Boom

The paper will compare the survey database to SAG mill models by Austin, Morrell and Hogg & Fuerstenau with the purpose of demonstrating the degree of fit of the models to surveys and...

SAG mill, power model, power draw, Austin model, Morrell C-model, Hogg & Fuerstenau model This work was originally published as Paper № 123 in the XXVIII International Mineral Process Congress ...

3. SAG mill fractional total filling, J t, fractional ball filling, J b, and fractional rock charge filling, Jr, ( J r = J t − J b); 4. SAG mill total feed; 5. Oversize crusher product and primary cyclone underflow; and, 6. SAG mill fresh feed, including the feed sizes ( F 80. . . F 20). Step 1: Oversize Crusher Feed, Primary Cyclone Feed and ...

SAG Mill, El Soldado Operation, Anglo American To perform the estimation of total load filling level (Jc), the C-Morrell'sModel (Morrell, 1993) for estimating the power of a SAG mill was used ...

The author has developed a simple and sound approach to determine the preliminary SSSAG mill aspect ratio before conducting population balance model simulations. The approach developed takes into ...

the ball filling estimation of Miduk semi-autogenous (SAG) Mill via an utilized method. Miduk SAG Mill circuit is shown in Figure 1. Figure 1: Diagram of Miduk Copper Complex SAG Mill Methods The following methods were utilized in this research work for ball filling calculation. To fulfill this aim, three approaches were investigated.

The method can be applied for any kind of synchronous mill motor.Results of an actual application are presented, namely for a 15 000 Hp SAG mill showing a good correlation with the filling ...

can improve and optimise SAG mill grinding performances via real-time monitoring technology [15]. 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) [16–28]. Notwithstanding, more accurate and precise prediction is a topical …

sag mill estimation hogg - marche-contre-monsanto.ch. Pam Hogg 2013/14 _ 201349ensp;0183;ensp;Pam Hogg 2013/14,Pam Hogg 2013/14,Pam Hogg 2013/14 . Mill Filling Prediction tool addresses productivity . 42ensp;0183;ensp;SAG mills are a key asset for mineral processing operations as one of the critical stages of extracting mineral out of …

Power draw estimation plays a vital role in sizing, control and optimization of grinding mills. ... This work starts with Hogg-Fuerstenau Power Model and shows how this model successfully predicted the power draw of many grinding mills in several mining operations and describes the discrete element model and how it overcame the issues …

A commercial software product was installed to estimate ve states (mill hold- The contribution of the work reported here is to up of two rock states ( 55 mm), water, grinding balls present further examples of state estimation for SAG and shell liner weight) and two parameter estimates (ore mills and novel models of the SAG mill discharge, SAG ...

The empirical equation by Hogg and Fuerstenau, although formulated on a simple concept of charge being lifted from the toe to the shoulder of the mill, predicts …

Power drawn at the pinion is 448 kW, 13.617 kWh/tonne (SAG mill) and 570 kW, 17.325 kWh/tonne (ball mill) when processing 32.9 mtph, for a total of 30.942 kWh/tonne or 14.6% above the conventional estimate. A ball charge volume which is lower than those tested has been selected in order to minimize wear.

The Morrell C-model is generally regarded as one of the most accurate tumbling mill power-draw models and is ideally suited for this application of estimating fill levels of the SAG mill in real time.

Prediction of correct sag mill power consumption with a change in ore hardness, solid percent (density) to the sag feed, rpm of sag and PSD has always been very tricky. So …

TABLE 1 Comparison of RoM and SAG mill operating regimes AG/SAG South African RoM Speed, % critical 70- 80% 75 -90% Charge Filling, % total mill volume 20 - 30% 35 - 45% Bali filling, % total mill volume 4-15% 15 - 35% Internallength 3-5m 5 -12m Aspect ratio, diameter/length 0.7 -2 0.5 - 0.8 Recycle stream Trommel oversize Cyclone underflow ...

Contribute to changjiangsx/sbm development by creating an account on GitHub.

The Net Power Demand of a SAG mill may be well estimated by the simple Hogg and Fuerstenau Model ("Power Relations for Tumbling Mills", Trans. SME-AIME, Vol. 252, pp. 418-432, 1972), here expanded from its original formulation to represent the independent contribution of each component of the mill charge (balls, rocks and slurry) to the ...

Rock 'breakage variability' is quantified in terms of A × b for 6.25%, 25%, 50%, 75% and 93.75% percentile curves. •. Simulations using JKSimMet provided some …

For SAG mill 1, the information is split into 179, 71, and 90 days (8600, 3400, 4340 data points), while for SAG mill 2 the information is split into 166, 66, and 99 days (7953, 3181, 4771 data points) for the train, validation, and testing datasets, respectively. ... We observe that for SAG mill 1 there is a slight over estimation of the ...

This paper expands the SAG mill survey database published by the Author at Procemin 2013. The new database includes 49 published SAG/AG mill surveys and includes mills from all over the world. The paper will compare the survey database to SAG mill models by Austin, Morrell and Hogg & Fuerstenau

Fig. 1 depicts a gearless mil drive, where the mechanical power is transferred electromagnetically between the stator and poles of the rotor (Errath et al., 2003).Due to the mass flow, materials, and power involved in the process, SAG mills face the problem of high-energy impacts caused by steel balls cataracting against the shell of the mill, with …

Among the different grinding processes, Autogenous (AG) and Semi-Autogenous (SAG) mills are widely used for ore size reduction. The main difference between these two mills is the use of steel balls as grinding media, typically in the order of 6–12% in volume (Sbarbaro et al., 2005), in the SAG mills. With the addition of grinding …

MONSAG is a system for estimating the load filling of a SAG mill (patent pending). It is based on the robust measurements of the electrical variables of the motor Fig. 4 shows the application in a gearless drive mill Fig. 5 depicts the application with a LCI drive. Ore lumps, steel balls and slurry comprise the internal load of the mill and ...

Two validations are carried out with industrial grind out data for a 36-foot SAG mill and the correlation coefficient obtained was 0. 718 with average daily data and 0.996 with crash stop data. 2

In Fig. 3, Fig. 4 the data is presented in order to show the effect of the fresh feed size, particularly the % −6″ +1″ (−152 +25 mm), on the SAG mill power consumption (Pc) in kW and on the SAG mill specific energy consumption (Ecs) in kW h/t, obtained by dividing the power consumed (kW) by the fresh feed rate (t/h).

The fractional mill filling and mill rotating speed were considered as the variable input parameters. Based on this, a separate model was developed for each ball size distribution proposed by Bond, which can be used to calculate the apparent charge density in ball mill settings and typical ball mill operating conditions.

The developed model shows the advantage of grouping all size reduction mechanisms in a single function, "K i," all internal classification processes in "c i " and pulp transport inside the mill through the P*/W ratio. Based on results obtained at pilot and laboratory scale, the estimation of both functions is possible considering a system in …

SAG MILL POWER ESTIMATION Hogg & Fuerstenau Model Mill Slurry Filling,% Volume, Ball O´size Interstitial Density Apparent Mill Charge Weight, tons About the Mill Power_SAG Mills Spreadsheet ... Power, kW Mill Speed rpm Eff. Diameter Eff. Length Moly-Cop Tools TM (Version 2.0) Base Case Example : 36'f x 17' SAG Mill. Moly-Cop …

I know of a practice that uses 50 percent of the theoretical consumption calculated by the Bond formula for ball mills; for SAG Mills 65 percent of the theoretical consumption is used considering the SAG mill as a ball mill.The rotating paddle used in the Bond Ai test is made of SAE4325 steel hardened to 500 Brinell and therefore not ...

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.

• Jx is the mill filling of component x, as a fraction of total mill volume (e.g. 0.3 for 30%) • L is the mill effective grinding length, m • P is the power evolved at the mill shell, kW • wC is the charge %solids, fraction by weight (e.g. 0.80 for 80%)

tumbling mill power draw models (Bond, 1962, Hogg and Fuerstenau, 1972, Arbiter and Harris, 1982, Austin, 1990). This is that the models used the charge shape shown in Figure 1 ... where slurry was contained within the grinding charge as in a typical grate discharge AG/SAG mill (Figure 2a) or where it additionally formed a large slurry pool as ...

Under estimation of the capacity of the crushing and/or grinding circuit. Whilst downstream limitations, such as concentrate or tailings handling capacity occur ... P a g e SAG mills. The design SAG mill specific energy was calculated on the basis of the pilot plant results, supported by analysis of the bench-scale test work. Estimates of SAG ...

To perform the estimation of the total load filling level (Jc), Morrell's C-Model (Morrell, 1993) for estimating the power of a SAG mill was used, which was calibrated by FARO laser...

Abstract. In this study, the relationship between acoustic emissions and hardness of different rock types (model quartz, model calcite, and real iron ore) coupled with binary mix ratios of model quartz and iron ore (1:3, 1:1 and 3:1) was investigated in a laboratory-based AG/SAG mill. The acoustic emission response and sensitivity of the …

The rRMSE and correlation coefficient of multilayer perceptron models are stable between 4 and 200 hidden units but beyond these metrics present strong …

The operations of AG/SAG mills are known to be sensitive to the changes in feed particle size distributions presented to the mill [].The variation of feed particle size significantly affects the overall process control, product quality, and economic performance of the mill [2,3,4].Poor product quality from the AG/SAG mill poses significant …

To predict the power of the SAG mill, Hoseinian et al. proposed an analytical model based on gene expression programming. To develop their model, they employed several tests by varying the SAG mill parameters such as the moisture of charge, mass flow rate, cell weight of mill load, solid percentage and inlet and outlet water to the SAG mill.