Effect Of Sag Mill Feed Size Distribution And Ore


Application of Operating Work Indices in Autogenous

the size distribution data graphically it is readily evident from Figure 1 that the AG/SAG circuit (transfer) product has a much flatter slope than that of the final product TECHNICAL PAPER 2001-47 pArAmeter vAlue Feed Size F 80 (mm) 177 Transfer Size T 80 (μm) 726 Product Size P 80 (μm) 74 AG/SAG Wio AWio (kWh/t) 28 5 Ball Mill Wio BWio 8 6

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Modelling SAG milling power and specific energy

The feed size distribution is also the implicit result of the ore competence (affecting blasting and crushing performance) This distribution affects the SAG mill load and the load affects directly the mill power and the efficiency of the mill operation (Van Nierop and Moys 2001) If a SAG mill

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Applying grindcurves to mill operation and optimisation

Factors such as mill speed mill inlet water feed size distribution and ore hardness all have an influence on the grindcurve and form an integral part of the optimisation process Test work has been conducted at a number of sites to develop grindcurves for different mills treating a range of ores

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Influence of blasting on the size distribution and

– a higher ore concentrate grade or mineral recovery – an improved or at least maintained fragmentation with a lower explosives consumption The focus in this review is on the energy expenditure and the influence of blasting on the size distribution and properties of muckpile

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Sustainable Optimisation of the Bell Creek SAG Mill

As discussed earlier feed size and ore hardness have a noticeable impact on SAG mill load and performance To stabilise the load in the SAG mill 'degrees of freedom' must be adjusted sometimes significantly In manually controlled SAG mill operations the most commonly adjusted parameter for load stabilisation is tonnage

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AMIT 135 Lesson 7 Ball Mills Circuits

Ball Mill Size as a Replacement Grinding media wears and reduces in size at a rate dependent on the surface hardness density and composition of the ore Ball wear is directly proportional to surface area per unit mass and thus inversely proportional to ball diameter

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Crushing SAG Mill Critical Size Material

Secondary mill feed – Continuous regulation capability gate to allow controlled distribution of feed between the two ball mills Finally if the amount of critical size material removed from the mill is less than the crusher and secondary mills capacities those mills can also be fed with a small fraction of the SAG mill trommel undersize in

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Gold extraction

The primary reason for the significant comminution circuits is because in gold mining the grades are notably low and thus excessive waste material is present resulting in high mill feed rates If the ore rock is highly fractured and/or brittle it is likely that an AG mill be the most economical option in lieu of a

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Optimization of the Design of SAG Mill Internals Using

Optimization of the Design of SAG Mill Internals Using High Fidelity Simulation by John A Herbst Svedala Optimization Services and undisclosed behavior resulting from end-effects The power draw of the feed and discharge The selection of an optimum top ball size for a large SAG mill is determined by several factors

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A Method of C alculating Autogenous/ Semi

SAG mill energy required according to this statement is 2 5 times more than the Ab value to produce the same degree of particle breakage There is a speci fi c gravity factor that affects AG/SAG power draw The lighter material in the 2 5 specifi c gravity (SG) range will require more energy to grind to the same transfer size than an ore with a 3 5 SG

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Model Morrell SS SAG

Morrell Mi (SMC) single-Stage SAG Mill Model This is a SAG or AG mill model that estimates the specific energy consumption (E SAG) using the equations of Morrell (2004) Testwork Required The SMC™ test stored in the DWT testwork table (SMC is a Drop Weight Test) Bond ball mill work index

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The oversize material is recycled to the SAG mill feed via conveyors and the undersize material is combined in the cyclone feed sump with the ball mill discharge and feed to the ball mill classifying cyclones Product overflow from the cyclones is gravity fed to subsequent flotation processes and the underflow is feed to the ball mill

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Outotec RockSense on

A suitable ore feed size distribution is critical in order to achieve high grinding efficiency and throughput especially in the grinding circuits of AG or SAG mills Plant operators traditionally use visual information about ore appearance and size distribution when making key operational decisions

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EFFECTS OF GRINDING MEDIA SHAPES ON BALL MILL PERFORMANCE Ball size distribution inside an industrial mill was analysed in terms of shapes and sizes Load behaviour mill power and breakage as affected by media were noted with spherical media but the differences narrows with decreasing feed size

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The effect of mill charge is primarily through the shifting of the center of gravity and the mass of the charge As the LG A mill power equation for SAG mills Minerals and Metallurgical Processing Feb 1990 pp57-62 or large lumps of ore in an autogenous mill or a mixture in a semi-autogenous mill

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