meaning of ser on sag mills

Semi-autogenous grinding (SAG) mill liner design and …

Semi-autogenous grinding mills (SAG mills) are tumbling mills that most commonly have a shell diameter-to-length ratio of around two. With this high aspect ratio, SAG mills …Web

SAG Mill Grinding Circuit Design

Common convention generally refers to high-aspect ratio mills as SAG mills (with diameter to effective grinding length ratios of 3:1 to 1:1), low-aspect ratio mills …Web

SAG Mill Variable Speed Drive

SAG Mill Variable Speed Drive. Large scale equipment can reduce both capital and operating costs for concentrators. Large semiautogenous mills can be effectively utilized in big mills but they must be kept fully loaded to take advantage of their great potential. With varying hardness ores, controlling throughput is difficult and careful design ...Web

Machine Learning and Deep Learning Methods in Mining

Semi-autogenous grinding mills play a critical role in the processing stage of many mining operations. They are also one of the most intensive energy consumers of the entire process. Current forecasting techniques of energy consumption base their inferences on feeding ore mineralogical features, SAG dimensions, and operational variables. …Web

BOND'S WORK INDEX: WHAT IT IS AND WHAT IT ISN'T

things. It is incorrect to say, for example, "the ball mill work index is 13 kWh/t and the SAG mill SEC is 5 kWh/t, so the total circuit energy is 18 kWh/t." This example is a real discussion that one of the authors had with a flotation engineer who was confused because of the convention of using the same units for both quantities.Web

Mill drive selection for semiautogenous grinding mills

Early SAG mill designs using gear drives were limited in the amount of power that could be applied to the pin-ions, 3.7 MPa (5000 hp). The exception to this design was the Hibbing taconite operation. It used two4.47 MPa (6000 hp) motors to drive a 1I-m-diam x 4.5-m long (36-ft-diam x 15 ft) autogenous mill. However, recent SAG mill designs now ...Web

(PDF) Autogenous and Semi-Autogenous Mills, 2015 Update

Mill designs are of f the shelf tod ay for a SAG mill of up to 28 MW followed by t wo Ball Mills o f up to 24 MW. It is possible to have a single processing line c apable of handling over 200,000 ...Web

Mill drive selection for semiautogenous grinding mills

Early SAG mill designs using gear drives were limited in the amount of power that could be applied to the pin-ions, 3.7 MPa (5000 hp). The exception to this design was the Hibbing …Web

PARAMETER OPTIMIZATION OF LARGE SAG MILL LINER …

Due to its strong lifting capacity and excellent grinding performance, the trapezoidal liner is widely used in the SAG mill. The structure of the trapezoidal liner is shown in Fig. 1, the main dimensions are: dip angle (tau), length of the top edge (L) and height (h).Dip angle (tau) determines the trajectory of the mediums in the SAG mill, …Web

ITP Mining: Improving Energy Efficiency in SAG Mills

Gold Mines around the plant-scale SAG mills. This will be done in order to collect the operational data necessary to simulate in the pilot mill. The result will optimize the performance of SAG mills and increase its energy efficienc y. The pilot mill will be operated with sample ore/ slurry from participating mine sites.Web

Getting the Most From Milling Operations | E & MJ

SAG mills grind ore by lifting it and a small amount of grinding media and dropping it inside a horizontal mill. Ball mills are smaller and use a higher concentration of iron balls to pummel the ore. The mills can operate in an open grinding circuit, feeding secondary grinding systems, or in a closed circuit generating a fine product. ...Web

SAG Mill Components

SAG Mill Components. Once the basic operating conditions have been defined for the mill designer then, and only then, can he begin taking into account shell and head stresses and trunnion bearing sizes …Web

What's the Difference Between SAG Mill and Ball Mill

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 0.1 mm. The calculation shows that the crushing ratio can reach 3000 ~ 4000, while the ball mill's ...Web

SAG Mill Testing

involves replacing the mill charge several times throughout the test. The Bond tests are typically run for a minimum of seven cycles, while the MacPherson and pilot plant tests are operated for about 6-10 hours. The achievement of steady-state is desirable in a grinding test, because harder components may build up over time. For AG/SAG mills,Web

How the Modern SER Drive boosts grinding performance

The CSE Uniserve Modern SER Drive is a compact, powerful, multi-functional and reliable addition to other SAG mill control technologies on the market today. Electrical features The CSE Uniserve Modern SER is …Web

Optimal Speed Control for a Semi-Autogenous Mill Based on

A SAG mill has low speed and heavy load, which cause the energy consumption of grinding operation to be very high. It accounts for a large proportion of the electrical consumption across the plant . The rotation speed is an important factor related to the operation and grinding efficiency of the mill. Under the traditional operating …Web

Semi-Autogeonous (SAG) Mill Overload Forecasting

Abstract. In mining, the detection of overload conditions in SAG mills is of great relevance to guarantee their operational continuity due to their economic and environmental impact. Various authors have tried to use Machine Learning techniques to identify the relationship between the variables and the underlying overload phenomenon.Web

How the Modern SER Drive boosts grinding performance

Autogenous Grinding & Semi Autogenous Grinding Circuits

Autogenous grinding is favored when the ore is quite competent and a fine grind is required. Semi-autogenous grinding is applied when fine crushing could cause …Web

Choosing a SAG Mill To Achieve Design Performance

sized SAG mill may prevent production losses that would be many times greater over the extended start up period. This is the direct result of choosing the proper …Web

AG

Mill, gear and pinion friction multiplier: 1.025. Mill Power required at pinionshaft = (240 x 16.5 x 1.025) ÷ 0.746 = 5440 Hp. Speed reducer efficiency: 98%. 5440 Hp ÷ 0.98 = 5550 HP (required minimum motor output power). Therefore select a mill to draw at least 5440 Hp at the pinionshaft.Web

'SER' – Slip Energy Recovery Grinding Mill Speed Control

With our SAG mill running at 65.4% critical speed (mill @ 8.7 RPM), the SER motor speed reference is 850 RPM or 85% of 1000 RPM. We are recovering approximately 1.2 MW of slip energy; the power ...Web

SAG Mill Optimization using Model Predictive Control

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).Web

Operation Analysis of a SAG Mill under Different Conditions …

SAG mill depends on the simulation time (mill actual working time) and the limitation of the rated power. The mill speed, fill level ratio, and steel ball ratio can significantly affect mill operation, and ... The indispensable technical mean in mineral processing, i.e., grinding technology, is widely used in metallurgy, chemical industry, and ...Web

Sag Mill Maintenance

Sag Mill Maintenance. Minding the Grind: Maintenance Options to Keep SAG Mills Turning When the largest machine in the plant stops working, the silence that follows typically isn't golden – just expensive By Russell A. Carter, Contributing Editor. Purpose-built structures such as the Skyway system from Russell Mineral Equipment can provide ...Web

Autogenous and Semi-autogenous Grinding Circuits

mill feed instead of the AG/SAG mill. It boosts the throughput of the AG/SAG mill (because there is no recycle), but loads the ball mills instead. Often an existing plant that observes their SAG mill is limiting throughput, but the ball mills are under-loaded can open-circuit the primary mill to better balance the grinding loadWeb

SAG Mill Testing

involves replacing the mill charge several times throughout the test. The Bond tests are typically run for a minimum of seven cycles, while the MacPherson and pilot plant tests …Web

Modelling SAG milling power and specific energy

SAG mill power consumption (Pc) in kW, in 4 grinding circuits (GC1 to GC4) ... (Jb) in the SAG mills as a mean to increase productivity (in most cases Jb of 12–19% are actually used). Of course the mill power is a limit for doing so. The power model presented in this paper (Eq.Web

Developments in the understanding of South African style SAG mills

A case study of evaluating the variance of semi-autogenous (SAG) power draw in a grinding circuit is presented as well. Using Monte Carlo simulation showed that the mean power draw of the Sarcheshmeh SAG mill is about 9349.75 kW with a standard deviation of 983.2 kW, with the highest frequency occurring between 9058.5 and ...Web

'SER' – Slip Energy Recovery Grinding Mill Speed Control

Figure 1. - View of a SAG and Ball Mill A couple of standard drive options are available for controlling the speed of a grinding mill, the gearless mill drive (wrap-around motor) with...Web