary capital including the capital for the 45000 td mill expansion planned for 2021 and the integration of new ingerbelle is estimated.
the calculated specific energy consumptions of the hpgr ball mill and both combined ie overall circuit specific energy are given in table 1 for the rolls in opencircuit and in table 2 for the rolls in closedcircuit with a 5 mm screen and the results for both cases are plotted against specific grinding force in figure 7 table 1 specific.
Our hpgr is a perfect complementary tool to work in conjunction with and even enhance the performance of traditional grinding mills and fixedgap crushers the hpgr exposes feed material to very high pressure for a short amount of time.
Similar results have been seen consistently across all the surveys where this approach has been used including circuits with ag mills pebble mills hpgr stirred mills and ball mills with fine screens figure 2 comparison of the owi and sse75 of the sag and ball mill for 10 surveys conducted on the same circuit at different times.
Than for the hpgr feed wang nadolski et al 2013 the implications for the equipment sizing of the downstream ball mills can be significant patzelt et al 2006 sch nert 1988 estimated that replacing existing circuits with hpgrball mill circuits could increase circuit capacity by 1225 and reduce energy by 1020.
The combination of hpgr and stirred mill in a single flowsheet without tumbling mills has been demonstrated to be technically feasible this research focused on the energy and cost comparisons of the existing agsag ball mill circuits with two proposed comminution circuits including an hpgr ball mill circuit and a novel hpgr stirred mill.
The copper mountain ball mills are 7315 mm 24 feet in diameter and 12040 mm 395 feet long they are overflow discharge ball mills with inside diameters of 7315 mm 24 feet and grinding lengths of 11887 mm 39 feet each ball mill is also driven by two 8500 horsepower abb motors figure 3 the 24 x 395 ball mill learn more.
This contribution presents such a theory of the cataracting motion of grinding bodies in a planetary ball mill an analytical method for the evaluation of trajectories is given which permits an iterative calculation of the time and impact location of the grinding bodies on mill shell or mill filling get price model bond hpgr and ball.
To support the base case the existing circuits were fitted and simulated using a jk simmet model specific energy requirements for the proposed hpgr ball mill circuit and hpgr stirred mill circuit were determined from a pilotscale hpgr and stirred mill test in.