Learn how to use and understand the power draw models for SAG and ball mills, rod mills, HPGR and crushers in the SAGMILLING grinding circuit modelling software. …
It is used in secondary calculations to estimate the wear of mill liners and media. The original wear formulae are widely published, including Page 752 of the "Mineral Processing Plant Design, Practice, and Control Proceedings", Volume 1, SME 2002. ... The ball wear equations in SAGMILLING use a newer calibration formula that uses the Bond ...
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 ...
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.
Benchmarking: Ball Mill Power Draw - Meadowbank. Muteb, P. & Allaire, J., Meadowbank Mine Process Plant Throughput Increase, Proceedings of the Canadian Mineral Processors Annual General Meeting, Ottawa, Canada, January 2013. The ball mill design given as: Diameter inside shell: 18 ft; Length (assumed to be flange-to-flange length): 29 ft
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.
Morrell SMC HPGR & ball mill Model. This is a secondary cone crusher, High Pressure Grinding Roll (HPGR) plus ball mill model that estimates the specific energy consumption using the equations of Morrell (GMSG, 2016). Testwork Required. The SMC™ test, stored in the "DWT" testwork table (SMC is a Drop Weight Test). Bond ball mill work index.
A SAG mill, or semi-autogenous grinding mill, is a type of machine used in mining and mineral processing operations. It uses the crushing and grinding action of rocks to …
SAGMILLING backup calculation 20-Sep-01 Alex Doll Mill Filling Calculation Purpose: determine the volume percent loading of a grinding mill by counting the number of exposed shell lifters when the mill is stopped. Disclaimer: This calculation is included on the web site for reference and the author accepts no responsibility for its accuracy.
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.
Raw Bond Model. This is a SAG or AG mill plus ball mill model that estimates the specific energy consumption (E SAG) using the 1979 Barratt equation and the classical Bond work index equation including Rowland efficiency factors.The model allows a manual calibration factor on both equations (CF SAG and CF ball, respectively).This formula usually gives …
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 ...
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 - …
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")
Rowland, Chester A, Bond's Method for Selection of Ball Mills, Advances in Comminution, ed. S. K. Kawatra, SME 2006, Pages 385 - 397 EF factor formulae are taken from Rowland, Chester A, Selection of Rod Mills, Ball Mills and Regrind Mills, Mineral Processing Plant Design, Practice & Control, SME 2002, Pages 710-754.
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!
See details of benchmarking. Benchmarking: Ball Mill Power Draw - Santa Rita. Latchireddi, S. & Faria, E., Achievement of High Energy Efficiency in Grinding Mills at Santa Rita, Proceedings of the Canadian Mineral Processors Annual General Meeting, Ottawa, Canada, January 2013. Faria, E. & Latchireddi, S., Commissioning and …
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 …
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.
Benchmarking: Amelunxen SGI Circuit Specific Energy Consumption - Macraes. Barns, K., Lane, G., Osten, K. & Scagliotta, N., Benchmarking Energy Efficiency - A Case Study at Macraes Gold Mine, Proceedings of the AusIMM MetPlant conference, Perth, Australia, September 2004. Raw data from paper. The paper describes overall plant unit operation …
Bond/Barratt Specific Energy Consumption SABC Model. This is a SAG or AG mill plus ball mill model that estimates the overall circuit specific energy consumption using the classical Bond work index equation for multi …
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.
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 …
If the rod mill (and crushing work index, to a lesser extent) are higher than the ball mill work index, then the circuit will probably require pebble crushing to operate efficiently. Desired transfer sizes. The transfer sizes displayed by the software are an instruction, and not a …
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.
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.
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.
Learn about SAG and AG Mills, which use ore and balls or pebbles to grind ore in mining operations. Find out how FL offers robust, efficient and customised mills in …
The El Soldado SAG mill operates in open circuit where pebbles are rejected to a different grinding line (of crushers with single-stage ball milling). The calibration parameters are different than Amelunxen, 2014: a 7% lower value for the coefficient (5.494 versus 5.9 in Amelunxen), and a slightly different exponent (0.563 versus 0.55 in ...
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.
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
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.
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 …
Classical Rod mill - ball mill circuit; Single stage ball milling; Bond/Barratt Models. These models require the three Bond work index values: Low-energy impact crushing work index, rod mill work index and ball mill work index. (Default) Optimized Bond/Barratt Model SABC (including phantom cyclone)
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)