sag mill feed size

1 IMPROVEMENTS IN SAG MILL THROUGHPUT FROM FINER FEED SIZE AT THE NEWMONT AHAFO OPERATION Adrian Dance1 Sonny Mwansa2 Walter Valery 2 George Amonoo3 and Bryon Bisiaux3 1SRK Consulting Canada Inc 22nd Floor 1066 West

Relation between Sag mill solid and product P80 Both are dependent on feed size Dependent on Volume solids in SAG mill Dependent on ball charge volume Hardness of ore Recirculation load Dependent on P80 size All other parameters are secondary In general Sag mill solids are kept at 70 by wt Operating grinding circuit is an art

They have not yet received wide application in plant design because of their complexity A common characteristic of the conventional approaches is the representation of feed and product size distributions by a single parameter normally the D80 passing size

SAG Mill Ball Size Evaluator Evaluation Factors Calculate Diameter If the feed topsize is 100 mm then typically a 5″ ball is suitable To date I have not seen any clear evidence of improved throughput from a 55″ or 6″ ball size alone combined with lifter profile changes yes Ball load is also a factor

Feed Size VS Ball Size 7 replies One can argue the f50 is a more realistic value since balls wear and the average ball size might be closer to half the maximum Then the multiple would be closer to 13 times the maximum particle size fed to the ball mill A f80 6 mm would need a ball size of 75 mm

The capacity of the SAG mill is related to lots of factors such as feed size size distribution discharge size and grindability etc and it should be confirmed according to the actual situation SM4014’means it is a dry mill

•Decreasing the SAG mill diameter by 2 feet from 36 to 34 ft causes a 2 MW reduction in installed SAG power or an 18 decrease from 11 to 9 MW This energy can reduce grinding capacity by about 9 considering the ball mill if it also has 11 MW of installed power

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 A SAG mill with a 44 134m diameter and a power of 35 MW 47000 HP has been designed Attrition between grinding balls and ore particles causes grinding of finer particles SAG mills are characterized by their large diameter and short length as compared to ball mills

mill circuit and the feed of the ball mill circuit Hence if powerbased equations such as eq 1 and eq 2 are to be used to predict the SAG mill circuit and ball mill circuit specific energies it

Feed size effects what size is important historically MinetoMill has – focussed on blasting alone – generation of more fines • pass through SAG mill onto ball mill circuits • higher throughput eg 10 to 30 • coarser grind size possibly fine 25mm medium 25 75mm coarse 75mm

Metso 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

AGSAG mills 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 of a ball mill Because of the range of mill sizes available AGSAG milling can often be accomplished with fewer lines than in a conventional rod millball mill

Modelling SAG milling power and specific energy consumption including the feed percentage of intermediate size particles M Silva A Casali⇑ Mining Engineering Department Universidad de Chile Beauchef 850 Santiago 8370448 Chile

Wet grinding is accomplished in a slurry of 50 to 80 percent solids AGSAG mills 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 of a ball mill

Two new SAG milling models are developed in this work able to predict power or specific energy consumption including the usual design variables such as mill size balls charge level solids concentration in the SAG mill feed and of critical speed but adding a variable that represents the feed size

SAG Mill It accepts energy in the form of Redstone Flux or Minecraft Joule with an internal buffer of 100000 RF and consumption of 20 RF per tick The energy storage capacity and processing speed can be increased by adding one of 3 tier of Capacitor into the upgrade slot The energy consumed varies on the item processed

While AG mills operate without a ball charge SAG mills use a grinding media charge of normally 3 12 for comminuting the feed material The maximum feed size is between 200 mm and 500 mm The AGSAG mill is normally installed upstream of a tube mill operating in closed circuit with hydrocyclones

The different response of ag and sag mills to changes in feed size is not unexpected and has been reported previously Morrell and Morrison 1996 It arises from the fact that in ag mills some

Typically a SAG mill based circuit P80 of 106 to 150 um has media costs of around A1t Providing the ore is amenable the use of primary autogenous milling can

Model Predictive Control for SAG Milling in Minerals Processing 5 Model Predictive Control on a SAG Mill and Ball Mills The solution for the SAG Mill is an adaptive controller which controls mill load using direct mill weight measurement or indirectly from bearing oil pressure

feed size F80 of over 70 mm and a SAG mill throughput of 5200 th The Batu Hijau SAG mill specific energy was a function of point load test and RQD The point

Oct 12 2017 · Today we will learn about difference between sag mill vs ball mill A mill is a machine by which solid or hard materials are broken into smaller pieces by means of grinding crushing or cutting This commutation is an essential part of many processes

After closedcircuit secondary crushing the SAG mill feed 80 passing F80 size was 25 mm to 30 mm Installed grinding power is split equally between the two mills with the SAG mill fitted with a variable speed drive VSD SAG discharge screen oversize ‘pebbles’ or ‘scats’ was

DESIGN OF THE 40 FOOT DIAMETER SAG MILL INSTALLED AT THE CADIA GOLD COPPER MINE of the engineering a flowsheet review was undertaken This led to a A SAG mill feed size F 80

LG A mill power equation for SAG mills Minerals and Metallurgical Processing Feb 1990 pp5762 Gross power No load power Net power drawn by the charge 813 The net power is calculated from Net power KD25L e c Watts 814 In equation 814 D is the diameter inside the mill liners and Le is the effective length of the mill including the