Mar 20, 2020· Ball mill： Ball mills are the most widely used one Rod mill： The rod mill has the highest efficiency when the feed size is

Get PriceSag (mm): -- SAG= R−√R2 −(D 2)2 SAG = R − R 2 − ( D 2) 2 R Radius of Curvature

Get Price21 SAG mill modeling In MODSIM, one of the simulation models used for a SAG mill unit is SAGT (Semi-Autogenous Grinding with Trommel) model In this model, a SAG mill with a trommel screen at mill discharge is modeled using the full population balance including particle attrition and wear (King 2001b) In this

Get PriceWhether you’re talking about SAG or a ball mill, space is a delicate issue, especially in the concentrator That’s why we always design our Gearless mill drives drives to combine maximum performance with limited space , curve A number of measures taken in the closed-loop control

Get PriceExample: Sag Vertical Curve (31 in textbook) A 1600 ft long sag vertical curve (equal tangent) has a PVC at station 120 + 00 and elevation 1500 ft The initial grade is -35% and the final grade is +65% Determine the elevation and stationing of the low point, PVI, and PVT

Get PriceNov 26, 2019· The biggest characteristic of the sag mill is that the crushing ratio is large The particle size of the materials to be ground is 300 ~ 400mm, sometimes even larger, and the minimum particle size of the materials to be discharged can reach 01 mm The calculation shows that the crushing ratio can reach 3000 ~ 4000, while the ball mill’s .

Get PriceDesigning a Curve to Pass Through a Fi d P i tFixed Point • Given: g 1,g 2, VPI station and elevation a point (P)VPI station and elevation, a point (P) elevation and station on the curve • Required: You need five values to design a curve:Required: You need five values to design a curve: g 1,g 2, VPI station and elevation, and curve length The only missing value is the ,

Get Pricevarying it as the mill water addition rate chang Loveday/Barratt Model Brian Loveday published a simple SAG mill model (Loveday, 1978) of the form in Equation 2 The equation uses mill dimensions (inside the liners), the density of the mill charge and an empirical “power number” that encapsulates the mill speed and volumetric filling

Get PriceThus, crest curves must be designed to ensure the crest does not interfere with stopping sight distance Headlight sight distance is the controlling factor in sag vertical curves, though stopping sight distance is used in the actual design of a sag vertical curve Related to sag curves is the issue of undercrossings

Get PriceSingle stage SAG Mills are very beneficial in reducing CAPEX for plants with a staged throughput approach When future tonnage is to be increased, the SAG Mill can feed downstream ball milling to boost capacity Fuller-Traylor SAG/AG Mills range in size from 43m through 122m in diameter with powers as high as 28,000 kW

Get PriceMill Creek (I-95/I -276 Interchange Project – PTC) Complicated horizontal and vertical geometry Sag curve and rollover on bridge Direction of drainage flow difficult to understand 5 MILL CREEK DRAINAGE ANALYSIS Cross Slope Transitions

Get PriceThe calculated cumulative mill revolutions to 80% passing 17 mm is used together with the mass of the SAG mill charge to compute the SAG mill specific pinion energy, as seen below The process to determine the revolutions is done in cycles, with the -17 mm material (fines) removed from the mill after each cycle up to 60% passing 17 mm

Get PriceSAG mill control fundamentally means managing the load in the mill by adjusting the feed rate of ore to the mill and/or manipulating the rotational speed of the mill The best way to measure load is to mount the mill on load cells , • No additional learning curve for operations and maintenance personnel Control strategies implemented in .

Get PriceSingle stage SAG Mills are very beneficial in reducing CAPEX for plants with a staged throughput approach When future tonnage is to be increased, the SAG Mill can feed downstream ball milling to boost capacity Amstar SAG/AG Mills range in size from 43m through 122m in diameter with powers as high as 28,000 kW

Get PriceThe qualitative eﬀect of changes in particle size distributions (PSD) on the SAG mill performance can be addressed by using the grind curv The operation of SAG mills is extremely sensitive to mill ﬁlling; from a qualitative point of view, for a given ﬁll level and

Get PriceDec 16, 2019· Design control for sag vertical curve when S is less than L Safe speed for horizontal curves when V is greater than 50 mph based on "A Policy on Geometric Design of Highways and Streets", 2001 Safe speed for horizontal curves when V is less than or equal to 50 mph Design control for radius of horizontal curve with Sight Obstruction

Get PriceJan 18, 2021· a chosen SAG mill even whenthe y use the same breakage test data Sometimes, different tests are used for mill design, which also provide conflicting results These inconclusive results are unacceptable to the , random at the low energy end of the curve Compared to Fig 2, this is the difference between grinding in

Get PriceHowever, the SAG mill specific energy is calculated using proprietary models and the specific ball milling specific energy is the differential between the SAG mill and total specific energy requirements This method acknowledges the limitations of using the P 80 of the transfer size between the SAG mill and the ball mill

Get PriceThe principal control in the design of sag vertical curves is to ensure that SSD is available for headlight illumination throughout the sag vertical curve Figures 30-2D and 30-2E present K-values for passenger cars assuming h 3 = 20 ft (600 mm) and S = SSD in the basic equation for sag vertical curves (Equation 30-24)

Get Pricemill under steady state then cutting off all feed streams to the mill as it is being stopped Sufficient time is required to obtain all the important measurements correctly during the crash stop The mill filling should be measured at a minimum of 3 points along the mill Excess of slurry could also be estimated To get rid of pulp and rocks in .

Get PriceMay 21, 2019· What is sag curve? Sag vertical curves are curves that connect descending grades, forming a bowl or a sag Designing them is is very similar to the design of crest vertical curv Sag vertical curves are characterized by a positive change in grade, which means that vehicles traveling over sag vertical curves are accelerated upward

Get PriceSAG mill control fundamentally means managing the load in the mill by adjusting the feed rate of ore to the mill and/or manipulating the rotational speed of the mill The best way to measure load is to mount the mill on load cells , • No additional learning curve for operations and maintenance personnel Control strategies implemented in .

Get PriceSag vertical curves are curves that connect descending grades, forming a bowl or a sag Designing them is is very similar to the design of crest vertical curv Once again, the sight distance is the parameter that is normally employed to find the length of the curve When designing a sag vertical curve, however, the

Get PriceIt is the aim of this paper to present an investigation of milling curves as a function of SAG filling The milling curves comprise a throughput curve, ,

Get PriceIn this study the performance of a fixed speed SAG mill was assessed and optimised by employing mill trajectory models and using the JKMRC power model to calculate percent total mill filling Power Curves, which correlate ball filling, mill ,

Get PriceJun 15, 2020· A dynamic non-linear model was fitted to the grind curve data of an industrial semi-autogenous grinding (SAG) mill by means of a step-wise procedure Grind curves give the steady-state values of the performance variables throughput, power draw, and grind in terms of the mill filling and critical mill speed

Get PriceControl 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, MS, van der Westhuizen, AP, & Mainza, AN 2009)

Get PriceDec 01, 2006· When the mill is progressively stepped through a range of one variable, and allowed to reach steady state at each new point, the response of the mill has been named by the authors the ‘grindcurve’ For example, the variable can be mill filling, and the output grindcurves the power, throughput, and P80

Get PriceOct 25, 2018· Experienced SAG mill operators are familiar with the concept that an optimal volumetric mill filling exists, which maximizes the mill throughput rate of a set feed material The grind curve work of Powell and Mainza (2006) and Powell et al (2009) demonstrated that the optimal volumetric mill filling for maximum federate does not necessarily .

Get Price(PDF) Milling curves as a tool for characterising SAG mill

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