Introduction :The SAG Grindability Index (SGI) test, or alternatively the trademarked SAG Power Index (SPI), is a SAG-specific test involving a small batch SAG mill that is charged with a two kilogram ore sample and ground until the product has achieved an 80% passing size of 1.7 mm. The test result is reported as time required to achieve the target product
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Aug 06, 2015 In conventional milling, the ore is crushed to, plus or minus, 3/8 of an inch, before it is put into a mill for grinding. In a autogenous mill the ore is fed directly into the mill from either the primary crusher or the mine itself. The size of the rock will be between four and eight inches.
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The Grinding Balls will grind the material into powder size of 20 to 75 micron. In mining operations, this will allow for the liberation of gold and other precious metals that are hosted by the rocks. Many types of grinding media are suitable for use in a ball mill, each material having its own specific properties, specification and advantages.
Grinding machine is suitable for pharmaceutical, chemical, pesticide, food and food and other industries, the use is very extensive. The machine uses the movable teeth plate and the fixed tooth to cross examine the high speed relative motion, which causes the crushed material to be crushed by the impact of the tooth, the friction and the other the impact of each other.
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The Bond standard grindability test provides a Work Index that is widely used to estimate the energy required for grinding, but the test cannot be applied to fine materials such as plant tailing
working of ball mill and sag mill – SRM Mining Machines . How Does A Sag Mill Work | Crusher Mills, Cone Crusher, Jaw . Bond Ball Mill Work Index, kWh/t SAG kWh/t from 152mm to T80 1.7mm Up to 2007 2008 Data .
Nov 07, 2012 Mill (grinding) – Wikipedia, the free encyclopedia. Wi is the work index measured in a laboratory ball mill It is similar in operation to a SAG mill as described below but does not use steel balls in the mill. More detailed
Sag mill gmd how does it work - BINQ Mining
The work index covering grinding in tumbling mills of coarse sizes is labelled M. ia. The work index covering grinding of fine particles is labelled M. ib (Morrell, 2008). M. ia. values are provided as a standard output from a SMC Test (Morrell, 2004. a) whilst M. ib. values can be determined using the data generated by a conventional Bond
Jul 30, 2020 The Drop Weight Index (DWi) is a measure of the resistance of a sample to impact breakage. The DWi: Is measured in kWh/m 3 and is directly related to the JK breakage parameters, A and b, which are used in JKSimMet for design and optimisation of AG/SAG Mill circuits. Correlates with the Point Load index and UCS.
Rely on our proven track record of SAG and AG Mill superiority. Since the early 1980s, we have been designing and manufacturing Semi-Autogenous (SAG) and Autogenous (AG) Grinding Mills under the Fuller-Traylor brand. Semi-autogenous grinding uses a minimal ball charge in the range of 6-15% while autogenous grinding uses ore only. SAG and AG
SAGMILLING.COM .:. tools. Mill Critical Speed Calculation. Estimates the critical speed of a grinding mill of a given diameter given the mill inside diameter and liner thickness. If given a measured mill rotation (RPM), then the mill`s fraction of the critical speed is given. Internet Slide Rule.
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-stage crushing and single-stage ball milling (E ssbm) including Rowland efficiency factors.The circuit E total is equal to the E ssbm plus an inefficiency factor (CF) related to
Model:Bond/Barratt SABC Models - SAGMILLING.COM
EF5BM=[ P80+10.3 1.145 P80] ( 3 ) The EF4 formula requires both the rod mill and ball mill work index (rod mill Wi is used to calculate the optimal feed size) and because this is a “single-stage ball mill” calculation, the F80 is actually the rod mill feed size (10,000 m) from Table 1 and the P80 is the ball mill circuit product. The EF5 factor only applies below 75 m to ball
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.
SAG-mill Power Index (SPI) Test. The SPI test is carried out in a standardised mill under set conditions, with the output being the time to reach a given size, which can be converted to a SAG mill specific energy input (in kWh/t). The SPI index provides a profile of the hardness of the ore type and can be used for geometallurgical models.
Home; Blog; How A Sag Mill Works; How A Sag Mill Works. Sag Mill Troubleshooting Guide Autogenous and Semiautogenous mills liming AGSAG mills are often the optimum solution for wet grinding achieved in a slurry 50 to 80 percent solids AGSAG mills can accomplish the same size reduction work as two or stages of crushing and screening a rod mill and some or all of the work
The SAG mill pinion energy, W SDT (kWh/t) and SAG discharge Bond ball mill work index, S d-BWI (kWh/t), are then used to calculate the total energy to grind the ore from 80% passing 152 mm to 80% passing the client specified final product size P 80.This information, along with the ore specific gravity, is used to calculate necessary mill sizes and motor power in industrial applications.
SAGDesign Test | Starkey and Associates Inc.
Dec 07, 2018 This is because work index frequently changes as a function of the product size in comminution. If target grind size during a project is changed, or if the test is run at the wrong product size, then it is necessarily to provide a correction. The goal of this work is to create an equation to adjust a Bond ball mill work index from one P 80 basis
The SAG mill appeared to be the bottleneck in the flowsheet as the power in the SAG was high Bond work index results provided some frame of reference when the hardness of the ores at Copper Mountain were considered. PROOF OF CONCEPT - PORTABLE PRE-CRUSHING STATIONS .
1996) as the AG/SAG equival ent to the work index test. A SAG mill is operated in closed circuit . and the time required to grind the material to a P. 80. of 1.7 mm is used to predict AG/SAG Ecs .
laboratory ball mill work index can be used to compare the grindability of different ores in ball . smctesting 4 milling (Bond, 1961 and Rowland and Kjos, 1980). determine the AG/SAG mill specific energy required for that particular grinding task. Guidelines for the use of JKSimMet for such simulations were given in Bailey et al, 2009.
Surveys of the SAG mill during the first four weeks of operation showed the feed size distribution, transfer size and pebble rate to be lower or less than those catered for in the design
(PDF) Design of the biggest mill in the world
The Bond Ball Mill Work Index (BBWi) test is carried out in a standardised ball mill with a pre-defined media and ore charge. The Work Index calculated from the testing can be used in the design and analysis of ball mill circuits. The test requires a minimum of 10kg of sample that has been stage-crushed to 100% passing size of 3.35 mm. Any
operating work indices were calculated for each circuit. These are plotted for each circuit and shown in Figure 6. The ball mill values largely followed the Bond laboratory work index results, which were also obtained for each ore type. The AG/SAG operating work indices show their usual elevated levels compared to those from the ball mill circuit.
working of ball mill and sag mill – SRM Mining Machines . How Does A Sag Mill Work | Crusher Mills, Cone Crusher, Jaw . Bond Ball Mill Work Index, kWh/t SAG kWh/t from 152mm to T80 1.7mm Up to 2007 2008 Data .
Nov 07, 2012 Mill (grinding) – Wikipedia, the free encyclopedia. Wi is the work index measured in a laboratory ball mill It is similar in operation to a SAG mill as described below but does not use steel balls in the mill. More detailed
Assume a rod mill work index of approximately 15.2 (metric). Some manipulation of the ball mill work index results is required to correct the work index result to plant target P 80 . This is done by fitting the two tests to an equation of the form Wi(x) = a x b where x
Benchmarking: Yanacocha Single-stage SAG Mill -
The SAG mill pinion energy, W SDT (kWh/t) and SAG discharge Bond ball mill work index, S d-BWI (kWh/t), are then used to calculate the total energy to grind the ore from 80% passing 152 mm to 80% passing the client specified final product size P 80.This information, along with the ore specific gravity, is used to calculate necessary mill sizes and motor power in industrial applications.
Bond Ball Mill Work Index, kWh/t SAG kWh/t from 152mm to T80 1.7mm Up to 2007 2008 Data SAG Mill 75 32.00 986 4.17 0.1838 13.12 9,916 7,394 10,000 32 13.1 Modifying the sag mill feed size distribution,Secondary
SAG-mill Power Index (SPI) Test. The SPI test is carried out in a standardised mill under set conditions, with the output being the time to reach a given size, which can be converted to a SAG mill specific energy input (in kWh/t). The SPI index provides a profile of the hardness of the ore type and can be used for geometallurgical models.
WiRM: The calculated work index (SAGMILLING.COM uses only metric units; if the laboratory reported work index in short ton units, multiply that value by 1.1023 and enter the result). Extra field available for modelling synthetic indicates whether this is a real test result, or just a synthetic one that should only be used for modelling.
Home; Blog; How A Sag Mill Works; How A Sag Mill Works. Sag Mill Troubleshooting Guide Autogenous and Semiautogenous mills liming AGSAG mills are often the optimum solution for wet grinding achieved in a slurry 50 to 80 percent solids AGSAG mills can accomplish the same size reduction work as two or stages of crushing and screening a rod mill and some or all of the work
How A Sag Mill Works
Blank spreadsheet that is pre-populated with the field names needed to import laboratory test results into the SAGMILLING.COM circuit model testwork database (subscription required). Enter your test results, one per row, arranged into the columns indicated. To import into your testwork database, copy the block of cells starting with the top row
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. The online library of technical articles