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Jan 01, 2015· In Fig. 3, Fig. 4 the data is presented in order to show the effect of the fresh feed size, particularly the % −6″ +1″ (−152 +25 mm), on the SAG mill power consumption (Pc) in kW and on the SAG mill specific energy consumption (Ecs) in kW h/t, obtained by dividing the power consumed (kW) by the fresh feed rate (t/h).
Sag mill feed size distribution Henan Mining Machinery . A Nral Network Model for SAG Mill Control. SAG specific power range of about 3 to 9 kWht for this site The design of the ore stockpiling and conveying system contributes to fluctuating size distribution with significant shortterm segregation occurring under certain operating situations Depending on ore type and feed size distribution ...
sag mill power calculations The sag power index spi test starkey dobby 1996 uses a benchscale sag mill test to determine the specific energy of an industrial sag mill the test is operated in closed circuit and the time required to grind the material to a p 80 of 17 mm is used to predict agsag [email protected]
Development of SAG liners has always been of considerable interest to mill operators as liners significantly affect plant performance (throughput, grind size), material costs and plant downtime. Thus, operators commonly trial different liner shapes, profiles, and configurations.
The mill product can either be finished size ready for processing, or an intermediate size ready for final grinding in a rod mill, ball mill or pebble mill. AG/SAG 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 ...
= SAG mill feed sample mass, grams The ball mill pinion energy is determined from the Bond the Third Theory of Comminution : S dBWI = * / (P cs G pb ) / (10 / P 80 1/2 – 10 / F 80 1/2) where : S dBWI = Bond ball mill work index on SAG ground ore, kWh/ton ground F 80 = 80% passing of SAG ground of the test feed size ...
size reduction in a comminution device. Because grinding theories are imperfect and ore hardness can vary with size, grindability tests are designed to best represent the size reduction of the industrial equipment analysed. For that reason, it is preferable to design a primary ball mill from a rod mill work index rather than a ball mill
How a SAG Mill Works. SAG Mill grinding relies on the addition of balls to the primary mill which are required to break up harder and coarser pieces and also to grind midsize and and particles. It is used to grind ores which require fracturing across grain or crystalline boundaries in addition to attrition grinding.
Semiautogenous mills or SAG mills, as they are often called, can accomplish the same size reduction work as two or three stages of crushing and screening. Often used in grinding at modern mineral processing plants, SAG mills reduce the material directly to the desired final size or prepare it for the following grinding stages.
xG is the mill feed d80, not the circuit feed. For SAG mill, the xG value has to be determined by scalping of the full size distribution. The particles larger than the minimum pebble size (given by the pebble extraction grate opening) has to be excluded from the distribution to calculate the top ball size!
May 08, 2015· Before making a change in the SAG mill ball size it is important to test it first in simulation.
Obviously, the SAG mill is consuming more and the ball mill less power than was predicted by the empirical method, but the overall total is % of the predicted total. Examples. The Hemlo gold project of TeckCorona (1000 mtpd) provides an example of mill sizing .
The number of SAG mill revolutions required to grind the material to a P 80 of mm is used to predict AG/SAG specific energy using quation 4. Correction E factors for feed size and pebble ing are applied to the AG/SAG specific energy, as well as specific crush energy adjustment from mm to the mill transfer size T
SAG Mill Grinding Circuit Design. The following are factors that have been investigated and applied in conventional ball milling in order to maximize grinding efficiency: a) Mill Geometry and Speed – Bond (1954) observed grinding efficiency to be a function of ball mill diameter, and established empirical relationships for recommended media size and mill speed that take this factor into account.
Transfer Size, T80: Is the 80% passing size of ore as it passes from the SAG mill to the ball mill. It is typically about 1/3 the size of the screen opening but can be coarser than 1/3, especially when a pebble crusher is used. Screening at 5 mm ensures that the T80 will be about 10
Dec 12, 2016· If P is less than 80% passing 70 microns, power consumption will be. Ball Mill Power Calculation Example. A wet grinding ball mill in closed circuit is to .
Single stage SAG Mills are very beneficial in reducing CAPEX for plants with a staged throughput approach. When future tonnage is to be increased, the SAG Mill can feed downstream ball milling to boost capacity. FullerTraylor SAG/AG Mills range in size from through in diameter with powers as high as 28,000 kW.
A SAG Mill trommel screen lets you control the true discharge size of your SAG mill or the transfer size to the downstream Ball Mill circuit. A well sized trommel should not let rocks pass to the Ball Mill if they are to be more than say 5/8″ or 16mm In the image case below, strangely enough, is the mill shell liner and discharge grate ...
the SAG mill or Ball mill in the range of SAG product size adjustments from mm to mm. The SAG mill transfer size T80 can be adjusted using the Bond Work Index, for product sizes coarser or finer than the basic SAG product (T80) of mm. More specifically, in the T80 range of to mm,
Changes to the ore hardness, feed size or ore specific gravity require an alert operator to adjust the variables while keeping up with all the other demands in the plant. With the operator''s attention frequently drawn away from the SAG mill, the actual mill load would vary around the target, resulting in large corrections to the manipulated ...
Even though production was dramatically improved, the product size of the secondary ball milling was reduced and recovery increased. The results in SAGMill line 2 are even more dramatic. Because of segregation on the coarse feed stockpile, SAGmill 2 receives a higher percentage of coarse material.
The purpose of the primary crusher is to reduce the ROM ore to a size amenable for feeding the secondary crusher or the SAG mill grinding circuit. The ratio of reduction through a primary crusher can be up to about 8:1. Feed: ROM up to m; Product: 300mm (for transport) to 200mm (for SAG mill) Feed Rate: 160 to 13,000 tph
AG/SAG is short for autogenous mill and semiautogenous mill, it combines with two functions of crushing and grinding, uses the ground material itself as the grinding media, through the mutual impact and grinding action to gradually reduce the material size. SAG mill is usually used to grind large pieces into small pieces, especially for the ...
Every mining operation has a unique grinding process. has experience of over 8,000 grinding mills globally, including manufacturing and delivering the largest SAG/AG 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.
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