stage SAG milling is likely to be a comparatively profitable grinding circuit design xMedium Grind 80 passing size between 106 and 75 m To mill in single stage SAG configuration the feed must be consistent and the downstream process reasonably capable of
Sag grinding and bond ball mill work index bwi for ball mill grinding a further measure the minnovex crusher index ci was also measured for use in the ceet program to determine sag mill feed size kosick and bennett 2001 grinding circuit design for adanac moly
The mills can be operated in open circuit feeding downstream secondary grinding or operated in closed circuit as single stage mills generating a finer product size single stage sag mills are very beneficial in reducing capex for plants with a staged throughput approach
Design sagball mill grinding circuits this new method was developed to allow design engineers to create meaningful grinding circuit designs early in the project development cycle at or before the feasibility study stage so that any problems or uncertainties could
Initially faced with a blend of primary and oxide ore the circuit achieved in excess of 320tph until the oxide was depleted leaving only the much harder primary feed the 20mw semiautogenous grinding sag mill and 37mw ball mill was assisted by a 150kw pebble crusher but the power limitation of the sag mill resulted in a drop in throughput
Nov 26 2019 sag mill is usually used to grind large pieces into small pieces especially for the preprocessing of grinding circuits thus also known as primary stage grinding machine based on the high throughput and coarse grind ag mills produce coarse grinds often classify mill
S mill grinding circuit design 911metallurgist semi autogenous design factorssag mill operation exampleprocess plant descriptionsag mill design and specificationoperating problems since commissioningdesign changes and future operating strategies the design of large mills has become increasingly more complicated as the size has increased and there is little doubt that without
Autogenous ag and semiautogenous sag mills now dominate circuit design in gold and base metals applications and can rightfully lay claim to being conventional leaving technologies such as high pressure grinding rolls the title of new regardless of how one categorises these technologies today a much wider spectrum of proven
Following a successful commissioning and startup we believe that two grinding lines at las bambas per each consisting of one sag mill and one ball mill this mill combination is uniquely specific to las bambas ore types are operating at design throughput of close to 140000 tpd and within the range predicted by djb from a managed multisample geometallurgical testing program ie no
Comminution circuit design and simulation for the development of a novel high pressure being more energyefficient than grinding mills not requiring steel grinding media and providing higher throughputs than cone crushers 3 guidelines for energy requirement comparisons between hpgr and sag mill circuits in hightonnage hard rock
Grinding circuit design principles for semiautogenous grinding sag mills there are two basic forms of testing single particle breakage and tumbling tests designed to recreate the actual mill environment for high pressure grinding rolls and regrind mill sizing a specific test designed for that piece of equipment is best
Agsag mill is inefficient in grinding particles of a certain size typically in the range of 2555 mm ie pebbles therefore cone crushers are often used as pebble crushers and integrated into agsag mill circuits to break the critical size particles that accumulate in the mill and to increase the performance of the primary grinding circuits
During the survey for a period of two hours to ensure sag mill circuit stead y state kinetic model has been mostly used to the design of grinding circuitsin this study the relationship
The grinding circuit optimization application is the first technology to accurately predict critical sag mill performance variables it then correlates this data to give an accurate picture of conditions inside the mill this allows mines to reduce downtime in operations by reducing scheduled liner wear inspections and unnecessary changes
The intellisenseio grinding circuit optimization application has been piloted at the aktogay plant of jsc ak altynalmas a digital twin of the sag mill was created which enables improved monitoring performance prediction and optimization to increase profitability
Sag mill discharge screenstrommel vs vibrating tony moon rtz what id like to talk about is probably one of the nastiest bits of mill design for a grinding circuit and that is the choice of what do you use on a sag mill discharge do you use grinding lines used both types of screens and on line two we used only a trommel
Sag mill grinding circuit design sag mill itself and not on the test work program stated another way money invested in a large sag mill is an investment that can produce handsome returns if extra production is needed or simply to give the mine the option to mill the hardest ores at design throughput rates
Grinding circuit design tools including for sag millball mill circuits and geometallurgy energy models are available to subscribers the online library of technical articles contain several papers on metallurgical topics including comminution modelling mass balance calculations and laboratory comminution testwork program information
Sag mill grinding circuit design bailey et al 2009 published guidelines on the use of typical sag millbased circuit design the energy intensive blasting and resultant size distribution of the pilot plant feed poor understanding of scaleup factors from 6 foot diameter pilot
Every mining operation has a unique grinding process minevik has experience of over 8000 grinding mills globally including manufacturing and delivering the largest sagag mills in the world our experts welcome the opportunity to assist you with circuit and circuit control design as well as startup operation and optimization of your mill
Grinding mill process design choosing an appropriate grinding circuit configuration depends on your ore characteristics and mine plan outotec has extensive knowledge of comminution technologies and processes to ensure we provide the optimal solution for your needs ag semiautogenous sag ball rod and pebble mills in sizes ranging
The inclusion of a recycle crusher to a single stage ag or sag circuit to prevent over grinding this inclusion may not always be required if the followed by a closed circuit ball mill ss sag primary crushing followed by a single stage sag mill capital cost circuit design is
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
Comminution consultants grinding circuit designdjb following a successful commissioning and startup we believe that two grinding lines at las bambas per each consisting of one sag mill and one ball mill this mill combination is uniquely specific to las bambas ore types are operating at design throughput of close to 140000 tpd and within the range predicted by djb from a managed
The spi test in combination with bond ball mill data are used in the advanced comminution economic evaluation tool ceet grinding simulation system for design optimization and production forecasting studies the spi has the advantage of requiring a low sample weight and is therefore well suited for geometallurgical mapping of ore deposits
During the study in early 2005 the circuit throughput was set at 9 mtpa and the key grinding circuit design parameters were as shown in table 1 table 1 initial grinding circuit key design parameters sag mill feed size f100 235mm feed size f80 115mm ore sg 29 required mill discharge size p80 2000 micron ball charge 10 to 18 total charge 26
While the two sag mills at mt keith are identical in design their operation is not due tosegregation of the coarse and fine material in the stockpile that provides feed to the grinding circuit therefore the two circuits operate under different conditions and this has always presented a challenge for maximising throughput and optimising grind
Agsag 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
Grinding circuit design agsag milling can be accomplished with a variety of flowsheets the optimum flowsheet should be established during the testing of the ore also called semiautogenous grinding mill or sag mill is mainly used to grind ores and other particulate matter in different fields like chemical industry mining field
Pilot and full size agisag mill grinding circuits as well as develop ing a number of ore characterisation tests with which to develop and validate its mathematical models this paper describes some of the developments in the agisag model together with some ex amples of its use with particular reference to the design of green field circuits
Sag mill grinding circuit design 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 128m in diameter powered by a 28 mw 38000 hp motor