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SABC-B circuit •Primary SAG (or AG) in open circuit with pebble crusher. This pebble crushing arrangement sends crushed pebbles to the ball 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
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AN UPDATED DATA SET FOR SAG MILL POWER MODEL CALIBRATION *A. G. Doll SAGMILLING Logan Lake, Canada ABSTRACT 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
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Figure 2 shows the throughput versus SAG mill load for two different liner designs and operating loads, and the power draw versus SAG mill load for the Cadia SAG mill (Hart et al., 2001). Both ...
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Based on experience, mill-liner designs have moved toward more open-shell lifter spacing, increased pulp lifter volumetric capacity, and a grate design to facilitate maximizing both pebble-crushing circuit utilization and SAG mill capacity. As a guideline, mill throughput is maximized with shell lifters between ratios of 2.5:1 and 5.0:1.
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The purpose of this paper is therefore to examine the use of SAGDesign technology as a valid method for determining the chamber size and power required for new AGB, SAB …
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To determine if a SAG mill is operating within the generally established guidelines for a large diameter to length ratio SAG mill, the mill performance can be modeled mathematically. A generalized SAG mill power draw equation developed by Austin, is given by: where the parameters used in the model are defined as: mp= net …
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At Minera Los Pelambres, its concentrator plant has a SAG-Ball grinding circuit, which continuously presents problems of pulp leaks in its SAG mills. This is probably generated by two factors; liner wear and/or microfractures in the fastening system.
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A plant has four crushing stages before the material is fed into the milling circuit comprising a SAG and a Ball mill. The feed size to the first crusher is 80% passing 1,500mm with a reduction ratio of 2. The reduction ratios of the four crushing stages and that of the SAG mill are 4,5.5, 2.5, 1.8 and 1.9 respectively.
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grinding circuit that also takes into account non-ore related influences e.g., equipment size, speed, ball load tc. ... the "variable rates" AG/SAG mill model in JKSimMet is to be used (Morrell and Morrison,1996) the laboratory test has to generate an A and b value, or if a Bond equation is utilised the appropriate Bond ...
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or some other design point, based on what is achievable to feed the SAG mill considering the mining method. Mine design is an important part of SAG mill design. 80 th Percentile Design: Recommended design point for most new plants. Typically the SAG mill will be 10 to 15% larger (more power) than an average ore design. Other design points
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SAG Mill power draw models are used in mill design and grinding circuit modelling to predict how much power will be consumed by a particular mill geometry and operating …
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The SAG mill–pebble crushing circuit closed configuration is referred to as SAC, while the opencircuit configuration is SAC-A. Twelve AG/SAG tests were conducted according to different configurations and …
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For AG/SAG mill circuit selection piloting is still regarded as being the best option for estimating what the performance of the full-scale circuit will be. Tests are normally conducted under a range of conditions, the choice of circuit then being made on the basis of a number of criteria, which normally
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Full Scale Test Circuit. Based upon the results of the pilot plant test work, a decision was made to conduct a full scale test in 1990 utilizing one of the ten (10) primary mill lines at the National Steel Pellet Plant. Primary Mill Line No. 10 would be converted to a fully autogenous grinding mill with pebble extraction and crushing.
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to be used to predict the SAG mill circuit and ball mill circuit specific energies it is important to ascertain: 1. whether the transfer distributions obey the parallel conditions 2. what the appropriate T80 value should be for a given ore type, circuit configuration, mill geometry and operating condition 10 100 0.01 0.1 1 10 100 1000 size (mm)
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What's the Difference Between SAG Mill and Ball Mill
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work is required for a low risk SAG mill design. The concepts presented in that paper have not been challenged or changed since then, except for comments from the floor, where it was suggested that SAGDesign and full JK Dropweight testing were not the only methodologies that could be used alone to design a SAG mill circuit.
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A linkedin group was recently discussing this by asking: I've tried to estimate AG/SAG Mill power requirements using several different methods: (1) Using the results of SMC data (2) Using SAG Power Index (SPI) data (3) Using the 1989 Barratt method updated on Alex Doll's Web site (February 16, 2015) (3) Using Don Burgess' …
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An industrial example of its use is for the problem of SAG mill feed rate control, shown in Figure 12, which is notoriously difficult for a PID controller due to the long dead time. Figure 13 shows the results of on/off testing comparing Dahlin and PID control. Jean Rasczak. 9 years ago. Jean Rasczak 9 years ago.
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Each low aspect ratio (D/L) SAG mill has a diameter of 16 ft, length of 24 ft, installed power of 2 MW and operate in closed circuit with hydrocyclones (750 mm of diameter) to achieve a target ...
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In a ball mill circuit, the "output" can be defined as the production rate of fines of the circuit. As for any output, ball mill circuit output is a function of both its inputs and efficiencies. There are two "inputs" to a ball mill circuit: the ore fed to the circuit and the power delivered by the grinding mill.
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Figure 2, on the other hand, shows the total observed power for the grinding circuit plotted against the predicted total power from the SAGDesign test on plant feed. The SAGDesign test includes a ... first in the SAG mill and leaves the harder minerals to be ground in the ball mill. The SAGDesign database from its inception in 2004 to May 31 ...
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Most empirical comminution models are calibrated to two-stage AG/SAG mill and ball mill circuits -- this work compares the performance of several commonly used power-based …
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Partial secondary crushing of the mill feed is reported for example at Mt Rawdon in Queensland (Putland et al., 2004), Porgera (Thong et al., 2006) and St Ives in Western Australia (Atasoy et al ...
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Prior to embarking on the development of any type of high level control strategy, a series of tests is required to determine the nature of the relationships …
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• Critical size is a term used to describe coarse ore that builds up in a SAG mill. It is hard. But the reason it builds up is that the mill does not have enough power to …
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performing SAG mill. It is possible in some cases to modify a SAG circuit to force it to perform better, but this often takes time, much effort and costly modifications. In most cases the capital spent on a properly sized SAG mill may prevent production losses that would be many times greater over the extended start up period.
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Figure 4: A*b vs SAG kWh/t for operating AG/SAG mills (after Veillette and Parker, 2005) Relationship to the DWi . The SCSE is the output in kWh/tonne from a simulation of a particular SAG mill circuit configuration using the variable rates model in JKSimMet, one of which inputs is the A and b value. The DWi is a
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SAG mill model. The dynamic model of an AG/SAG mill includes several interlinked sub-process modules, and these modules can be updated individually. As shown in Fig. 1, the mill is divided into n sections, where m is the section number and q is the transported material. All sections have the same length, and each section contains a …
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5 where: Mib and Mia are the "fine" and "coarse" laboratory grindability metrics, respectively, P80 and F80 are the milling circuit product and feed sizes, respectively, µm, K is a calibration parameter of 0.95 for pebble crushing or 1.0 for no pebble crushing Barratt model: Barratt (1979) published a three-parameter model based on a copper porphyry mine
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The focus of this paper is not the development of a new dynamic model for a SAG mill circuit, and few details are going to be given at this stage about the underlying equations. The Simulink block
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Mill Sizing: After laboratory and pilot plant testing confirm the feasibility of autogenous or semi-autogenous grinding, it can be used to establish the exact grinding circuit and mill size.In the pilot plant tests, the tare power of the pilot plant mills should be determined before and after each test run. The tare power should be for the empty mill.
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The so-called population-balance models in JKSimMet are very granular, necessitating the acquisition of field data including (but not limited to): Full size distribution measurements …
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When operating a grinding circuit (at Granny Smith) under a wide range of conditions: campaigning very competent underground ore followed by soft oxide, primary versus secondary crushed feed and finally single-stage SAG and conventional SAG, ball mill and pebble crusher (SABC) configurations. Economics changed and a review of the …
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Opening the SAG mill circuit is thus an option for balancing the power distribution between primary and secondary grinding stages in the case of adopting the SABC circuit configuration for processing the Cristalino ore. The specific energy value (7.4 kWh/t) obtained of both SAG-5 and SAG-6 tests were interpreted as equivalent to an …
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