Bond Abrasion index
These simple measures were able to predict mill life close to 99% for various ores, power, and throughput over the wear action and its change to performance for a number of large sag mills with known ball/ore ratios. Abrasion index, in my opinion, is way down the list of important criteria.
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Physical Bauxite Processing: Crushing and Grinding of Bauxite
Abrasion Index. Bauxite ore typically falls into the lower UCS ranges and therefore lends itself to various types of crushing technologies. Of all the variables listed, the two main variables that drive the crusher selection are the feed rate and the percentage of moisture in the feed. ... Because ball mills have limited ability to handle ...
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A Mill Abrasion Test for Wear Resistance of Armour Stone
The abrasion mill test uses increments of milling time to generate a weight loss curve, the slope of which gives the abrasion resistance index. This new index, k s is compared with wet attrition and aggregate abrasion values for a suite of 11 rocks with wide ranging strengths. Los Angeles Abrasion Test results are briefly mentioned.
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AG/SAG/Ball Mill
SAG/Ball Mill Sizing Gross Power Draw and Specific Energy Calculator for Autogenous Grinding (AG), Semi-Autogenous Grinding (SAG) and Ball Mills. Exit Mill Calculator ... Abrasion Index (Ai)-Power Required - Metallurgical. Description. Value Units. Throughput Capacity: [t/h] Specific Energy Required: [kWh/t] Power Required: [kW]
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Table of Bond Work Index
Hello, I was checking the Table of Ball Mill Index. Regarding the source 1 (Bond), I checked the source and the values are different. ... For a particular application or project to size a mill circuit it would be prudent to have the Work Index (also for abrasion or crushing) determined at a mineral processing laboratory.
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Bond Abrasion Index Tester
Bond Abrasion Index Test Machine. The Bond Abrasion Index, devised by F.C. Bond in the 1940's, quantifies the abrasivity of an ore. The index can be used to calculate metal wear rates in crushers and ball …
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BOND'S WORK INDEX: WHAT IT IS AND WHAT IT ISN'T
The reason for this variation in ball mill work index is because the ore at Mt. Milligan has an intrinsic exponent of –0.45 in the 100 µm to 200 µm size range, not the –0.50 exponent empirically measured by F. Bond. The work index increase between 100 µm and 76 µm is due to a porphyritic grain size that causes a spike in energy
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Metallurgical testwork demonstrates low-cost crushing and …
Bond Abrasion Index (Ai) – average results were 0.28 for fresh ore and 0.06 for transitional ore Bond Rod Mill Work Index (RWi) – average results were 13.2 kWh/t for fresh ore and 8.5 kWh/t for transitional ore
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AGGREGATE TOUGHNESS/ ABRASION RESISTANCE …
The Micro-Deval abrasion test was developed in France during the 1960's. It is a wet ball mill test. A 1.5 kg graded aggregate sample (retained on the 9.5 mm sieve), 2 L of water and a 5 kg charge of 5 mm diameter steel balls are placed in a stainless steel jar mill and rotated for 2 hours.
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A new methodology to obtain a corrected Bond ball mill work index …
Based on the standard procedure defined by Bond, the ball mill work index is determined by simulating a closed cycle dry grinding in a laboratory Bond ball mill until a stable circulating load of 250% is established (Bond, 1949, Bond, 1952, Bond, 1961). The ball mill work index is determined by Eq. (10). The recommendation is the ball mill ...
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Comparison of Ore Hardness Measurements for Grinding Mill …
standard Bond crushing, and rod mill work indices, abrasion indices and by Dawson for Bond Ball Mill Work Index tests using crushed feed, and Standard Autogenous Grinding Design (SAGDesign) Tests, patented by Outokumpu. (See reference 8 below). The comparison of these results gives context to how the various measurements relate to each
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Grindability
Grindability is an important factor for the characteristic of the brittle raw materials by the design the mills. As grindability depends on many unknown factors, hardgrove grindability index (HGI) is determined empirically using a sample mill, according to the following procedure. The device to measure the hardgrove grindability consists of a ...
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The Effect of Grinding Media on Mineral Breakage Properties
The breakage and liberation of minerals are the key to fluidized mining for minerals. In the ball milling process, steel balls function as not only a grinding action implementer but also energy carrier to determine the breakage behavior of ores and the production capacity of the mill. When ground products present a much coarse or much …
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How Abrasion Index affects Wear Rates
What is the relationship between Abrasion Index affects Wear Rates of steel ball mill and rod mill liners as well as the wear life or consumption of grinding balls or rods. A little bit of data on crusher (gyratory and roll) liner wear life …
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Bond Work Index Tests | GSL
The Abrasion Index is a recognised procedure to quantify abrasiveness and approximate wear that can be expected on media and mill liners. The test requires a minimum of 5kg …
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Cone Crushing, Rod Milling and Ball Milling Laboratory Testing
work indices from Bond ball mill grindability tests; abrasion index; Four of the eight circuits, namely figures 7, 8, 9a and 9b, involve the use of cone crusher to produce either rod mill or single stage ball mill feed. A new test procedure, called the Twin Pendulum Impact Test, which is not part of the autogenous media competency test ...
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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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Determination of Abrasiveness in Copper-Gold Sulfide Ores: A
The outcome of this test is the Bond abrasion index (Bond Ai), ... Albertin, E.; Sinatora, A. Effect of carbide fraction and matrix microstructure on the wear of cast iron balls tested in a laboratory ball mill. Wear 2001, 250, 492–501. [Google Scholar]
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Bond Work Index
Ball Mill Circuit with a Scalped or Truncated Mill Feed. Sign in to download full-size image Figure 3.11. Typical Mill Circuit Represented by the Bond Ball Mill Test. The procedure …
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A new approach to the calculation of bond work index
A new methodology to obtain a corrected Bond ball mill work index valid with non-standard feed size. 2022, Minerals Engineering. Show abstract. The grindability of raw material is generally determined by Bond's standard ball mill grindability test (developed by the Allis Chalmers company). The ball mill grindability test is used for ...
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Procedure for determination of ball Bond work index in the …
In the determination of ball mill work index 15 kg of representative ore at ... The Frederick C. Bond has several grinding indices (ball, rod, abrasion), one of which has been a significant guide for ball mills. The Bond ball mill work index is an expression of the material's resistance to ground and a measure of the grinding efficiency.
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A new methodology to obtain a corrected Bond ball mill work …
This paper describes a methodology for providing an estimation of the Bond ball mill work index for a sample of non-standard size (F 100 ≠ −3.35 mm) when all …
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Technical Information
Technical Information. Information about sample size, calibration, precision and accuracy. The SMC Test® is the most widely-used comminution test in the world for AG & SAG Mills, HPGRs and Crushers. The SMC Test® was developed to provide a range of useful comminution parameters through highly controlled breakage of rock samples.
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Comminution Testing Equipment in Mineral …
Rod and ball mills from rod and ball mill work indices using procedure given in "Minerals Processing Plant Design". Steel consumption is determined using abrasion index from the abrasion test and procedure …
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Using Abrasion Index for calculating Steel Balls and mill liners
Balls: lb/kwh-hr=0.35 (Ai-0.015)^0.33. I know of a practice that uses 50 percent of the theoretical consumption calculated by the Bond formula for ball mills; for SAG Mills 65 …
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Bond Work Index Formula-Equation
In the standard A-C closed circuit ball mill grindability test the work index is found from. where Pi is the opening in microns of the sieve mesh tested, and Gbp is the net grams of mesh undersize produced per revolution of the 12″ x 12″ test ball mill. The closed circuit 80% passing size P averages P1/log 20 for all sizes larger than 150 mesh.
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Compare and Understand Rod/Ball/Impact-Crushing/Abrasion …
Rarely is there a relationship between the Bond ball mill work index and the Bond crushing (impact) work index. Two reasons for this are: 1. The size range over which the two tests are valid (the ball mill test feed is about 2 mm, whereas the crushing test feed sizes are between 50 mm and 75 mm). 2. The dominant …
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Bond Work Index Procedure and Method
The F.C. Bond Ball Mill is a small universal laboratory mill used in calculating the grindability of all ores. GRINDABILITY IS THE …
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Rod Mill
Overcharging results in poor grinding and losses due to abrasion of rods and liners. Undercharging also promotes more abrasion of the rods. The height (or depth) of charge is measured in the same manner as for ball mill. The size of feed particles to a rod mill is coarser than for a ball mill. The usual feed size ranges from 6 to 25 mm.
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Bond Work Index Tests | GSL
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 passing size of <3.35 mm.
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