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Bond work index is being widely used to the estimate power required to grind materials. Because grindability is so widely used in mill design the assumption is often made that the method is valid ...
The work index Wi was defined by F. Bond as the specific energy (kWh/ton) required to reduce a particulate material from infinite grain size to 100 microns. The calculation is based on the size-energy relationship e1,2=C.(1/x2n–1/x1n ), which for n = 0.5, x1 = ∞ and x2 =100, by definition gives e∞, 100 = Wi and consequently C=10Wi. In theory, for a given material the value found for Wi ...
characterized using XRD, XRF, and electron and optical microscopy. A simulated test method for Bond ball mill work index (BWI) was used to perform the comminution test. The results showed BWI values vary from 5.67 kWh/t to 20.21 kWh/t. Examination of the possible correlations between BWI and the geological features
For Ore A a Bond ball mill work index value of 17 kWh/t was reported. For ore B a Bond ball mill work index value of 15 kWh/t was used. Further comminution tests will be required in the future to confirm this is representative of the ores to be processed. The bond index values generally indicate that grinding is moderate power consumer.
BWi: Bond ball mill work index EMC: Element to mineral conversion GCT: Geometallurgical comminution test MLA: Mineral liberation analysis ... Figure 31 Comparison of modal minerology for SDP samples (quartz, actinolite, orthoclase, chalcopyrite,
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 Mills) Source 5: Doering international …
The work index . W. i. was defined by F. Bond as the specific energy (kWh/ton) required to reduce a particulate ... using a novel ring mill, a laboratory ball mill, a labora- ... study for quartz grinding, using the semi continuous process described above and for screens of 850, 425, 212, 106 and 53 . …
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The work index expresses the resistance of the material to grinding. It represents the kilowatt hours per tonne required to reduce the material from theoretically infinite feed size to 80 passing 100μm (Wills and Napierpercent -Munn, 2006). Bond devised several methods for predicting ball-mill and rod-mill energy requirements and
3- STANDARD BOND TESTS The Bond's standard ball mill is used to determine the work index value of differ ent samples. The Bond work index is defined as the kilowatt-hours per short ton required to break from infinite size to a product size of 80% passing 100 µm. If the breakage
ABSTRACT: The study on work index evaluation of Ishiagu galena ore has been carried out. Quartz and Granite obtained from the same location at a distance of 40m apart from lead ore deposit were used to determine the Bond's work index of the lead ore. The samples were crushed, ground and pulverized using a ball mill.
bond grinding work index for quartz stone bond ball mill work index for pure quartz Cached Bond Work Index was determined with regard to Get Price And Support Online Bond Mill Work Index mayukhportfolio bond ball mill work index for pure quartz . live chat. Quartz Grinding Machine In Gujranwala Pakistan.
The grindability of an ore in the process of mineral dressing can be determined by use of the Bond work index (Wi). This index is determined on a laboratory-scale using a Bond ball-mill and by ...
bond work index for an ultrafine mill jjvastgoed.nl. bond method for ball mill work index test. Bond Work Index an overview ScienceDirect The ball mill work index laboratory test is conducted by grinding an ore sample prepared to passing 3.36 mm (6 mesh) to product size in the range of 45-150 µm ( mesh), thus determining the ball mill work index (Wi B or BWi).get price
The 8 Zone composite is characterized by a moderately altered pyroxenite host rock cut by swarms of millimeter-scale quartz veins. Overall, the samples tested exhibited soft to moderate hardness with Bond ball mill work index values, at P 80 of 106 microns, ranging from 9.7 for the 8 Zone composite, to 17.1 in the strongly silicified Austin ...
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The Bond ball mill work index ranged in value from 14.1 to 18.7 kWh/tonne. The Mitchell Zone and Kerr samples had relatively consistent Bond ball mill work indices, ranging from about 14 to 15 kWh/tonne. On this basis, these samples can be considered moderately hard. The two Sulphurets samples had Bond ball mill work indices of 16.7 and 18.7 ...
Bond ball mill Work Index and rock hardness • Volume % of quartz veins has the greatest impact in the physical rock properties. • Barren quartz veins comprise up A-veinvolume% (ondrillhole) vs 0.25% Cu grade shell FIRST QUANTUM MINERALS to 10 vol% The power consumption to grind the rock will mostly depend on the % of quartz veins.
Bond work index value of these components mixtures is greater than the Bond work in-dex of harder components, clinker. Oner (2000) have conducted a research of clinker and blast furnace slag mixture Bond Work Index in different mass propor-tions. He found out that these values are always lower than the Bond Index obtained
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[Table 4] Bond Work Ball Mill Index (Kilowatt hour/tonne). The Bond Ball Mill Work Index is a measure of the energy needed to grind ore to a specific size. It is an important factor when assessing potential processing costs as energy consumption is a significant part of the total milling cost. Property Bond Work Index (kWh/t) Soft 7-9 Medium 9-14
Bond ball mill work index determinations for the composites ranged from 11.1 kWh/tonne to 13.5 kWh/tonne, with an average of 12.4 kWh/tonne. Based on these results the mineralization would be considered to have a moderate hardness from a rod and ball milling perspective.
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A Bond's Ball Mill Work Index (BWi) was determined for the supplied sample at a closed size of 100 mesh (150 microns). The work index of the sample was 15.55 kWh/st. The results indicate that the sample would be considered hard. A Bond Abrasion Index (Ai) was determined for the supplied sample. The abrasion index of the sample was 0.798.
Grind Ability Lime Stone costaverde hardgrove grindability index of lime stone page of lime stone 4.9 9911 Ratings ] The Gulin product line, consisting of more than … Get Price Autogenous mills, semi Autogenous mills, semi-autogenous mills and ball mills for wet, grinding lime-stone for a flue, Shell-supported grinding mills offer special ...
Bond Ball Work Index for Some cement raw materials is as under. (FC Bond Paper) Limestone 11.30, Shale 16.40,Bauxite 9.45, Gypsum 8.16, Silica Sand 16.46, Iron Ore 15.44, …
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Ball Mill Bond Work Index: WiB = 12.1 kWh/st Comparison of Ore Hardness Measurements for Grinding Mill … SAGDesign (SAG to T80 12 M followed by Bond BM Wi on SAG ground ore) Bond Ball Mill Work Index (Crushed Feed) Specific Gravity (part of the SAGDesign test).
An alternative mill ball charge is proposed that closely approximates Bond's original total ball mass, number of balls and ball surface area. Results of 30 Bond Work index tests of six pure ...
The FC Bond Work Index Test Ball Mill was designed by F. C. Bond for use in determining the Bond Index, a measure of grindability and power required for grinding applications. The FC Bond Mills are used in laboratories throughout the world. A copy of Fred C. Bond's Method of Crushing and Grinding for determination of the Bond Index is included with each mill.
The Bond ball mill grindability tests were conducted for the untreated and microwave-treated (2.45 GHz, 1.7 kW) quartz and calcite representative samples. The findings showed that the Bond work indices of the untreated quartz and calcite are 11.49 kWh/ton and 5.21 kWh/ton, respectively.
Bond Work Index Tables (Wi) - Free download as PDF File (.pdf), Text File (.txt) or view presentation slides online. Here there are given tables from various sources for the Bond work index values of mining materials (ores, industrial minerals and rocks). These work indexes can be used for the determination of tumbling mills (rod, ball mills) power.
Overall, the samples tested exhibited soft to moderate hardness with Bond ball mill work index values, at P80 of 106 microns, ranging from 9.7 for the 8 Zone composite, to 17.1 in the strongly silicified Austin composite. About Madsen
Ball mills usually operate at 65% to 75% of the critical speed. The critical speed is calculated as under [5]. R r g 2 1 n c (2) 2.1.3 Work Index: Work index is defined as the gross energy required in kilowatt-hours per ton of feed needed to reduce a very large feed to such a size that 80% of the undersize passes through 100-µm screen [5].
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