throughput, grinding mill design (by Outotec if their mills are purchased) is available. New grinding mill design for final engineering will be represented by the test work done on the Climax Molybdenum Project for Phelps Dodge (now FMI) in Colorado, USA. The SAG mill and ball mill for Climax are now in fabrication with project start up in late ...
WhatsApp: +86 18838072829The Cadia deposit is a mills of unproven design {40 ft x 20 ft ( m x m) large, homogeneous, low grade, porphyrytype gold SAG mill and 22 ft x ft ( m x m) ball mills}. copper resource.
WhatsApp: +86 18838072829Common convention generally refers to highaspect ratio mills as SAG mills (with diameter to effective grinding length ratios of 3:1 to 1:1), lowaspect ratio mills (generally, a mill with a significantly longer length than diameter) are also worth noting.
WhatsApp: +86 18838072829A grinding mill model based on discrete element method (DEM) simulations is being developed at Outotec Oyj (Finland) to be used in mill design optimization. The model can be used for many purposes; one example is the selection of the lining and the size of the mill to meet the requirements of the clients. To validate the accuracy of the DEM ...
WhatsApp: +86 18838072829hemisphere. It employs the world's largest SAG mill, 40 ft diameter and two 22 ft ball mills in the grinding circuit. In that project, the owners considered it necessary to assess the dynamic response of the foundations for the SAG and ball mills due to vibration problems experienced in other installations. Numerical models of the foundations
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WhatsApp: +86 18838072829which time operating and design experience for SAG mill accumulated. Con ... Secondary ball mill, 18x27 ac synchronized motor coupled to a gear mill, million ... duction criteria, the cost of one day of downtime wascalculatedto be769,500. Production criteria: Rate: kt/d (22,500 stpd) ...
WhatsApp: +86 18838072829Combining this design criteria with the pinion/gear efficiency (use for a synchronous motor, pinion and gear; use for gearless) provides the following equation to estimate the motor size for a geardriven SAG mill: Total SAG Motor Power = (ESAG × tonnes/hour) ÷ ÷ (9) The ball mill motor can be sized using a similar ...
WhatsApp: +86 18838072829One approach has been to change the test from lockedcycle to a pure singlepass batch test in order to minimize the time, effort and sample amount needed, by developing new test mills,, Outokumpu's Mergan mill or the new size ball mill( NSBM), or by modifying the test procedure, such as by changing the test to wet grinding, or by ...
WhatsApp: +86 18838072829Rod mills: Although rarely used in industrial practice, ALS has 2 x kW rod mills for small (<50 kg/h) throughputs where preferential coarse grinding is advantageous for the downstream processing. Ball mills: Ball mills are the stalwart unit of the majority of pilot grinding circuits. ALS has a range of rubber lined overflow ball mills ...
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WhatsApp: +86 18838072829Greenfield design of an AG/SAGball mill circuit with JKSimMet, the additional power requirement in the ball mill(s) is determined with the Bond ball mill work index and the phantom cyclone technique. COMMINUTION Trusted Bench Scale and Pilot Scale Comminution Expertise Across Canada. We offer two indepth simulation options ...
WhatsApp: +86 18838072829SAG mill. SAG is an acronym for semiautogenous grinding. SAG mills are autogenous mills that also use grinding balls like a ball mill. A SAG mill is usually a primary or first stage grinder. SAG mills use a ball charge of 8 to 21%. The largest SAG mill is 42' () in diameter, powered by a 28 MW (38,000 HP) motor.
WhatsApp: +86 18838072829The SAG mill was sized with 746 kW to give a 25% contingency for power swings on the calculated power. The ball mill was sized at 1120 kW. Total installed power for comminution exceeded that required for conventional grinding by a factor of (including secondary crushing).
WhatsApp: +86 18838072829Some design methods (Lane et al., 2013, Morrell, 2004, Siddall Putland, 2007 predict the total comminution energy requirements of SAG millbased circuits using work indices measured in ...
WhatsApp: +86 18838072829> Learning curve start with very low ball charge and build up over time. Do not let the mill charge run down > Soft oxide ore low charge high risk of liner damage can be catastrophic > First set of liners should take ore into account conservative design > Low feed rates only with low ball charges use mill trajectory modelling
WhatsApp: +86 18838072829Even though this was successful, using primary mills to make feed for ball mills was found to be more efficient. Studies showed that these new technologies could replace cone crushing and rod milling to prepare ball mills feeds. By installing primary SAG mills, considerable saving in capital and operating costs were realized (Wills and Finch ...
WhatsApp: +86 18838072829semiautogenous grinding (SAG) mills and is the fourth paper in a series of five papers on Inferential Measurement of SAG Mill Parameters. The development of the inferential measurement models of SAG mill discharge and feed streams and mill rock and ball charge levels, detailed earlier in the series, is summarised.
WhatsApp: +86 18838072829The design of rod and ball mills is still carried out with the Bond ball mill and rod mill grindability tests. As discussed earlier in this paper, it is important in this case to match the reduction size of the test to that desired from the industrial mill. As such, primary ball mills should be designed with the rod mill work
WhatsApp: +86 18838072829AG/SAG mill based circuits and this has impacted on the ability of companies to obtain funding. Bailey et al. (2009) published guidelines on the use of typical SAG millbased circuit design methods, with particular focus on the use (and misuse) of JKSimMet. A follow up paper by Lane et al. in
WhatsApp: +86 18838072829Paper describes a "sick" SAG mill and the changes made to "bring it to health". The "healthy" mill conditions benchmark as follows: Actual SAG/ball motor powers (at shell): 3,168 kW / 4,105 kW; Actual daily average throughput: 500 tonnes/hour; Predicted SAG/ball motor powers (at shell): 3,096 kW / 4,182 kW
WhatsApp: +86 18838072829Assuming your ore is AGamenable: 7 TPH to 15 TPH is a comfortably production average for a 13′ x ′ AG Mill. A 13′ x 6′ SAG Mill has a reasonable range of: 20 to 30 TPH for gold ore SAG Ball Mill duty. 25 to 40 t/h for copper porphyry SAG Ball Mill duty. In Single Stage SAG duty, the approximate capacity reduces to only 8 to 13 ...
WhatsApp: +86 18838072829Therefore, SAG mills are favored by large mines and are becoming more and more widely used in the mineral processing industry [1,2]. A SAG mill has low speed and heavy load, which cause the energy consumption of grinding operation to be very high. It accounts for a large proportion of the electrical consumption across the plant .
WhatsApp: +86 18838072829Which criteria take precedence will have a major influence in the final grinding circuit choice. ... by innovative design of the modified foundations disruption to the existing operation was kept to an absolute minimum during the decommissioning of the old mills and installation and ... An extension of the previous circuit is the SAG/Ball Mill ...
WhatsApp: +86 18838072829SAG mills use a combination of steel balls and rock particles as grinding media, while AG mills use only the ore itself. Both types of mills are used for grinding ore in mineral processing operations, but SAG mills are larger in size and can grind larger quantities of ore. AG mills, on the other hand, are smaller and are typically used for ...
WhatsApp: +86 18838072829Project Director at Chengde Rongmao Cast Steel Co.,LtdChina Grinding Balls, Grinding Media, Ball/SAG Mill Liner Factory Published Nov 1, 2017 + Follow
WhatsApp: +86 18838072829Manual design of SAG/ball/rod mill foundations. · Have personally never been invovled with the design of a SAG Mill foundation, but have done a number of rotler, balancer, very large CNC Mills As an engineer who has experience using FEM for the design and assessment of SAG and ball mill foundations, I know that this approach can be ...
WhatsApp: +86 18838072829SAG mill design, GMD design and the associated component manufacturing. them in the test data by using aswelded specimen which satisfies visual Mill Foundations Design Criteria,720· A design criteria for pole foundations is indicated in Section 1804 and Paragraph of the 2006 International Building Code.
WhatsApp: +86 18838072829Bailey et al. (2009) published guidelines on the use of typical SAG millbased circuit design methods, with particular focus on the use (and misuse) of JKSimMet. A follow up paper by Lane in et al.
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