A laboratory study of the performance characteristics of mill pulp lifters Author links open overlay panel SR , In conjunction with the grate open area, the performance of the pulp lifters dictate the volumetric discharge rate of slurry out of the mill , 2 opposing effects which result in a maximum discharge rate at a speed which is of .
discharge pump (grate and pulp lifters) operat The essential function of a pulp lifter is to transport the broken material and slurry from the discharge grate out of the mill Hence, the design optimisation of pulp lifters affects not only the energy efficiency and throughput of autogenous grinding/semi-autogenous (AG/SAG) grinding
However, little or no work has been reported on the performance of grate-pulp lifter assemblies and in particular the influence of pulp lifter design on slurry transport Ideally, the discharge rate through a grate-pulp lifter assembly should be equal to the discharge rate through at a given mill hold-up However, the results obtained have .
The liner design has a huge impact on the mill performance and the total milling cost The , Figure 11—Effect of the discharge modification on the liners high grinding media wear rate (1 200 g/t) A new liner , primary ball mill from grate to overflow discharge while ,
Mill Type Overview Three types of mill design are common The Overflow Discharge mill is best suited for fine grinding to 75 – 106 microns; The Diaphram or Grate Discharge mill keeps coarse particles within the mill for additional grinding and typically used for grinds to 150 – 250 microns; The Center-Periphery Discharge mill has feed reporting from both ends and the product discharges .
Different combinations of SAG mill ball charge and grate open area were tested until 2006 A higher load level was achieved after several changes in the grate design that prevented both liner and grate breakage Upon resolution of issues related to the mill grate design, the project achieved the target throughput of 41 kt/d Phoenix
Improve grate discharge design to keep pulp level constant all through the mill length Optimize and control the mill media filling degree to reduce production costs while keeping the same grinding performance Back to Home Page Request More Info Download Brochure
Grate discharge Dry Grate discharge Wet Overflow discharge Wet Figure 85 Effect of mill filling on power draft for ball mills The data is taken from Rexnord Process Machinery Reference Manual, Rexnord Process Machinery Division, Milwaukee, 1976 The effect of varying mill speed on the power drawn by the mill is shown graphically in Figure 84
The literature exposed a clear lack of previous research on the influence and performance of grate/pulp lifter design in AG/SAG mill discharge The current understanding from literature lacks knowledge of mill content size distribution and its effect on discharge through the grate ,
IMPROVEMENTS IN SAG MILL THROUGHPUT FROM FINER FEED SIZE AT THE NEWMONT AHAFO OPERATION , identify where the opportunities were greatest and what effect the combined changes would have on mill performance , initiate rock characterization and collect measurements of blast fragmentation and mill performance This
Discharge grates are one of the most important parts of SAG mills These grates prevent balls and unbroken ores from discharging the mill and they have a significant effect on the mill filling and size distribution of the discharge flow To consider the effect of openings of the grates on the overall efficiency of the comminution operation, the variation of the grates shape and size were .
The discharge end of the Grate Discharge Ball Mill has at least ten times the discharge opening area, through the grate slots, compared to the common trunnion overflow type mill The discharge grates are designed to run clean and free of any blinding or choking The pulp level in the mill may be varied by merely changing the pulp dilution
The effect of liner wear on SAG mill performance has gained much attention in recent years It is commonly observed that the three key performance criteria of SAG milling; throughput, power and product size all improve as the liner wears The increase in throughput is generally ascribed to the increase in the grate apertures and.
May 08, 2015· Pegging of the discharge grates in SAG mills often occurs and this will result in a drop in throughput The effect of new grates can be simulated in terms of new open area, size of apertures or .
grate sizing of the SAG mill The current steel discharge grate opening in the SAG mill are inadequately sized to allow worn steel grinding media to pass through This has resulted in excessive amount of small grinding media inside the mill reducing its effectiveness This in turn, has created
>liner design ,with the advent of large diameter sag mills, the issues of design, selection, monitoring and evaluation of mill performance is critical grate inside a sag mill inner grate plate shell lifter charge lifter rubber liners >commonly used for ball mills because of long life >change out is easy
SAG/AG SCU SAG/AG Sentinel Camera Unit (SCU) Concept of System The SCU uses the latest technology in high-definition imagery within a custom designed housing, permanently affixed to the feed chute to provide a live audio and temperature feed in a running SAG mill and video feed from inside a stationary SAG mill
Jun 20, 2015· The effect of Ball Mill RPM speed going from sub-critical to super-critical helps understand the Ball Mill Working Principles of ball-on-ball VS ball-on-shell grinding The Motion of the Ball Charge
An extensive experimental campaign was developed in a continuous 6 x 2′ (D x L) pilot scale SAG mill The effect of the feed flow rate, feed solids concentration, ball filling fraction and feed size distribution, over the mill performance was investigated The residence time distribution (RTD) for the fine material was measured in every.
Improve grate discharge design to keep pulp level constant all through the mill length Optimize and control the mill media ﬁlling degree to reduce production costs while keeping the same grinding performance Figure 2 Example of MillScanner™ being used in a GrindingExpert™ solution!!!!!
discharge mode does vary substantially between hol-low discharge trunnions to screen plates (grates) that can be either placed at the periphery of the cylinder or radially to the trunnion The mill shell is internally protected by means of steel liners Today’s extensive use of AG/SAG mills is credited to the combination of relative high .
the effects of grate wear on mill performance to be quantified Fig 13: Breakage rates of all surveys The calculated breakage rates (Fig 13) will be a useful measure of the ch ange in mill .
and size distribution, water discharge rate, ball throughput, bearing pressure, pebble throughput, and toe and shoulder angles of the internal load 21 SAG mill model The particles fed to the mill are ground in the milling chamber and subsequently downloaded into the discharge zone, where, according to a classification probability, they
startling effect of ball scats removal on sag mill performance - Gekko , Overflow VS Grate Discharge Ball or Mill - Why Retrofit - Mineral Mar 19, 2017 Allow me to compare: Ball mills can be of the overflow or of the grate discharge type , An Experimental material transport in performance improvement of AG/SAG mills and the limited
Ball mill discharge grate vs overflow Sag mill grates - gezinsbondsint-amandsbe effect of grate discharge area of sag mill performance optimization of mill performance by using - saimm - effect of grate discharge area of sag mill performance,optimization of mill performance by using online.
the primary crushed feed ore and operates in closed circuit with pebble crusher SAG mill discharge passes through grates and screened by a trommel with the oversize being recycled by conveyor back to the SAG mill Combined product from the SAG mill (trommel undersize) and the Ball mill discharges into a common mill discharge hopper
Slurry discharge capacity of autogenous and semi autogenous mills and the effect of grate design Inernational Journal of Mineral Procesing Vol 46: 53-72 26 MORRELL, S and MORRISON, R (1989) Ore charge, ball load and material flow effects on an energy based SAG mill model SAG Milling Conf 89, Murdoch University WA, pp 27
DISCRETE ELEMENT METHOD MODELING OF PULP LIFTER PERFORMANCE Pengbo Chu Department of Mechanical Engineering McGill University Montreal, Canada August 2011 _____ A thesis submitted to McGill University in partial fulfillment of the requirements for ,
sag mill grates - gezinsbondsint-amandsbe effect of grate discharge area of sag mill performance Optimization of mill performance by using - SAIMM - effect of grate discharge area of sag mill performance,Optimization of mill performance by using online ball and pulp measurements Soon after a stop, a mill is a dangerous place to enter for the personnel tasked with Overflow VS Grate
May 08, 2015· Pegging of the discharge grates in SAG mills often occurs and this will result in a drop in throughput The effect of new grates can be simulated in terms of new open area,