Ball mill Operating strategy when circuit is SAG-limited (note, fixed speed ball mills can only be vary P 80) ... Morrell specifically discourages use of transfer size in calculations such as those in SAGMILLING for a variety of reasons (see discussion in Morrell, SAG 2011). Unfortunately, the alternative method proposed by Morrell is an ...
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Sagmilling is home to a collection of both free and subscription-based calculation tools to aid metallurgical process engineers perform comminution calculations. Grinding circuit design tools, including for SAG mill-ball mill circuits, and geometallurgy energy models are available to subscribers.
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The bibliography contains references to the source documents of various models and to benchmarking information. Benchmarking is the comparison of model predictions to actual operating results for mills and milling circuits. Some benchmarking surveys also include adjustments to model tuning factors based on observations from the industrial plants.
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The Amelunxen SGI model built into sagmilling is based on the method by Amelunxen et al (2013). It is a power-based model that predicts E sag using the SAG grindability index (should be compatible with SPI™), and predicts E ball using the Bond ball mill work index with a manual calibration factor CF ball to account for effects like the ...
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Entering/changing a mill. Mills are added to projects, and then circuits are created out of combinations of mills. See the section on Creating a project to create a project to add a new mill to.. For the purposes of the model, a crusher is considered a special type of mill. Adding a crusher is the same as adding a mill.
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Contents. 1 Entering/changing a mill. 1.1 Entering a new mill. 1.2 Changing an existing mill. 2 Mill fields. 3 Adding a mill to the default list. Entering/changing a mill. Mills are added …
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Bond rod mill work index versus A×b Only considering rod mill work index tests performed in laboratory mills equipped with wave liners. This is the standard specified by F. Bond and is typical of laboratories in North and South America. Non-standard (Australian type) rod mill results also shown for comparison.
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More specifically, it should have a rod mill work index greater than the ball mill work index, and a ball mill work index below 20 metric units: A SAG-amenable ore has the opposite orientation, the rod mill work index should be equal to, or less than the ball mill work index.
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The SAGMILLING database is configured to handle the following types of tests and related geological information: Laboratory tests of grindability, impact, abrasion and compression. wibm: Bond ball mill work index (sometimes called "BWI") wirm: Bond rod mill work index (sometimes called "RWI")
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Morrell Mi (SMC) single-Stage SAG Mill Model. This is a SAG or AG mill model that estimates the specific energy consumption (E SAG) using the equations of Morrell (2004). Testwork Required. The SMC™ test, stored in the "DWT" testwork table (SMC is a Drop Weight Test). Bond ball mill work index.
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The mill power draw models used in SAGMILLING all reference power as drawn at the mill shell. Most surveys report power values as they are measured in the plant distributed control system (DCS), which is usually relative to the motor input power.
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Learn about the advantages, configurations, and applications of SAG mills in large grinding circuits. Compare SAG mills with AG mills and other comminution machines in terms of throughput, power, media, …
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Consulting services. Testwork programs Sample collection and laboratory test programs are at the heart of any comminution system design program. Alex Doll, the principal at sagmilling, has extensive experience in the design of drill-core sampling programs that account for the spatial and geological variation in orebodies, as well as the …
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Mill Power Draw Model Bibliography. Mill power draw models are used to predict the usable power draw that a particular mill will generate. The three SAG mill models are benchmarked and reviewed in: Doll, A.G., A comparison of SAG mill power models, Procemin 2013; Austin SAG Model. The Austin SAG model was published in: Austin, L.G.
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Rod mill and ball mill circuit models Bond/Rowland rod mill & ball mill model; Multi-stage crushing and ball milling models Bond/Rowland multi-stage crushing and single-stage ball mill model; Morrell multi-stage crushing and single-stage ball mill model; Bond HPGR and ball mill model (using work indices) warning, experimental!
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For example, you may have 29 rows exposed at the discharge end of the mill, and only 28 exposed at the feed end. If so, enter 28.5 for the number of exposed lifters. Calculated Mill Charge: % Calculation backup: The details of the calculation are available in the attached files. Feel free to download them for use in your own work subject to the ...
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Crushing mill work index is used in the SAGMILLING Bond/Barratt specific energy consumption model. The work index is used to calculate the energy requirement to break rocks in the coarse size range, from >100 mm down to about 10 mm - …
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HPGR and ball mill circuit. This is a highly experimental model. Use at your own risk! The high pressure grinding roll (HPGR) and ball mill circuit can be thought of as a variation on the classical single stage ball mill (SSBM) circuit with the final stage of cone crushing replaced by an HPGR.
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Commentary on the apparatus of the Bond rod mill work index Alex Doll, SAGMILLING August, 2023 alex.doll@sagmilling The Bond "Third Theory" of comminution was originally divided into three size classes reflecting the varieties of comminution equipment common during the time period when Bond (and his collaborators)
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This motor input is immediately converted to mill shell power for use in circuit model equations by multiplying the model result by 0.97 mechanical efficiency factor and by 0.96 typical induction motor efficiency factor. The displayed Morrell C-model result in sagmilling is always corrected to mill shell power.
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History. The SAG mill model by proposed by Leonard Austin (1990) was largely based on modifications of earlier tumbling mill models by Hogg & Fuerstenau and F. Bond. The model uses a kinetic-potential energy balance to describe the power draw of a mill charge. Many geometric components of the earlier models were fit to empirical relationships …
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CIC offers semi autogenous grinding (SAG) mills for sale, which can perform grinding operations equivalent to two or three stages of crushing and screening. SAG mills have …
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Benchmarking: Ball Mill Power Draw - Collahuasi. Villouta, R.M., Collahuasi: After years of operation, Proceedings of the International Autogenous and Semiautogenous Grinding Technology conference (SAG 2001), Vancouver, Canada, Pages I-31 – I-42 Ball mill dimensions 22 ft diameter by 36 ft (35.5 ft effective grinding length) shell-supported, flat …
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Bond ball mill test procedure were carried out on crushed (-3.35 mm / 6 mesh) material at different screen closing sizes (300 µm, 212 µm, 150 µm, 106 µm, and 75 µm). The screening process was conducted in four sets of 12-inch diameter screens for sufficient amount of time to avoid too much materials fed into the screen at one time.
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History. Brian Loveday (1978) published a scale-up procedure for autogenous pilot plant power draw to industrial sized machines that used an empirical power number to encompass all the motion effects of a mill charge. Derek Barratt (2002) derived a set of power numbers for industrial machines for use in Loveday's base formula, where a …
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Unlike other mill power models, this value is used to "tune" the amount of power absorbed by the ore. It includes mechanical losses in the drive train, but most of this efficiency is related to how effective the crusher is at transmitted power into breakage. Typical values by type of machine: Pebble crusher, choke fed (with a bin) = 0.75
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