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The second stage of the SAGDesign test measures the Bond ball mill work index on SAG ground ore that has been crushed to 100 passing 3.35 mm. The ball mill work index is determined from Bond8217s Third Theory of Comminution.
Free quote Send messageThe SAG mill pinion energy, WSDTkWht and SAG discharge Bond ball mill work index, Sd-BWI kWht, are then used to calculate the total energy to grind the ore from 80 passing 152 mm to 80 passing the client specified final product size P80. This information, along with the ore specific gravity, is used to calculate necessary mill sizes and motor power in industrial applications. SAGDesign testing implements first principle technologies developed by Fred C. Bond to design grinding circuits.
Typically, Starkey amp Associates recommends SAG mill circuits followed by a ball mills working in series with the SAG mill. The quantity of mills or pebble crushers recommended is dependent upon the ore hardness, design plant throughput, and final product size desired for ideal liberation.
SAGDesgin testing is also used in benchmarking projects where a total energy predicted by the test is compared to the actual power draw observed in the plant. Historically, the accuracy of the tests is within - 10. SampA8217s paperpresented at Gecemins Procemin 2012 conference in Santiago, Chile, gives more information on this matter.
Starkey amp Associates employees review all SAGDesign andvariability grindingtests done in every laboratory to ensure that the quality and accuracy of the work done meets quality control standards. SampAprovides the SAGDesign test procedures and oversees the test work results for every commercial laboratory offering SAGDesign testing services.
Eight of the ten SAGDesign laboratories were benchmarked for accuracy of the SAGDesign test in late 2011. WSDT results were within - 5 of the average while Bond BWi results for the same tests were within - 10 of the average BWi for all eight labs. More information on this study can be found here.
Grinding mill process design. SAG, ball, rod, and pebble mills in sizes ranging from kWs up to 30 MW. Our product range also includes a number of unique solutions, including the worlds largest acid-resistant grinding mills, which can operate with extremely corrosive slurry.
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However, it is not feasible to perform a comprehensive experimental design, especially when the mill is in constant operation. Discrete element method DEM simulations, which are based on first principle physics, have proven very helpful in such cases by enabling increased process insight and evaluation of a large number of possible solutions. Using a commercial DEM software like Rocky, an engineering team can easily evaluate changing process variables, such as speed and fill level, or a new lifter design that incorporates changed face angle and height with a high degree of accuracy.
Todays presentation will highlight how Rocky DEM software combined with ANSYS CFD as needed for fluidised systems can help engineers to predict liner wear and fine-tune their design to obtain optimum conditions for SAG mill operation. Contact LEAP today if you have questions on how DEM modelling can help with your process or system.
Operating principle Scanning Initially, the mill is scanned using a state-of-the-art laser scanner either by personnel entering the mill or remotely, by mounting the scanner on a support beam. Scanning is performed in as little as 15 minutes and can be scheduled to.
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Oct 22, 2012nbsp018332scenario the performance optimization of typically large SAG MillBall Mills plants has become a weighty item to make projects viable. A method to optimize the SAG Mill SME 2009 Impact on Grinding Mill Design and Recent New Discoveries. between SAG and ball mills at the design T80 transfer the ratio of SAG kWht to Bond Ball Mill Wi.
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The even wear allows for the new life potential of media rejected from ported SAG mills. The rejects are totally recyclable since the media retains their integrity for ongoing deployment in a secondary mill. Recycling to a ball mill as supplementary media or possibly as resale to other users provides additional value for our clients.
Remove the ground contents of the mill. In recent years, as SAG mills have grown in size, the process aspects of liner design and their impact on mill performance have become particularly important. Practical experience, the principal source of the observations on liner design made in this review, continues to be critical to good mill liner design.
Mar 21, 2007nbsp018332Similar to the impeller design affecting pump capacity, the pulp lifter design affects the discharge capacity or mill throughput of AG and SAG grinding mills. Generally, the discharge from AGSAG mills consists of one or both of the following components slurry water and finer particles and pebbles 20-100 mm.