Jan 01, 2016· The SAG mill had a 6–8% ball charge and the power consumption was 8 kWh/t, which agreed well with the expected value 96 Problems 91 In an SAG mill the dimensions of the mill were 975 m × 35 m and the specific gravities of the mineral and that of the balls charged were 41 and 79, respectively
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mill speed and shell liner/lifter simulations and, particularly, ball charge volume and ball top size, both of which are dependent upon the contingency applied to the transfer size in the SAG circuit product Iterations of these para-meters can be performed in some models (eg, DJB’s “Reduced Recovery” and “Millpower2000”) to determine
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calculates the grinding charge of a ball mill | Mining & Quarry Plant
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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
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Rowling are used to calculate the mill power draw The Morgärdshammar equation and the IMM equations are shown for comparison The method of use is similar to the AM section 33 Ball Mill Design The ball mill designs also follow the Bond/Rowlings method with comparison with other methods Again the method of use is the same
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The Simple SAG Mill is a machine added by Ender IO It uses Micro Infinity (µI) to grind (or mill) items into their crushed variants, like Ores into Dusts The Simple SAG Mill has four output slots; recipes can have 1-4 different outputs, with different chances of obtaining those outputs Similar to Ender IO's other Simple machines, capacitors cannot be used in the Simple SAG Mill, so its .
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The Bond rod mill work index is used to calculate the power requirement at intermediate size, ie from 125mm to about 1mm The test has been mainly used for the design of rod mills or primary ball mills, but it can also be used along with the other Bond tests (BWI and cWI) for SAG mill design using semi-empirical relationship [6] BOND LOW .
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involve grinding) With Lloyd's ball milling book having sold over 2000 copies, there are probably over 1000 home built ball mills operating in just America alone This article borrows from Lloyd's research, which was obtained from the commercial ball milling industry, and explains some of the key design criteria for making your own ball mill
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compared to those from the ball mill circuit This has often resulted in conclusions concerning lower energy efficiencies of AG/SAG mill circuits compared to ball mills The correlation between the AG/SAG and ball mill circuit data is also very poor Use of equation 2 shows a very different picture, the results being illustrated in Figure 7
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Jul 01, 2021· As the SAG mill enters a stable operation state, the grinding system's charging behavior in the PH-SP and SP grinding systems is different As shown in Fig 9, the shoulder and the head in the SAG mill containing polyhedral ore particles are slightly higher than that of the SAG mill containing only spherical particl It means polyhedron .
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Mill Critical Speed Determination The Critical Speed for a grinding mill is defined as the rotational speed where the formula used for Critical Speed is N c, silicon Ball mills work well on The critical speed of a ball mill is calculated as 5419 in Coal ,
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The model made no specific distinction between ball, semi-autogenous (SAG) or autogenous (AG) mills except by virtue of their charge density and/or discharge mechanism
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predictions for different SAG and ball mill-based circuit configurations , harder components built up in the mill charge , mill work index test is used to calculate the work index related to .
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Enter the number of lifters that are exposed above the mill charge Fractions are acceptable and should be used in the case where the charge does not sit uniformly in the mill For example, you may have 29 rows exposed at the discharge end of the mill, and only 28 exposed at the feed end
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Apr 24, 2015· • Weight of the balls: With a heavy discharge of balls,we get a fine productWe can increase the weight of the charge by increasing the number of balls or by using a ball material of high density • Speed & rotation of Ball mill: low speeds,the balls simply roll over one another and little grinding is obtained while at very high speeds the .
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Aug 11, 2010· Re: MATERIAL RETENTION TIME IN A BALL MILL & VRM You could do that by measuring the material flowrate Q [tons/h] through the mill as well as the quantity M [tons] of material that accumulates within the mill The retention time, also called residence time, is the ratio (M/Q) [h] The flowrate Q could be measured from the production P [tons/h .
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Jun 19, 2015· We can calculate the steel charge volume of a ball or rod mill and express it as the % of the volume within the liners that is filled with grinding media While the mill is stopped, the charge volume can be gotten by measuring the diameter inside the liners and the distance from the top of the charge to the top of the mill
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Jun 19, 2015· 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 ,
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Ball-limited circuits (where the T 80 hits the lower limit) will result in the charge level in the SAG mill dropping until its power draw matches the throughput limit dictated by the ball mill It is important to realize that once the SAG mill charge level drops to be equal to the ball charge, the model will be operating "out of range" and the .
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If a ball mill contained only coarse particles, then 100% of the mill grinding volume and power draw would be applied to the grinding of coarse particl In reality, the mill always contains fines: these fines are present in the ball mill feed and are produced as ,
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Calculations: The critical speed of ball mill is given by, n c = 1 2 π g R − r where R = radius of ball mill; r = radius of ball For R = 1000 mm and r = 50 mm, n c = 307 rpm But the mill is operated at a speed of 15 rpm Therefore, the mill is operated at 100 x 15/307 = 4886 % of critical speed If 100 mm dia balls are replaced by 50 .
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SAG mill High rock charge volumes ie 15 to 20% gave maximum power draw from the mill motor but did not result in greater productivity of the SAG mill The SAG mill total load is currently held at about 25% volume (14% ball charge and 11% rock charge), but has been as high as 32% has long been debated One of the objectives of a review carried .
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The same underlying model is used for SAG and ball milling, with minor differences for the way the charge density is calculated and whether the mill is a grate discharge (most of the SAG mills) or overflow discharge (typically a ball mill) Within the classification, there are also two versions of the Morrell C-model:
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The ball mill accepts the SAG or AG mill product Ball mills give a controlled final grind and produce flotation feed of a uniform size Ball mills tumble iron or steel balls with the ore The balls are initially 5–10 cm diameter but gradually wear away as grinding of the ore proceeds The feed to ball mills (dry basis) is typically 75 vol .
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May 24, 1990· In semi-autogenous grinding (SAG), the grinding mill inventory, (ie 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 two-dimensional graphical method is presented for determining the actual ball charge within ,
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The development of inferential measurement models of SAG mill total charge and ball charge levels, feedrate and size distribution, and, mill discharge rate and size distribution and the further .
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EF5BM=[ P80+103 1145×P80] ( 3 ) The EF4 formula requires both the rod mill and ball mill work index (rod mill Wi is used to calculate the optimal feed size) and because this is a “single-stage ball mill” calculation, the F80 is actually the rod mill feed size (10,000 µm) from Table 1 and the P80 is the ball mill circuit product The EF5 factor only applies below 75 µm to ball
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The SAG Mill is a machine added by Ender IOIt uses Micro Infinity (µI) to grind (or mill) items into their crushed variants, like Ores into DustsThe SAG Mill has four output slots; recipes can have 1-4 different outputs, with different chances of obtaining those outputs Uniquely, the SAG Mill can use Grinding Balls made from various materials to increase energy efficiency ,
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According to available literature, the operating speeds of AG mills are much higher than conventional tumbling mills and are in the range of 80–85% of the critical speed SAG mills of comparable size but containing say 10% ball charge (in addition to the rocks), normally, operate between 70 and 75% of the critical speed
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SAG mill SAG is an acronym for Semi-Autogenous Grinding SAG mills are autogenous mills but 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% The largest SAG mill is 42' (128m) in diameter, powered by a 28 MW (38,000 HP) motor
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