one SAG mill (9.75 dia.(m)*3.88 length(m)) following two parallel ball mills (5dia.(m)*7lenght(m)). The aim of this research work was to investigate on the ball filling estimation of Miduk semi-autogenous (SAG) Mill via an utilized method. Miduk SAG Mill circuit is shown in Figure 1. Figure 1: Diagram of Miduk Copper Complex
LG A mill power equation for SAG mills. Minerals and Metallurgical Processing. Feb 1990 pp57-62. Gross power No load power Net power drawn by the charge (8.13) The net power is calculated from Net power KD2.5L e! c./ Watts (8.14) In equation 8.14, D is the diameter inside the mill liners and Le is the effective length of the mill including the ...
comparison of rod mill and ag / sag mill discharge gradations typical fine ag/sag mill discharge gradation envelope of ag/sag & rod mill product sizes 1 1 10 100 1000 10000 100000 c u m % p a s s i n g ... the dbc ag/sag efficiency factor graph has been developed over many years it was thought in the early years the factors varied from: 1.13 to ...
Plant Concept SAG Circuit HPGR Circuit Equipment 1 x SAG Mill 9.8 MW 1 x Secondary Crusher 750 kW 1 x Pebble crusher 450 kW 1 x HPGR 4.0 MW 2 x Ball Mills 5.6 MW each 2 x Ball Mills 5.6 MW each Screens and conveyors 0.5 MW Screens and Conveyors 1.5 MW Total drive capacity installed 21.95 MW 17.45 MW
SAG mills grind ore by lifting it and a small amount of grinding media and dropping it inside a horizontal mill. Ball mills are smaller and use a higher concentration of iron balls to pummel the ore. ... Torque is simply the way a twisting moment load is applied to a bolt to get it to stretch, explained James Brooks, director-new business ...
A further explanation is required to explain the importance of designing the SAG mill chamber to draw required power at optimum operating conditions of 75% …
The beneficial effects of increased SAG mill discharge percent solids on SAG mill throughput may be observed along all lines of constant volumetric loading. …
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.
A power curve is a graph that shows the wind speed and the output power of the wind turbine over a range of wind speeds from zero to the maximum wind speed for which the wind turbine is designed. Figure 1 shows a graph of a power curve for a wind turbine. On this graph, the wind speed is shown on the x-axis of the graph from 2 to 21 m/s.
The Huckleberry mine, located in British Columbia, produces roughly 40 million lb/y of copper. A comprehensive energy and cost study compared an existing SAG mill-based circuit at the Huckleberry mine with two proposed circuits involving comminution technologies that are associated with energy efficiency: high-pressure grinding rolls …
SAG mills mimic the same shortcoming. It follows that in order to obtain the specifi c energy (SE) to achieve a certain transfer size, based on the 80 per cent passing value, an ineffi ciency factor must be applied to the SE of single stage ball mills, rod mills or AG/SAG mills when calculating power according to the Bond Third Theory method.
Ball mills in HPGR-Ball mill circuits tend to have more installed capacity than their counterparts in AG/SAG-Ball mill circuits. This is because the product size distribution from AG/SAG mills ...
(EGL) SAG mill driven by a 24,000 kW gearless drive. The SAG mill feeds two FL ball mills each 26 ft. in diameter × 40 ft. long (EGL), each driven by a 16,400 kW drive. The SAG mill is one of the largest volumetric capacity SAG mills in the world and represented the first 40 ft. SAG mill in Peru (Garcia & Villanueva, 2013 [1]).
Semi-autogenous grinding mills play a critical role in the processing stage of many mining operations. They are also one of the most intensive energy consumers of the entire process. Current forecasting techniques of energy consumption base their inferences on feeding ore mineralogical features, SAG dimensions, and operational variables. …
1 in4 = 4.16x105 mm4 = 41.6 cm4. 1 cm3 = 10-6 m = 103 mm. The standard method for specifying the dimensions of a American Standard Steel Channels is like C 5 x 9. which is a beam 5 inches deep with a weight 9 lb/ft. I-shaped cross-section beams: Britain : Universal Beams (UB) and Universal Columns (UC) Europe : IPE. HE. HL. HD and other sections.
From the Quick Selector Chart on page 234, make a tentative chain selection as follows: a)Locate the design horsepower calculated in Step 3 ... pug mill M Compressors Centrifugal U lobe M reciprocating multi-cyl. M reciprocating single-cyl. H Conveyors apron U assembly U belt U bucket U chain U flight U oven U screw U Conveyors, Heavy Duty
the sag ratio for beams, that is, the ratio of mid-ordinate to chord, is so small, it gen-erally is accepted that adequate accuracy results if the camber curve is considered to be a segment of a circular curve. Some camber calculations are based on circular curves. Camber usually is expressed in terms of the maximum ordinate at mid-span.
In 2010 Newmont made the decision to purchase a 42 foot (ft) Semi-Autogenous Grinding (SAG) mill from and a 28 Mega-Watt (MW) Gearless Mill Drive (GMD) from ABB …
A further explanation is required to explain the importance of designing the SAG mill chamber to draw required power at optimum operating conditions of 75% critical speed and less than 30% by volume load. Recent studies in the three-foot diameter SAG mill are instructive. The following graph shows the relevant facts as Figure 2.
The graph of SAG pinion energy (to 1.7mm) Vs Bond BM Wi is given in Figure 3. Excluding the very soft and very hard projects, shows that the database in general does support a broad correlation between SAG and ball mill hardness but that the function is -defined to be useful in sizing a SAG too ill mill from a Bond BM Wi measurement.
The author has developed a simple and sound approach to determine the preliminary SSSAG mill aspect ratio before conducting population balance model simulations. The approach developed takes into ...
The SAGDesign test and design equations give the energy to grind an ore from 80% passing 152 mm to 80% passing 1.7 mm. Since this transfer size is fine enough feed for a ball mill no ball milling inefficiencies will occur. A 5 mm closing screen will deliver this approximate size of SAG ground product to the ball mill.
The control of a milling operation is a problem in imponderables: from the moment that the ore drops into the mill scoop the process becomes continuous, and continuity ceases only when the products finally come to rest at the concentrate bins and on the tailing dams. ... With the above chart the per cent solids or specific gravity of a pulp …
Power quality is related to fluctuations in the electrical supply in the form of momentary interruptions, voltage sags or swells, transients, harmonic distortion, electrical noise, and flickering lights, among others. The electrical power grid is designed for delivering power reliably, namely maximizing power availability to customers. However ...
The present manuscript focuses on the development of a multivariable control based on the MPC strategy for a semiautogenous grinding (SAG) device. A previously …
This method simulates the particles size, mill power, and qualified particles quality of crushed particle, which reveal the grinding strength and energy consumption of the SAG mill. In this paper, the …