Sag Mill And Ratio Of Bond Ball And Rod Work Index

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Sag Mill And Ratio Of Bond Ball And Rod Work Index

Autogenous Grinding & Semi Autogenous Grinding …

A screen analysis down to 3 mesh is also made. Bond Impact, grindability tests, and abrasion index tests are also run on the sample. Rod mill grindability tests for Work Index are run at 10 or 14 mesh, and ball mill Work Index tests are run at the desired grind if finer than 28 mesh.

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Testwork: Bond rod mill work index

The Bond rod mill work index is not as common as the Bond ball mill work index, and there are two different variations on the mill apparatus. The SAGMILLING models expect a mill with a "wave liner", and is not compatible with mills using "smooth liners". ... When Wi RM is used to size SAG mills, the Bond/Barratt model assumes a 14# Tyler ...

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Comparison of UCS to Bond Work Indices

FIGURE 8: ROD MILL/BALL MILL WORK INDEX RATIO v. UNCONFINED COMPRESSIVE STRENGTH 100 200 300 400 UCS (MPa) 0 0.5 1 1.5 2 WiRM/WiBM (metric) Siddall et al (1996) identified the ratio of Bond rod mill Work Index and ball mill Work Index as being indicative of an ore's compentency. Figure 8 plots this ratio versus …

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Table of Bond Work Index by Minerals

Source 1: Table of materials reported by Fred Bond Source 2: Outokumpu, The science of comminution Source 3: Equipment and pipelines Source 4: Tenova Bateman mills (AG/SAG, Rod, Ball Mill) Source 5: Doering international Source 6: SME handbook of mineral processing, N.L Weiss Editor, NY 1985. Bond …

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Using Rock Geomechanical Characteristics to Estimate Bond Work Index

2.2 Bond Ball/Rod Mill Work Index. Bond ball mill work index (BBMWI) test is a standard test used to measure the ball mill work, which is calculated in accordance with the procedure proposed by the Bond [21]. The BBMWI determines how much energy is needed to grind a sample of ore in a ball mill [22].

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Testwork: Bond rod mill work index

Rod 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 grind …

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Understanding the SAG Mill in Copper Ore Mining Process

How SAG Mills Work in Copper Ore Mining. SAG mills are a critical component of copper ore mining, as they play a vital role in grinding the ore into smaller pieces that can be further processed. These mills are typically large and use steel balls to break down the ore into smaller particles. The SAG mill works by rotating the drum at a low ...

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Model:Bond/Barratt SABC Models

The ball mill oversize feed factor (EF 4 BM) is always calculated with the rod mill work index for the optimum feed size and the ball mill work index for EF 4 BM. The model assumes that the calculated value of E ssbm + the specified contingency is greater than the sum of E sag + E peb ; otherwise E bm will be negative.

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Bond Rod Mill Work Index Equipment

Commentary on the apparatus of the Bond rod mill Work Index by Alex Doll December, 2015 alex.doll@sagmilling The Bond "Third Theory" of comminution was originally divided into three size …

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SAG Mill Grinding Circuit Design

Common convention generally refers to high-aspect ratio mills as SAG mills (with diameter to effective grinding length ratios of 3:1 to 1:1), low-aspect ratio mills (generally, a mill with a significantly …

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BOND'S WORK INDEX: WHAT IT IS AND WHAT IT ISN'T

Understanding your ore's variation of work index by size is particularly useful for SAG mill troubleshooting and production forecasting. Examples of the variation in work index at …

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Predicting the Overall Specific Energy Requirements of …

p80 = 80% passing size of the product in microns f80 = 80% passing size of the feed in microns Note that the Bond ball work index test should be carried out with a closing screen size which gives ...

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RoM BALL MILLS

RoM Ball mills, like SAG mills, utilise coarse rocks in the RoM feed as grinding media but with 25 – 40% steel balls added, which is advantageous when the coarse fraction in the RoM feed is ...

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Compare and Understand Rod/Ball/Impact …

Similar to the ball mill work index, the rod mill work index is a tumbling test that includes both attrition and abrasion breakage mechanisms. Unlike the ball mill work index, the size of the feed to a rod mill test (10 mm–12 mm) is closer to the size of the crushing test. Plotting the database of …

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Keys to best practice comminution

In those days, 3 stages of crushing, and rod and ball mill grinding, were common in comminution flowsheets. Bond's Rod Mill Work Index (RM Wi) and Ball Mill Work Index (BM Wi) tests provided good designs for grinding mills. If the design was 1200 t/d, each stage had to be able to produce 1200 t/d or (54 t/h at 92.6% availability).

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An Overview Of the SmAll-ScAle teStS AvAilAble tO …

world. It shows that the ball mill work index is normally distributed with an average of 14.6 and a median of 14.8 kWh/t. bOnd rOd mill GrindAbility The Bond Rod Mill Grindability Test is performed similarly to the ball mill test. The feed sample is stage-crushed to ½" and the test is run under a circulating load. As in

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sag mill and ratio of bond ball and rod work index

foundation of ball mill . Bond Ball Mill Work Index in kWh/t, and the ratio of SAG kWh/t to BWi. ... Our SAG/AG ball and rod mills ... Manual design of SAG/ball/rod mill foundations ...

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SAG mill VS Ball & Rod Mill

Surely its got to do with the feed size and product reduction size required? SAG mills are used predominantly with feed material with a larger max lump sizes (from primary crushing plant typically in the max lump size range 150 mm to 300mm and a psd to follow) and the ball or rod mills are for smaller feed lump sizes.

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IMPACT ON MILL DESIGN AND FLOTATION CONTROL …

May has shown that the SAG/Bond Wi Ratio, that is, the SAG mill hardness (kWh/t to grind the ore from F80 152 mm to T80 1.7 mm) divided by the Bond Ball Mill Work Index (also in kWh/t) for any ore, is a key property that should be used in the design of a SAG/ball mill grinding ... Note that all of Fred Bond's work dealt with rod and ball …

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COMMINUTION

operating work index) is also presented a product of for each simulation. For Greenfield design of an AG/SAG-ball mill circuit with JKSimMet, the additional power requirement in the ball mill(s) is determined with the Bond ball mill work index and the phantom cyclone technique. COMMINUTION Trusted Bench Scale and Pilot Scale

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What's the Difference Between Ball Mill, Rod Mill and SAG Mill?

different grinding media of ball mills, rod mills and SAG mills. Crushing ratio Comparison. The biggest feature of SAG mills is the large crushing ratio, which can crush and grind the materials to 0.074mm at one time, accounting for more than 20% to 40% of the total product.

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SAG Mill Testing

mill. As such, primary ball mills should be designed with the rod mill work index, and single-stage ball mills should be with both the rod mill and ball mill indices. This is because it is common to observe a difference (sometimes significant) between the rod mill and ball mill index values for a given ore type (McKen, Verret, & Williams, 2006). On

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Model:Bond/Barratt SAB 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 …

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SAG Mill Testing

The work index series (ball mill, rod mill, and MacPherson autogenous) and pilot plant tests require relatively more weight (for a given top size) because they are run until a steady …

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Modified Bond Ball Mill Work Index Test

The Thirty-nine samples were submitted for the Crusher Index (Ci), SAG Power Index (SPI®), Standard Bond Ball Mill Work Index (BWI) and Modified Bond Ball Mill work Index (MBI) tests. The Ci, SPI® and Bond Wi values of these samples show a good indication of ore hardness variability within the ore body.

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Commentary on the apparatus of the Bond rod mill work …

A "Bond" rod mill work index is to be determined in an apparatus with a wave liner. The author is aware of six laboratories that offer a rod mill work index test …

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Comparison of UCS to Bond Work Indices

This paper examines potential relationships between UCS and Bond Work Index values (crushing, rod mill and ball mill). Data from 11 mines located around the world is …

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Calculate a Mill's Operating Work Index

Use this online formula to calculate a Ball Mill, Rod Mill or SAG Mill Operating Work Index. Based on Fred Bond's work you can estimate the energy used …

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USING THE SMC TEST® TO PREDICT COMMINUTION …

can be determined using the data generated by a conventional Bond ball mill work index test (M. ib. is NOT the Bond ball work index). M. ic. and M. ih. values are also provided as a standard output from a SMC Test ® (Morrell, 2009). The general size reduction equation is as follows (Morrell, 2004. b): f x f x 2. 1 i i. 4 2 W M x x. 1 (1) where ...

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Toward a Simple Approach Determining Single …

Single stage SAG mills, SAG mill aspect ratio, simulation, modelling ... the SAG mill and ball mill depends on the energy requirement between both duties. ... The Bond rod work index in kWh/t .

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