PDF Understanding the effects of liner wear on
8 9 August 2011 Perth WA Fig 1 Increase in throughput over liner life for a large SAG mill Unfortunately however the 32 ft SAG mill that was studi ed for this project does not feature
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8 9 August 2011 Perth WA Fig 1 Increase in throughput over liner life for a large SAG mill Unfortunately however the 32 ft SAG mill that was studi ed for this project does not feature
Sag Mill Grinding Solutions Ltd Sag mill grinding solutions offers the following tests for sag mill testing andor sizing jktech drop weight the jktech dropweight test measures the breakage characteristics of an ore for five size fractions in the range of 13 to 63 mm at various energy inputs 01 to 25 kwht
for SAG and FAG mills and gives the results of recent investigations of the physical processes occurring in autogenous grinding The breakage process is treated as the sum of three regions of breakage actions normal breakage caused by nipping of particles between media steel balls or pebbles abnormal breakage caused by media when the particle or lump is too big in relation to the media to
As one of the machines widely used in mining a semi autogenous grinding SAG mill can significantly improve the roughing efficiency of rock But the SAG mill still faces the obstacles of significant energy consumption and empirical operation parameters In order to obtain the optimal operation parameters of a SAG mill in this paper the discrete element method DEM is used to simulate the
· In order to obtain the optimal operation parameters of a SAG mill in this paper the discrete element method DEM is used to simulate the breakage process of the particles by controlling three
In modeling grinding mills three basic phenomena including mass transfer breakage function and Selection function need to be described Different methods for determining the breakage function
breakage in sag mill t10 % Weighted Fit 63 x 53 represents an ore s resistance to impact breakage The parameters A b and ta have no physical meaning in their own right They are ore hardness parameters used by the AG/SAG mill model in JKSimMet which permits prediction of the product size distribution and the power draw of the AG/SAG mill for a given feed size distribution and feed rate In 0
Sag Mill Liners Breakage Grinding Classification The plus ore will be handled separately and the two will be stored in separate stockpiles The feed to their SAG mills will be a mix of the two the plus as media rock and the minus as rock to be ground The ultimate product from their SAG mill will be about 6 Mesh mm Further grinding will be by ball mill after magnetic separation at
Ball mills break rock by compression fracture while SAG mills predominantly break by shear Some compression fracture does occur but it is not the major comminution mechanism Cataracting and cascading of balls onto ore also aid but we believe they have a minor role as well
SAG mill design and optimization decouples contributions of ore and grinding environment describes each breakage mechanism in AG and SAG mills over a wide range of sizes and collision energies describes mechanistically the effect of mill design and operating variables
About 91 of these are mine mill low wear rate grinding media of mining sag mill with 100mm Get Price SAG Mill Testing Test Procedures to Characterize Ore Comminution grindability grinding SAG mill AG mill milling HPGR work The resistance of ore samples to breakage or hardness is measured through grindability testing
However the breakage mechanism of an AG/SAG mill is inefficient in grinding particles of a certain size typically in the range of 25 55 mm pebbles Therefore cone crushers are often used as pebble crushers and integrated into AG/SAG mill circuits to break the critical size particles that accumulate in the mill and to increase the performance of the primary grinding circuits Many
SAG Mills Archives Mineral Processing Metallurgy In an AGSAG mill there are two main mechanisms of breakage namely impact high energy and abrasion low energy The industry accepted JK impact breakage parameters A and b can reliably be determined using the new generation high throughput JK Rotary Breakage Tester JKRBT Details
attendant breakage of particles as they are influenced by moving liner/lifters and grates This paper presents the application of high fidelity 3D simulation techniques to the optimization of SAG mill performance through 1 Changes in liner/lifter design to maximize throughput while maintaining acceptable wear levels 2 Changes in ball size to
Does anyone know about determining the breakage function of SAG Mill using JKMRC method and determining the b i j for all sizes Gruppen 5 years ago Gruppen 5 years ago Like You did not say why you need the breakage function If you are optimizing an existing SAG mill the JKMRC people will help you with your question If however you are designing a new SAG mill the direct measurement of
Abstract In the existing JKMRC breakage testing method for AG/SAG mill modelling ore is characterised using mainly high energy single impact tests However recent DEM studies have suggested that breakage in AG/SAG mills is mainly due to low energy repetitive or multiple collisions rather than single high energy impacts Furthermore several of the published AG/SAG ore hardness
Sag Mill Liners Breakage Grinding Classification The plus ore will be handled separately and the two will be stored in separate stockpiles The feed to their SAG mills will be a mix of the two the plus as media rock and the minus as rock to be ground The ultimate product from their SAG mill will be about 6 Mesh mm Further grinding will be by ball mill after magnetic separation at
system of rock breakage involved in the blasting crushing and SAG milling of hard brittle ores The design of such blasts falls outside the conventional envelope of experience for most engineers and requires the consideration of some critical factors if the objectives of such blast are to be met and some of the potential problems are to be avoided Experience to date has also found that the
Abstract In the existing JKMRC breakage testing method for AG/SAG mill modelling ore is characterised using mainly high energy single impact tests However recent DEM studies have suggested that breakage in AG/SAG mills is mainly due to low energy repetitive or multiple collisions rather than single high energy impacts Furthermore several of the published AG/SAG ore hardness
Sag Mill Grinding Solutions Ltd Sag mill grinding solutions offers the following tests for sag mill testing andor sizing jktech drop weight the jktech dropweight test measures the breakage characteristics of an ore for five size fractions in the range of 13 to 63 mm at various energy inputs 01 to 25 kwht
· However the breakage mechanism of an ag/sag mill is inefficient in grinding particles of a certain size typically in the range of 25 55 mm cone crushers are often used as pebble crushers and integrated into ag/sag mill circuits to break the critical size particles that accumulate in the mill In ball mills steel balls or hard pebbles to break particle based on impact and
· First we built a three dimensional model of the SAG mill Then we used the breakage energy method to set up two sets of simulation schemes to simulate the influence of the mill speed 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
At SAG 2006 we reported the simulated and measured outcomes of treating a well characterised ore in a m diameter mill This well instrumented pilot scale mill at the University of KwaZulu Natal has been combined with some new approaches to ore testing to allow different modes of breakage to be tested The mill design allows the rate of generation of fine material to be measured in close
In AG/SAG mills there are two main breakage mechanisms impact high energy and abrasion low energy For impact breakage mechanism JKMRC institute is using the model of the percentage of broken product passing 1/10 the original particle size t 10 Equation 3 relates t 10 to E CS which
About 91 of these are mine mill low wear rate grinding media of mining sag mill with 100mm Get Price SAG Mill Testing Test Procedures to Characterize Ore Comminution grindability grinding SAG mill AG mill milling HPGR work The resistance of ore samples to breakage or hardness is measured through grindability testing