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 ... hence minimizing energy consumption for a given mesh of grind. Reinforcing this idea, Mclvor and ...
work index RWI; for finer particles — ball milling work index BWI (Table). These indexes are readily obtained using the specialpurpose laboratory equipment (Fig. 1). Finding the total specific energy consumption in the wet autogenous mill — central discharge ball mill circuit (WAM — CDBM) In the framework of the discussed method, total ...
Abstract. Nkwanyana and Loveday (2017) used batch grinding experiments in a m diameter mill to test partial replacement of steel balls ( mm) for secondary grinding, by partly rounded pebbles (1975 mm) from a SAG mill. At the optimum pebble content of 25% by volume, a 25% saving in steel ball consumption and a 15% saving in energy ...
Compared to ball mills HPGRs achieve a 30 to 50% lower specific energy consumption, although they are not as common as ball mills since they are a newer technology. ... SAG mills use a ball charge of 8 to 21%. The largest SAG mill is 42' () in diameter, powered by a 28 MW (38,000 HP) motor. A SAG mill with a 44' () diameter and a ...
SAG Ball consumption is "average" at 400 g/t while Ball Mill grinding media (3″ balls) usage in 550 g/t. Yet, you add steel and nothing seems to happen, tonnage is not noticeably improved. You need more tonnage and could actually use a larger/coarser transfer size from the SAG to Ball Mill. The ore is "hard" and "bulky".
decrease in media consumption, not just in the SAG mill but also the ball mills. Copper Mountain (Rose et al., 2015) have reported a 37% decrease in SAG mill grinding media and a 66% decrease in ...
Models for the prediction of the power drawn by ball, semiautogenous and fully autogenous mills have been developed and cited in the technical literature ( Turner, 1982, Austin, 1990, Moys, 1993, Morrell, 1996 ). However, none of these models considers the feed size distribution as a design variable.
results in less impact on the ball charge, with a corresponding decrease in ball breakage and ball FIGURE 8 illustrates the measurement of power under consumption. closely controlled conditions on the 40 ft ( m) diameter Cadia SAG mill.
If P is less than 80% passing 70 microns, power consumption will be; Ball Mill Power Calculation Example #1. A wet grinding ball mill in closed circuit is to be fed 100 TPH of a material with a work index of 15 and a size distribution of 80% passing ¼ inch (6350 microns). The required product size distribution is to be 80% passing 100 mesh ...
Ball Mill Media (kg/kWh) = *Ai^ Aidan Giblet and J. Seidel published a paper on the 2011 SAG conference (MEASURING, PREDICTING AND MANAGING GRINDING MEDIA WEAR) and they obtained. Ball Mill Media (kg/kWh) = (Ai) the two equations are very similar.
SAG mills use a combination of steel balls and rock particles as grinding media, while AG mills use only the ore itself. Both types of mills are used for grinding ore in mineral processing operations, but SAG mills are larger in size and can grind larger quantities of ore.
Hlungwani used the DEM to study the effect of the number and the shape of liners on the power consumption of the SAG mill, ... Wang, H., Wang, S., and Lv, W., Effect of Lifters and Mill Speed on Particle Behaviour, Torque, and Power Consumption of a Tumbling Ball Mill: Experimental Study and DEM Simulation, Miner. Eng., 2017, vol. 105, pp. 225.
Tubular Ball Mills . 01 01 2016 A 5 5 m 5 5 m ball mill is lined with single wave liners 65 mm thick which cover the entire inside surface The centre line length was 4 2 m and the trunnion diameters 1 5 m in diameter The mill was charged with an ore and 100 mm diameter steel balls as the grinding media so the total filling of the cylindrical section was 40 and the ball fractional filling was 0 15
the fill level ratio, and the steel ball ratio on the SAG mill. Finally, through statistics and analysis of particle information and mill power under different conditions, we analyzed the influence of three parameters on the particle fracture effect in the SAG mill and obtained the best operating parameters of the SAG mill. 2.
Precrushing feed to the SAG mill may also increase the SAG Mill POWER consumption. Others have played with precrushing down to 50 mm but what is the point? You may as well replace the SAG mill with a large Ball Mill. HPGR is now developed to the point that it is actually being considered as a replacement for SAG technology. Something to think ...
Rajamani,, Mishra,, 1996. Dynamics of ball and rock charge in sag mills, in: Proc. SAG. ... on various aspects such as energy consumption, mill efficiency, minerals liberation and ...
Helps your mill operate more efficiently and lowers your energy consumption ... The AutoCharge system is primarily suitable for SAG mill balls (100150 mm). As each ball rolls through the counting chute, an electromechanical limit switch is activated, signalling the counter. Each count is added to the last, allowing a continual increasing ...
In a SAG mill the dimensions of the mill were m × m and the specific gravities of the mineral and that of the balls charged were and respectively.. The mill was rotated at 75% of its critical speed when 8 % of the mill volume was charged with grinding :1. The mill power drawn, 2. The maximum mill filling possible.
SAG / Ball Mill Monitoring Condition Monitoring to Ensure Reliability for Critical Grinding Equipment in Mining Today's mining operations must keep crucial milling assets online and running optimally, but variations in ore particle size, feed rate and moisture content, can lead to plugging, high vibration and machine bearing wear, and ...
Ball milling capacity can be justified if the incremental decrease in specific power consumption for the primary mill, for example between 500 and 1000 microns for primary mill circuit product. ... Current operational results show that the SAG mill is operating at 5% ball charge level by volume and is delivering a K80 800 micron product as ...
In semiautogenous grinding (SAG), the grinding mill inventory, ( volume of total charge, volume of ball charge, etc.) is important in determining the optimum operating condition for maximum production (tph), minimum specific energy (kwh/t) or lowest cost (/t). A twodimensional graphical method is presented for determining the actual ball charge within the total charge when parameters ...
However, the effects on power consumption and mill capacity have been the same, confirming the strong effect of small variations in the ultrafines production. ... it can be fed to the SAG mill. In that case the ball mills are fed with a fraction of the SAG mill discharge, as in the original circuit (Figure 1).
The average saving in energy consumption was about 13% and a saving in ball consumption of 25% applies. ... Modifications to the SABC comminution circuit included an increase in the SAG mill ball ...
Current semiautogenous grinding (SAG) operating SAG and ball mills by 10% by optimizing the grinding and ball mills are inherently inefficient, producing an instantaneous 'grinding (breakage) conditions. pulse'. They can then adjust the using less than 1 percent of the energy • Reduces steel consumption operating parameters to optimize mill
In relation to the electrical energy consumption, SAG mills had the highest proportion embodied energy, followed by ball mills and stirred mills. The effect of circuit type on media consumption was also analysed, however, no clear difference in media wear for particular circuit types could be inferred from the current dataset (see Figure 2).
Principle of SAG Mill operation. SAG is an acronym for semiautogenous grinding. SAG mills are autogenous mills that also use grinding balls like a ball mill. A SAG mill is usually a primary or first stage grinder. SAG mills use a ball charge of 8 to 21%.[6][7] The largest SAG mill is 42′ () in diameter, powered by a 28 MW (38,000 HP ...
A total of 120 t of Cristalino ore was prepared and sent to CIMM, where it was crushed and screened prior to grinding tests. The processing equipment included a m (8′) diameter by m (2′) length AG/SAG mill equipped with a 20 kW motor, a cone crusher, a m (3′) diameter by m (4′) length ball mill equipped with a 15 kW ...
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