Operation Analysis of a SAG Mill under Different · the fill level ratio and the steel ball ratio on the SAG mill Finally through statistics and analysis of particle information and mill power under di erent conditions we analyzed the influence of three parameters on the particle fracture e ect in the SAG mill and obtained the best operating parameters of the SAG mill 2 Simulation Principle Characteristics Discrete Element Method
Grinding Circuit an overview ScienceDirect SAG mill product feeds two parallel ball mills of m× m internal diameter×length each with a MW twin pinion drive The ball mills are operated at a ball charge volume of 30 32% and % critical speed The SAG mill trommel undersize is combined with the ball mills discharge and pumped to two parallel packs clusters of twelve 660
Optimization and Performance of Grinding Circuits The Semi Autogenous Grinding SAG mill and a ball mill The SAG mill circuit also includes a single deck screen and a cone crusher while the ball mill circuit utilizes hydrocyclones Currently the grinding circuits are inefficient in achieving the aspired product fineness of x P 80 = 125 μm even at low to normal throughputs 450 600 t/h An evaluation and optimization study of the circuit
Austin SAG model History The SAG mill model by proposed by Leonard Austin 1990 was largely based on modifications of earlier tumbling mill models by Hogg Fuerstenau and F Bond The model uses a kinetic potential energy balance to describe the power draw of a mill charge Many geometric components of the earlier models were fit to empirical relationships measured by Austin
ERSEL Ağır Makine San ve Tic A Ş SAG mills are the machines with the highest reduction rate which performs crushing grinding and washing together It offers a much higher reduction ratio than 3 stage crushing and screening system Feeding material in the dimension of 200 300 mm is reduced to d100 2 mm and below This capability increases the efficiency of the ball mill while reducing the circulating load of the system
Autogenous mills semi autogenous mills and ball mills for SAG and ball mill for gold ore grinding One of three SAG mills with m diameter and 2 x 4000 kW drive power These mills operate in conjunction with ball mills for iron ore grinding in Iran Ball mill for grinding lime stone for a flue gas desulphuri sation system in a Korean power station Reagent preparation systems for FGD from limestone handling through to grinding Polysius brings
Model Raw Bond/Barratt SAB SABC Model Raw Bond Model This is a SAG or AG mill plus ball mill model that estimates the specific energy consumption E SAG using the 1979 Barratt equation and the classical Bond work index equation including Rowland efficiency model allows a manual calibration factor on both equations CF SAG and CF ball respectively This formula usually gives higher total circuit specific energy
Frozen charge detection and automatic loosening with Mill in Brazil and Lumwana having a 38ft 18 MW SAG and one 26ft 16 MW Ball Mill in Zambia all three mills put in operation in 2008 as well as Los Bronces Confluencia in Chile equipped with one 40ft SAG Mill of 22 MW and two 26ft Ball Mills of MW commissioned in 2011 In the light of increasing interest in that technology various further Gearless Mill Drives with FCS are presently
Frozen charge detection and automatic loosening with Mill in Brazil and Lumwana having a 38ft 18 MW SAG and one 26ft 16 MW Ball Mill in Zambia all three mills put in operation in 2008 as well as Los Bronces Confluencia in Chile equipped with one 40ft SAG Mill of 22 MW and two 26ft Ball Mills of MW commissioned in 2011 In the light of increasing interest in that technology various further Gearless Mill Drives with FCS are presently
Power based modelling of single stage AG and SAG mill circuitsWiBM is the Bond ball mill work index unitless CFnet is an empirical adjustment to a ball mill circuit [CFnet = × ln P80 ] Morrell Mi model Morrell 2008 published a two parameter model based on two equations 3 4 to describe a variety of comminution devices including single stage SAG and AG mills The CEE
SAG mills Metso OutotecSAG milling extends itself to many applications due to the range of mill sizes available They can accomplish the same size reduction work as two or three stages of crushing and screening a rod mill and some or all of the work done by a ball mill SAG mills are also an optimum solution for wet grinding since crushing and screening in these cases can be difficult if not impossible Efficiency
Advanced Controller for Grinding Mills Results from a upsets such as mill spills and/or power excursions in SAG mills centrifuging in ball mills etc The constant need to adjust plant operation objectives because of frequent problems with equipment upstream such as primary crushers or downstream such as performance of flotation or regrind mills with availability and maintenance of critical sensors such as pulp density particle
SAG Mill Liner China HenginSAG mill liners from Hengin are based on working conditions and mine attributes to carry out structural design material selection casting process design heat treatment process design manufacturing on site tracking and mapping and continuous optimization and adjustment Our mining mill liners serve a wide range of users of iron ore copper ore molybdenum ore gold ore and uranium ore
ERSEL Ağır Makine San ve Tic A Ş SAG mills are the machines with the highest reduction rate which performs crushing grinding and washing together It offers a much higher reduction ratio than 3 stage crushing and screening system Feeding material in the dimension of 200 300 mm is reduced to d100 2 mm and below This capability increases the efficiency of the ball mill while reducing the circulating load of the system
Model Raw Bond/Barratt SAB SABC Model Raw Bond Model This is a SAG or AG mill plus ball mill model that estimates the specific energy consumption E SAG using the 1979 Barratt equation and the classical Bond work index equation including Rowland efficiency model allows a manual calibration factor on both equations CF SAG and CF ball respectively This formula usually gives higher total circuit specific energy
How Ball Mills Work Engineering and Mining · Learn how a ball mill works all of its main parts and some of its design features This 3D animated video allows you to see all the internal parts of a ball
Optimization and Performance of Grinding Circuits The Semi Autogenous Grinding SAG mill and a ball mill The SAG mill circuit also includes a single deck screen and a cone crusher while the ball mill circuit utilizes hydrocyclones Currently the grinding circuits are inefficient in achieving the aspired product fineness of x P 80 = 125 μm even at low to normal throughputs 450 600 t/h An evaluation and optimization study of the circuit
Gearless Mill Drives ABBCapacity SAG Mill 4583 t/h Ball Mills 4583 t/h Consultant Bechtel Chile Mill Builder FFE Minerals USA Mill Size SAG Mill 38 feet/11 58 m Ball Mills 25 feet/7 62 m Ore processed Copper Ore Drive Rating SAG Mill 19 4 MW / 9 31 rpm Ball Mills 13 43 MW / 11 5 rpm Award of Contract November 2000 Start of Operation December 2002 ABB s scope of supply Four complete Gearless Mill Drive
Ball Mill an overview ScienceDirect TopicsThe ball mill accepts the SAG or AG mill product Ball mills give a controlled final grind and produce flotation feed of a uniform size Ball mills tumble iron or steel balls with the ore The balls are initially 5 10 cm diameter but gradually wear away as grinding of the ore proceeds The feed to ball mills dry basis is typically 75 vol % ore and 25% steel The ball mill is operated in
Ball Mills and Sag Mill problem AMP · We have two Ball Mills and one Sag Mill We had some visual inspection on pinion and ring gears during these inspections we found some abnormal wear on this gears pictures show this problem in enclosure After that we decided to do some tests as vibration and oil analysis Result of the vibration and oil analysis tests are as a below Oil analysis this shows amount of silica is very much
Austin SAG model History The SAG mill model by proposed by Leonard Austin 1990 was largely based on modifications of earlier tumbling mill models by Hogg Fuerstenau and F Bond The model uses a kinetic potential energy balance to describe the power draw of a mill charge Many geometric components of the earlier models were fit to empirical relationships measured by Austin
C O N S U L T I N G L T D TECHNICAL MEMORANDUMThe value T80 is the synthetic transfer size between the SAG mill and ball mill a fines corrected 80% passing size2 of the SAG mill product or the combined SAG mill product and crushed pebbles if the circuit is sending crushed pebbles to the ball mill circuit SABC B operation The EF4RM for rod milling is used calculated using Equation 7 1 Barratt An Update On
Advanced Controller for Grinding Mills Results from a upsets such as mill spills and/or power excursions in SAG mills centrifuging in ball mills etc The constant need to adjust plant operation objectives because of frequent problems with equipment upstream such as primary crushers or downstream such as performance of flotation or regrind mills with availability and maintenance of critical sensors such as pulp density particle
Grinding Circuit an overview ScienceDirect SAG mill product feeds two parallel ball mills of m× m internal diameter×length each with a MW twin pinion drive The ball mills are operated at a ball charge volume of 30 32% and % critical speed The SAG mill trommel undersize is combined with the ball mills discharge and pumped to two parallel packs clusters of twelve 660
How grinding mill design changed over the last · Note that ball mills are heavier than SAG mills therefore it may be misleading to think that large SAG mill designs lead the way Reference Autogenous and Semiautogenous Mills 2015 Update by F Tozlu M Fresko 2015 SAG Conference Vancouver British Columbia September 2015 and other OEM installation lists Effect of OEM mergers on grinding mill design A wave of grinding mill
STARTLING EFFECT OF BALL SCATS REMOVAL ON SAG MILL the ball scats from a single stage SAG mill These scats are non spherical ball fragments resulting from uneven wear of balls with included porosity 30t of scats were removed from a total charge
A Method of C alculating Autogenous/ Semi Autogenous SAG mills mimic the same shortcoming It follows that in order to obtain the specifi c energy SE to achieve a certain transfer size based on the 80 per cent passing value an ineffi ciency factor must be applied to the SE of single stage ball mills rod mills or AG/SAG mills when calculating power according to the Bond Third Theory method Rod mill and AG/SAG mill products are similar and
