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calculate the reduction ratio and the number of milling,the 80% reduction ratio is the ratio of feed and product diameters through which pass 80% of particles in mass (see formula below). r/1=f80/p80 . source: formula.minerallurgy. this method is more practicable and more accurate, especially when sizing a milling machine or when determining the performance of an existing installation..a method of c alculating autogenous/ semi-autogenous,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..grinding mill computer model,morgardshammar/marcy equation. mill diameter inside liners - d d = dshell-0.15 allowance for liners approximate mill diameter is derived from: power =5.*6115 dl24. 6* la= * d where a is the aspect ratio l/d derived from a regression equation on 25 manufacturers' mill size and power relationships for sag mills the equation becomes.
at the lihir gold mine, the plant was utilizing mill’s bearing pressure to calculate load measurement for the sag mill in hgo1 the use of sag mill weight for process control is additionally complicated at lihir by compromised and suddenly drifting load cell and bearing pressure measurements on two of the process plant’s three sag mills.
this equation is the basic control law. as with most predictive control strategies, implementation of the strategy involves calculating the current control output, implementing this new value, waiting one controller update period, and then repeating the calculation. predictive feedforward control can easily be included in this control formulation.
ag/sag mill is inefficient in grinding particles of a certain size, typically in the range of 25-55 mm, i.e., pebbles. therefore, cone crushers are often used as pebble crushers and integrated into ag/sag mill circuits to break the critical size particles that accumulate in the mill and to increase the performance of the primary grinding circuits.
power calculation formula of ball mill acbeth. how to calculate power consumption in ball mill . ball mill design/power calculation. 2 · the ball mill motor power requirement calculated above as 1400 hp is the power that must be applied at the mill drive in order to grind
ball mill power calculation example 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
an 8 m diameter sag mill with lid = 0.5 grinding a copper ore, and predicted maximum capacity and minimum kwh/ton at about 6070 ball load at 25070 total filling. two fag mills of lid = 2 were necessary to give the same capacity, and the simulations indicated a lower kwh/ton for these mills. for this ore, both systems were technically feasible.
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calculate rpm, ipm, sfm, ipt and more. below are variable abbreviations and formulas for many common milling operations. click here to download a printable pdf file containing these formulas.
calculation of sag and tension in transmission line depend on the span of the conductor. span having equal level supports is called level span, whereas when the level of the supports is not at an equal level is known as unequal level span. the calculation of conductor at an equal level shown below.
h = different in levels between two supports. x1 = distance of support at higher level a from & point o. x2 = distance of support at higher level i.e b from o. t = tension in conductor, w = wight per unit length of the conductor. after getting x 1 & x 2 value, the sag of conductor is easily calculated.
advanced simulation for semi-autogenous mill s ystems: a simplified models approach 149 for large-scale mills, the pulp discharge flow can be determined by combining equations (4) and (5) as follows: m q d= j (8) the calculation procedure can be transformed in an iterative numerical sequence.
(2) from the calculation results by the methods of the perfect solution of parabola theory, the improved simplified formula i and ii, the finding “the smaller the sag-span ratio, the faster the sag variation in midspan with the change of cable length” is right only in a certain range of sag-span ratio.
mines (wa) 36ft sag mill the number of outer head liners was reduced from 36 to 18 pieces and in doing so reduced the time to replace them by 9 hours at a cost downtime saving of about u$25,000 per hour. in this case the liners sections are 3.5 t each. for smaller mills the liners have to be handled and installed manually, so smaller blocks with
the formula for maximum sag in the towline is given by below: since all parameters except t 0 are fixed, we can vary t 0 to see how it affects the maximum sag. the minimum tension is for the case when the towline is just hanging under its own weight, and the maximum tension shall be when the towline tension is equal to the maximum bollard pull of the tug.
energies article operation analysis of a sag mill under di erent conditions based on dem and breakage energy method qiyue xie 1, caifengyao zhong 2, daifei liu 1,*, qiang fu 1, xiaoli wang 3 and zhongli shen 1 1 school of electrical & information engineering, changsha university of science & technology, changsha 410114, china; [email protected] (q.x.); [email protected] (q.f.);
full sag mill (11.5m x 8.1m) involving over a million elements. it is significant that as recently as january 2001 it was anticipated by many investigators in this field that full mill simulations involving such a large number of particles would not be practical for several years.
sag-tension calculations: refinements and enhancements made by trimble energy solutions by: jacques hamian and yair berenstein abstract sag-tension programs have traditionally calculated the conductor’s sag-tension characteristics using the alcoa graphic method. by refining the input used in this equation, and augmenting
the following formula can be used in production, in order to estimate the weight of coils in production starting from their geometry. the calculation is pretty simple. it starts calculating the
the diagram below will help to visualize the quantities involved and their relationship to each other. the circular arc is in red and is of radius r.the chord (span) connecting the ends of the arc is divided in half, and that is labeled l in the diagram. finally the sagitta, the displacement or deflection of the highest point of the arc from the mid point of the chord is labeled s.
use these pages to calculate the mill feed and discharge settings of a milling train. the method of calculation is shown here.. once you have entered the data below and clicked the submit button a second input page will appear where you can adjust the input data for each individual mill.
control of -semiautogenous grinding(sag) mill weight is an example of an important process that exhibits many of these aspects. maintaining the sag mill weight at the optimum value is critical for achieving maximum grind rate efficiency and mill production (powell, m.s., van der westhuizen, a.p., & mainza, a.n. 2009).
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