Bond Grinding Circuit Efficiency
2/20/2014 6 Example SAG-Ball Mill Circuit WI Efficiency Calculation • SAG-ball circuit F80 = 165,000 um P80 = 125 um W = 14.6 kWh/t Wlo = 14.6 / [( 10 / SQRT 125) – (10 / SQRT 165,000)] = 16.8 kWh/t
2/20/2014 6 Example SAG-Ball Mill Circuit WI Efficiency Calculation • SAG-ball circuit F80 = 165,000 um P80 = 125 um W = 14.6 kWh/t Wlo = 14.6 / [( 10 / SQRT 125) – (10 / SQRT 165,000)] = 16.8 kWh/t
EF5BM=[ P80+10.3 1.145×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
F80 feed size to the SAG mill, the final grind size and an estimate of the transfer size between the two mills. This methodology was incorporated into a computer-based program for the sizing
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. Looking for speed & feed calculators and recommendations for your Dapra tooling?
based on the calculation of the overall potential and kinetic ener-gy of the ball charge during its motion inside the rotating mill. The concluding section of the article offers empirical formulas to calculate idling and aggregate capacity of the mill main drive. Key word: semiautogenous milling, modeling, strength pro-
equal mill feed rate, and the mill must be set up to easily accept gravel from the equipment used for material transportation. Most of the information contained in the following pages is based on average operating parameters and performance data for the various types of equipment used in placer min- ing.
(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.
Formula (5) is used in making tabulations for mill use. As used in these formulas the specific gravity of the ore is obtained simply by weighing a liter of mill pulp, then drying and weighing the ore. With these two weights formula (2) may be used to obtain K, and then formula (1) to convert to S, the specific gravity.
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. The % loading or change volume can then be read off the graph below or approximated from the equation and calculation: % Steel Charge Loading in Mill = 113 – 126 H/ D
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 ...
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
Mill Speed - Critical Speed. Mill Speed . No matter how large or small a mill, ball mill, ceramic lined mill, pebble mill, jar mill or laboratory jar rolling mill, its rotational speed is important to proper and efficient mill operation. Too low a speed and little energy is imparted on the product.
Sag (mm): --. SAG= R−√R2 −(D 2)2 SAG = R − R 2 − ( D 2) 2. R. Radius of Curvature.
3.5.2.2 Ball Mills. 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 Sag of Parabola When Uniform Load is Known is the vertical deflection caused in the steel due to only end supports in the beam or the considered member is calculated using sag_of_cable = Uniform load * Span length ^2/(8* Prestressing force).To calculate Sag of Parabola When Uniform Load is Known, you need Uniform load (w b), Span length (L) and Prestressing force (F).
Rim and face method - by calculation 38.. Reverse indicator method - by calculation 41.. Indicator bracket sag measurement 43 Alignment by Laser 45.. Basic operation requirements 48 Laser alignment case study .. Laser alignment cuts energy costs 52.. Laser alignment improves pump reliability 56
The Sagulator computes initial sag only. As an engineering rule of thumb, wood beams/shelves will sag an additional 50% over time beyond the initial deflection induced by the load. Thus, a suggested target for allowable sag is 0.02″ per foot or less. 3.
Internet-based calculations and energy models for mineral comminution. Sagmilling.com is home to a collection of both free and subscription-based calculation tools to aid metallurgical process engineers perform comminution calculations. Grinding circuit design tools, including for SAG mill-ball mill circuits, and geometallurgy energy models are ...
SAG Mill Circuit Example — Gold Processing SAG mill circuit example for gold processing [image: (135-6-3)] AG/SAG Mill. AG/SAG mills are normally used to grind run-off-mine ore or primary crusher product. Wet grinding in an AG/SAG mill is accomplished in a slurry of 50 to 80 percent solids. 2D and 3D simulations of particles in a SAG Mill
Equation 2. The approach requires the feed size to the SAG, the SAG mill product size (transfer size) and the final product size. The prediction of the SAG mill transfer size used in the formula is made by comparison with pilotplant data and operating plant data for similar ore types (Barratt, 1989). The
This video shows how to calculate Volume of a SAG Mill using GEOMAGIC DESIGN X in under 6 minutes from start to finish.Alignment: Local Based on Pick Point &...
calculations by the user. If the mill has cone ends the model automatically calculates the volume of the cone ends as well as the volume of balls/rock in the cone ends from the cylindrical section data that the user inputs. In SAG mills the total filling relates to the combined rock and ball volume (including voids),
A related formula can be used to calculate the height of the arch at any point - not just in the center. This formula can be used by those that want to build a dish by routing out a board to different depths for example. The first step is to calculate the sagitta s for the arc based on the radius r and the span l. Use the first calculator ...
This is an example calculation for sag and tension in the transmission line. You may opt to review first the fundamental principles and formulas from this post.. The foregoing calculation is based on the linear cable model on which plastic elongations are ignored. Also, the loading of the conductors is based on the National Electrical Safety Code 2017.
Sag Mill Recirculating Load Rate Protable Plant » gear drive sag mill vs gearless drive sag mill » ball mill and sag mill liner manufacturer gauteng jhb » calculation of recirculation load on a …
Mill Filling Calculation Example #1: Suppose during a crash stop of a 30' SAG mill with 48 rows of shell lifters, that between 28 and 29 rows of lifters are exposed. Nt = 48 rows Ns = 28.5 rows Nh = 19.5 rows Volume of the charge = 31.8% Example #2: Suppose after a …
Steel wear calculation. The Bond Abrasion Index is a measure of how readily a rock sample will wear away steel that comes into contact with it. It is conventionally used to estimate the liner and media wear rate in rod mills, ball mills and crushers. This is a batch test and returns a result in units of grams (the amount of metal that wears off ...
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 99.5% of the …
L = Horizontal distance between the towers i.e. Span. H = Difference in level between the two supports. T = Tension in the conductor. X1 = Horizontal distance of point O from support A. X2 = Horizontal distance of point O from support B. W = Weight per unit length of conductor. From equation (1), Sag S1 = WX12/2T. and Sag S2 = WX22/2T.
SAG and the ball mill circuits (JKMRC, 1996). The phantom cyclone is used to classify the AG/SAG mill product into two products; the phantom cyclone overflow that is similar to the final ball mill product, and the phantom cyclone underflow is then used as an adjusted …