The mill was converted from a ball mill duty to SAG mill, so has a low aspect ratio (diameter/length) which changes its operation relative to typical high aspect mills (Powell, Morrell and ...

Fuller-Traylor SAG/AG Mills range in size from 4.3m through 12.2m in diameter with powers as high as 28,000 kW. Our team of product engineers continually improves SAG/AG Mill designs in order to provide the most …

ball mills. These characteristics make SAG mills an excellent example of critical equipments whose continuous and stable operation is essential to guarantee mineral processing plant profitability [1]. To achieve improvements in the production capacity and energy efficiency of an industrial tubular ball mill, some

The successful application of modelling and simulation in design and optimisation rests heavily on having a model which is lifelike. In the case of autogenous (AG) and semi-autogenous (SAG) mills this has provided a significant challenge to modellers, due in part to the interaction between feed characteristics and mill …

This guide will refer to the two most common varieties: Semi-autogenous (SAG) and ball mills. Key considerations. Numerous factors must be considered when selecting a mill liner design, including required grinding action, mill size as well as ore and grinding media characteristics, among others.

A grinding mill model based on discrete element method (DEM) simulations is being developed at Outotec Oyj (Finland) to be used in mill design optimization. The model can be used for many purposes; one example is the selection of the lining and the size of the mill to meet the requirements of the clients.

SAG mill speed may be varied automatically between 65 and 73% of critical by the use of a liquid rheostat arrangement. Measured variables include new feed rate …

Simulation results under the ∅5250 × 500 mm mill model show that the mill operates with the optimal effect when the mill is under the condition of 80% critical speed and 15% fill level; the ...

the required SAG comminution of test ore material. Specific energy consumption (SEC) measured in kWh/t is a ratio of the mill drive power to the milling circuit output, without regard to circulating load. At the constant size of the cycle feed and discharge, SEC is a prime characteristic of material grindability in a certain ore pretreatment ...

Application of the proposed method in a 9.75 × 4.88 m SAG mill indicated that the liner wear profile along the liner length is non-uniform and the highest wear occurs between 1.25 m and 2.75 m of the mill length. The liners of the first half of the mill from the feed end showed more wear (19.1 g/t) compared to that of the second half (17.1 g/t).

The JKMRC has been studying and modelling industrial AG and SAG mills for over 40 years, but the ability to simulate the effects of blending hard and soft components on mill performance remains quite limited.In an effort to quantify these effects for modelling purposes, a series of laboratory, pilot scale and full scale tests, using multi-component …

SAG mills are the largest type tumbling mills used ... Finally, the electromechanical characteristics of the SAG mill are analysed, and the results show that the fluctuation of motor load torque, current, and SAG mill speed in the start-up stage is much larger than that in the stable running stage. The fraction of critical speed and the …

The prototype mill has its front side made of transparent glass in order to be able to visually examine the behaviour of the ball batch while the mill is rotating. The idea behind this type of arrangement is to create an exact model of the prototype mill for the DEM simulator and then compare the results while running the simulator and the ...

The new measurement technique is demonstrated by surveying the load of a large SAG mill following a crash stop and a subsequent grind-out. The SAG mill in this example has an internal diameter of 11.93 m; a belly length inside liners of 6.09 m; cone angles of 15 degrees and a trunnion diameter of 2.80 m.

variations in unmeasured ore properties, material transport delays, and nonlinear response characteristics. 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

In addition, the measurement of vibration-acoustic emission signals has emerged as a promising tool to understand the state of the mill (AG/SAG mill and ball mills) [16] [17][18][19][20][21][22 ...

2. Background. The SAG grinding process has been modeled by various authors, either generating explanatory models of the grinding process, with the aim of modeling, simulating, and optimizing the individual process, as well as integrating it into aggregate processes, such as the mine-to-mill (M2M) paradigm, a practice that has …

These SAG milling plants (Fig. 1) are designed with few pieces of equipment having a large processing capacity, replacing advantageously a large battery of traditional crushers and rod and ball mills.These characteristics make SAG mills an excellent example of critical equipments whose continuous and stable operation is essential to …

SAG mill can be applied as the first stage grinding equipment. It can effectively avoid the occurrence of sliming phenomenon, and avoid further grinding of fine particles. It can play a good role in controlling granularity and energy saving. Advantage of SAG Mill. Infrastructure investment and equipment cost is lower than common process;

Delboni (1999), after developing a new AG/SAG mill model that describes the influence of mill charge composition on breakage performance, recommended investigating multi-component ore interactions ...

The purpose of the primary crusher is to reduce the ROM ore to a size amenable for feeding the secondary crusher or the SAG mill grinding circuit. The ratio of reduction through a primary crusher can be up to about 8:1. …

AG/SAG mills are used in primary milling applications but achieve both coarse particle breakage and fines production—relative to conventional crushing circuits, the product of AG/SAG circuits typically generate more fines. HPGRs are most typically used as a stage of comminution, but have been broadly employed many different stages: tertiary ...

The DEM and erosion model SIEM were used to predict wear within the SAG mill. The simulation results of the standard case (the rotation speed is 10.5 rpm; the angle of the lifter face is 14°; the lifter height is 152 mm) are quantitively validated against the corresponding experimental data [6], and the effects of the rotation speed and lifter ...

The effect of ore characteristics on the particle shape were studied using two detailed industrial surveys to monitor breakage events taking place inside industrial Semi-Autogenous (SAG) mills as ...

Abstract. The present study investigates the propensity of predicting ore grindability characteristics and varying pulp densities through acoustic measurements on the Magotteaux ball mill. Specifically, the grinding behaviour of two different mill feeds (model quartz and iron ore) together with solid loadings (50, 57, and 67 wt% solids) were ...

Capacity: 0.65-615t/h Output size: 0.074-0.89mm Applications: It is commonly used in the mineral processing industry and ferrous and non-ferrous metal ore and nonmetal ore processing plants. It can also be …

Single stage AG/SAG milling. AG/SAG mills as a primary grinding stage in a circuit with or without additional stages of comminution. Inclusion of pebble-crushing circuits in the AG/SAG circuit. Circuits …

For SAG mills, which have broader and more continuous particle size distributions, assumptions about the spatial distribution of unresolved finer particles are a larger problem. ... it has the capability to predict size reduction in response to changes in the ball mill feed breakage characteristics and the operation-related specific energy ...

SAG Mill Components. Once the basic operating conditions have been defined for the mill designer then, and only then, can he …

> Mill throughput and efficiency gains are iterative over time > Mill trajectory modelling based on bar heights, angles, spacing and speed is very predictive > Field trials are the acid test - operator, designer and vendor > Optimisation strategy: – Maximise impact grinding AG/SAG mills – Avoid impact on the shell rather the toe of the charge