Bond Work Index Procedure and Method
This Grindability Test or Bond Ball Mill Work Index Procedure is used to determine the Bond Work Index of minus six mesh or finer feed ore samples. These equation application methods are used to process <1/2″ ore …
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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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Comminution
If plant data are not available, laboratory test needs to be conducted on the ore sample of interest. Bond developed crushing, rod mill and ball mill laboratory tests. In the popular Bond ball mill test [5, 6], the standard mill is 0.305 m diameter by 0.305 m length with rounded corners, running at 70 rpm. The grinding charge consists of 285 ...
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(PDF) Field monitoring and performance evaluation of crushing plant
Physicomechanical properties of ore campaigns Blend type Bond work index (kWh/Mg) Compressive strength (MPa) Moisture content (%) 9.9 9.3 10.1 9.7 19.2 27.5 18.8 17.8 3.5 3.8 3.3 3.6 Spec CO BYO BCO Equipment factor To control the quality of ore produced from the crushing plant, the appropriate equipments should be selected for the sustainable ...
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A New Approach to the Calculation of Bond Work Index …
Grinding media influence the energy consumption and efficiency of the grinding process during the calculation of the Bond Work index (BWi), a well-known method for selecting comminution equipment, evaluating milling efficiency, and calculating required milling power. Traditional grinding tests often choose steel balls as the grinding media, but ceramic balls are …
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Metallurgical Testing for Iron Ore
• SPI (Sag Power Index) Test • Bond Ball Mill Grindability Test • Bond Impact Test • Abrasion Test • JK Drop-Weight Test • MacPherson Autogenous Grindability Test • MacPherson 18" Mill Test Well-instrumented pilot-scale autogenous grinding circuits, ball and rod mill circuits, and crushing circuits are also available
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Investigation on the particle size and shape of iron ore …
Investigation on the particle size and shape of iron ore pellet feed using ball mill and HPGR 909 areas of 500–1600 cm2 g-1.The concentrate must therefore be re-ground in order to
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Article Determination of Work Index of Muro Iron Ore …
100 g each of the test ore (Muro iron ore) and the reference ores (marble and granite) were crushed and pulverized in the laboratory ball mill for 20 minutes.
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Bond Impact Crushing Work Index -Procedure and Table of …
The test determines the Bond Impact Work Index which is used with Bond's Third Theory of Comminution to calculate net power requirements when sizing crushers*. It is also …
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Crushed Iron Ore
Crushed Iron Ore is created by crushing Iron Ore in one of three different crafting stations. The crafting stations come with different ratios, labor cost and time cost. The two lover crafting stations also have a byproduct of Crushed Sandstone. Crushed Iron Ore needs to be further refined to Iron Concentrate before it can be smelted into an Iron Bar.
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EFFECT OF OPERATING VARIABLES ON BOND'S WORK …
The Bond work index is a measure of ore resistance to crushing and grinding and is determined using the Bond grindability test. Its value constitutes ore characteristic and is used for...
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The Effect of HPGR and Conventional Crushing on …
The results show that the UG2 ore's response to HPGR crushing conforms to the response that has been observed in other ores, e.g., zinc ore, iron ore, copper ore, and gold ore [17,19,45,46]. The data presented in …
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Characterization and Comminution Studies of Low-Grade Indian Iron …
Banded hematite quartzite (BHQ) and banded hematite jasper (BHJ) ores represent a promising potential iron ore resource in the near future. The hematite and quartz in BHQ and the hematite and jasper in BHJ are closely related and require fine grinding for the liberation of hematite phases. The present study investigates the mineralogical features and …
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Investigation of iron ores based on the bond grindability test
The Bond work index for 'B' and 'C' type iron ore sample are of 11 and 10 KWh/mt. The variation of BWI of three iron ore sample may be varied during the geological formation of each iron ore sample. The output product of three iron ore sample composed of three different size fractions when ground in Bonds ball mill. Based on the BWI and ...
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Rapid determination of Bond rod-mill work index by …
It is a well-known fact that the value of the Bond work index (wi) for a given ore varies along with the grinding size. ... The representative ore sample contained 57%Fe, 0.9%P and 0.17%S. The sample was crushed; afterward, it was ground in various grinding times according to the Bond Ball mill approach to specify the work index values ...
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The Extractive Metallurgy of South Africa's Platinum Ores
(SAG) milling developments in the South African gold industry brought these milling circuits to the Merensky ores. A few circuits are single-stage milling op-erations (Impala Platinum), but most cir-cuits have two stages of milling and, in some cases, a third regrind operation has been added. Circuits with several stages of milling also follow ...
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Bond Work Index
The low energy crushing work index laboratory test is conducted on ore specimens larger than 50 mm, determining the crushing work index (Wi C, CWi or IWi (impact work index)).
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Procedure for determination of ball Bond work index in the …
The Bond work index is a measure of ore resistance to crushing and grinding and is determined using the Bond grindability test. ... The bonding index for iron ore, low grade and high grade ...
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Characterization and Bond Work Index Determination of …
As well as, the Bond Work Index (BWI) and consumed power to grind one tone of iron ore were determined via standard Bond mill. The results showed that the ore is hematitic ore with Goethite and ...
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A new approach to the calculation of bond work index
Crushing and grindability are the parameters that characterize the resistance of raw materials to crushing. There are several procedures for determining the brittleness and grindability, and in practice, the most widely used methods are F. C. Bond (Bond, 1961).Bond's method continues to receive much attention on an industrial scale because of its pragmatism …
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Using Rock Geomechanical Characteristics to Estimate Bond Work Index
Therefore, this measure can be cheaply determined using other rock characteristics. In addition, the value of the BWi determines the energy required for crushing and milling (depends on the BWi type, e.g., crushing work index, Bond ball mill work index, and Bond rod mill work index), and this measure can be used to optimize processing throughput.
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Magnetite Iron Ore Design Case Study
Drop Weight Index (DWi) kWh/m3 11.1 Ore SG 3.40 Concentrate SG 4.30 Bulk Density t/m3 2.01 Bond ball mill work index (BBWi) kWh/t 17.2 Bond abrasion Index (BAi) 0.30 Bond rod mill work index (BRWi ...
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crushing index and abrasion index of limestone ore
Ammtec. Bond Abrasion Index ... vary from a low of 0.026 for limestone through 0.18 ... Since both the JKMRC and the MacPherson procedures stage crush the ore sample ...
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Bond Work Index Tests
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. Any screen size below 600µm can be used for the testwork depending on your requirements. Bond Rod Mill Grindability Test. GSL can ...
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The six main steps of iron ore processing
When iron ore is extracted from a mine, it must undergo several processing stages. Six steps to process iron ore. 1. Screening We recommend that you begin by screening the iron ore to separate fine particles below the crusher's CSS before the crushing stage. A static screen is used to divert the fine particles for crushing.
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Bond Work Index Formula-Equation
For any circuit, whether a crushing circuit, a rod mill, or a closed ball mill circuit, the Work Index always means the equivalent amount of energy to reduce one ton of the ore from a very large size to 100 um. The sample was …
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Variability Study of Bond Work Index and Grindability …
In this study, a variability bysis is carried out with the Bond standard grindability tests on different critical metal ores (W, Ta), ranging from coarse grinding (rod mills) to fine grinding (ball mills).
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Investigation of iron ores based on the bond grindability test
The maximum Bond work index of 14 KWh/mt was obtained for 'A' type iron ore sample. The minimum Bond work index of 10 KWh/mt was obtained for 'C' type iron ore sample. As the Bond work index was more for 'A' type iron ore sample, the P80 passing percentage of 'A' type iron ore sample is less than other samples of iron ore. Based ...
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Correlation of crushing work index and drop-weight index.
Ore hardness can be estimated using commercially available standard techniques such as the SAG Power Index (SPI), Bond Work Index (BWI), and JK Drop Weight (JKDW) tests (Bailey et al., 2009 ...
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Bond Work Index Report Matrix House
The Work Index is used when determining the size of the mill and grinding power required to produce the required ore throughput in a ball mill. 2. Procedure 2.1. Bond Ball Mill Grindability The sample was crushed to passing 6 mesh (3.35mm), from this a 700 cc volume was measured and weighed to be used as feed for the Bond Mill.
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