Use the Morrell SMC SABC models if you have SMC Mi test results Mia and Mib. For a SAG mill circuit singlestage flowsheet type OCSAG or SSSAG Use the BondBarratt singlestage SAG model if you have Bond work index test results requires ball mill work index, rod mill work index and impact crushing work index. Use the Morrell SMC single
proposed circuit consists of a SAG mill 40 feet in diameter and 25 feet in length EGL, with an installed gearless motor of 24 MW and two 28 feet diameter by 44.5 feet in length ball mills equipped with 22 MW gearless motors. The circuit would operate in SABCB configuration with two pebble crushers equipped with at least 750 kW motors.
THE MODELLING OF SCRUBBERS AND AG MILLS, WHEN TO USE THEM DESIGN OF AGSAG MILL CIRCUITS USING THE SMC TEST. SAG and ball mill circuits are used to show that Bonds equation does not
Predicted Comminution Circuit Specific Energy Using The SMC Test Compared to Values Measured from Over 120 Operating Plants from Around the World. ABOUT THE SMC TEST. The SMC Test is a laboratory comminution test which provides a range of information on the breakage characteristics of rock samples for use in the miningminerals processing industry.
A typical SAGHPGRBall mill circuit suggested by Patzelt et al. 6 is shown in Figure 9.6, where the pebbles from the SAG mill are crushed in the highpressure grinding rolls. It is a general observation that SAG mills are helpful for grinding where wide variations in the grindability of ores are experienced.
Morrell, S, 2006. Design of AGSAG mill circuits using the SMC test, in. 2007 with his paper The effect of aspect ratio on the grinding efficiency of open and closedcircuit AGSAG mills
mill work index 11.4 kWht and an average RQD of 44. RQD values of 25 resulted in a SAG mill feed size F80 between 55 and 60 mm and throughputs of 6200 th. RQD values of 55 resulted in SAG mill feed size F80 of over 70 mm and a SAG mill throughput of 5200 th. The Batu Hijau SAG mill specific energy was a function of point load test and
The SAG Power Index SPI test Starkey Dobby, 1996 uses a benchscale SAG mill test to determine the specific energy of an industrial SAG mill. The test is operated in closed circuit and the time required to grind the material to a P 80 of 1.7 mm is used to predict AGSAG specific energy using
For HPGR circuits, testing has been dominated by machinespecific tests. However, a derivative of the dropweight test, the SAG Mill Comminution SMC test, has been adapted to not only develop parameters for the widely used JKSimMet software but also provide machinespecific parameters, as well as calculating a dropweight index DW i.
Use the Morrell SMC SABC models if you have SMC Mi test results Mia and Mib. For a SAG mill circuit singlestage flowsheet type OCSAG or SSSAG Use the BondBarratt singlestage SAG model if you have Bond work index test results requires ball mill work index, rod mill work index and impact crushing work index. Use the Morrell SMC single
ization data generated from the SMC Test see Annex A and the Bond Ball Mill Test Work Index WiBM GMG, 2016a, and the Morrell equations and their application see Annex B. A worked example is provided in Annex C. 5. SCOPE The Morrell method can be used to predict the specific energy of comminution circuits, where such circuits include
By combining with SAG discharge and screening on the SAG discharge screens, top size control to the ballmill circuit feed is maintained while still unloading the SAG circuit Mosher et al, 2006. A variant of this method is to direct pebblecrushing circuit product to the ballmill sump for secondary milling while convenient, this has the
2 AG mill a recycle crusher Competent ore relatively homogenous the recycle crusher is used to balance the rate of impact breakage within the circuit 3 SAG mill 8 15 ball charge Variable competency ore 4 High ball charge SAG mill 15 to 25 ball charge Incompetent ore 5 Low ball charge SAG mill, high mill speed.
the Bond Rod Mill Work Index and the SMC test. When Millpower 2000 using WiRM and JK SimMet using Ab were run headtohead on this project, the circuit throughput projections were within 5. The same headtohead comparison of the project shown in Figure 8 showed a 20 to
If the crusher is in open circuit, e.g., pebble crusher in a AGSAG circuit, K 2 takes the value of 1.19. x 1 P 80 in m of the circuit feed. x 2 P 80 in m of the circuit product. M ic Crushing ore work index and is provided directly by SMC Test . 2.2.3. HPGR. Eq. for HPGRs is written as 8 W h K 3 M ih 4 x 2 f x 2x 1 f x 1
For design purposes, you need an estimation or prediction of your SAG Mills tonnage well, there are 3 ways to generate good rock ore hardness testing data for SAG and ball mill circuit grindability from half drill core. We can abbreviate the discussion by saying there are three religions of grinding, and there are smallscale tests suitable for all three of the major religions
design commercial grinding plants. The MacPherson Autogenous Grindability test is performed with a light ball charge 8, so it is actually a SAG mill test, but the results from the test have been used for the analysis of both fullyautogenous FAG and semiautogenous SAG circuits the fine feed size to the mill
SGSs comminution experts use the SAG Mill Comminution SMC test to characterize ore samples, an important first step to grinding circuit design, optimization and production forecasting. The SMC test is an abbreviated, less expensive version of the JK Dropweight test.
SMC to determine the variability within that rock type. Although the SMC test is performed using the same test equipment as the DWT and produces anA and b parameter value, it is intended as a lowcost impact hardness mapping testing. There is no abrasion test associated with the SMC test and it is performed on one size only. The DWT is a better
The SMC Test a costeffective means to predict comminution circuit throughput, rock mass characteristics and blasting properties. The SMC Test was developed by Dr Steve Morrell of SMC Testing as a costeffective means of profiling an ore body to predict its comminution circuit throughput as well as its rock mass characteristics and blasting properties.
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SAGDesign Testing. The flagship SAGDesign test is the most accurate grindability test available. The SAGDesign test measures the pinion energy to grind ore from 80 passing 152 mm to 80 passing 1.7 mm W SDT.. The 2 nd stage of the test measures the Bond Ball Mill Work Index on SAG ground ore, S ore feed is prepared from a minimum of 10 kg of split or whole diamond drill
SAG Mill Design Test Starkey, 2006. There are reasonable correlations between all the tests data that generally allow any or all of the data to be used to design a SAG mill based grinding circuit for typical ores of a moderate competence range. Issues have arisen where the expected SAG mill specific energy is greater than 10 kWht.
Morrell, S. Design of AGSAG mill circuits using the SMC test. International Autogenous and SemiAutogenous Grinding Technology. Vancouver, Canada 2006a Google Scholar. 35. Morrell, S. Rock characterisation for high pressure grinding rolls circuit design.
Predicting the Overall Specific Energy Requirements of AGSAG, Ball Mill and HPGR Circuits on the Basis of SmallScale Laboratory Ore Characterisation Tests Conference Paper Fulltext available
SMC Test comminution benchmark hits new milestone Posted by Daniel Gleeson on 27th April 2020 This month, the Australiainvented SMC Test, used by leading mining companies over the globe to improve concentrator performance, optimise throughput, and decrease energy use, reached its 50,000th test.
geometallurgy and multiscenario simulation in the design of a circuit featuring AGSAG mills. The method relies in using statistics to analyze geometallurgical and mining data to model the variability of specific energy requirements of SAB SAG and ball mill and SABC SAG and ball mill withpebble crushing circuits for mill design purposes
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