The work index (W i) is the comminution parameter that expresses the ore resistance to crushing and grinding The Wi is equivalent to the needed kilowatt hour per short ton, in order to reduce an ore size distribution from the infinity value to 80%

Get PriceFor the tested biochar samples, the Bond work index and settling rates were twice as less than those of coke Because of high slurry viscosity, dilution to ≤30% solids is required for wet grinding Heating values similar to coke and lower SiO2 and Al2O3 content are typical

Get Price[2], the operating work index (Wio) of an existing grinding circuit can be calculated, given known mill power draw, throughput, feed and product size distributions kWh/t = Power applied per ton of feed to the grinding unit Wi = The standard Bond work index of the ore P 80 = The 80% cumulative passing size of the product in microns F 80

Get PriceJan 21, 2015· Ai-Bond Abrasion Index 032 017 4 BWi-Bond Ball Mill Work Index (kWh/t) 194 199 5 Notes: 1 The UCS results indicated that the samples range from strong to very strong 2 The Bond CWi results indicated the crushability of the samples is medium 3 The SMC results indicated that grinding of the samples by SAG milling of the samples is hard 4

Get PriceThe specific surface area of three iron ore samples is as follows Sr No Jindal No S cm2 /gm 1 A 134148 2 B 12784799 1 1490 NGP Specific surface area determination by Blaine apparatus on three Iron ore samples from Bellary dist, Karnataka for M/s Jindal Vijayanagar Steel Ltd 3 C 152671 Specific surface area determination by Blaine

Get PriceBond index is useful in designing of grinding system in mineral processing In this study, the Bond work index of Birnin- Gwari iron ore in northern Nigeria is determined using modified Bond’s method using ‘reference ore’ Samples of iron ore were sourced using random method, reference minerals; marble and granite of known weight and iron ore of known weight were ground using the ,

Get PriceStandard bond grindability tests showed that microwave heating reduced the work index of iron ores by 10 to 24% When a continuous feed belt in a microwave applicator was used, samples heated more uniformly and quickly than in batch operations

Get PriceA grinding study was conducted of BOF, EAF, and LMF slags using the Bond Work Index method to determine grindability to 106μm Work Index values obtained ,

Get PriceThe Laboratory Comparative Work Index gives an approximate Bond Work Index for an ore sample This can then be used with Bond’s Third Theory of Comminution to calculate net power requirements needed for grinding The test depends on laboratory batch grinding and uses a comparison with the grinding of an ore of a known Bond Work Index

Get PriceIn the current research, a simple, fast and accurate procedure is introduced to find the rod-mill work index based on the conventional Bond work index The grinding experiments were carried out on four typical samples of iron, copper, manganese and lead–zinc ore with three test-sieves in specified time periods and aimed to shortening the ,

Get PriceIndonesia), have reacted strongly to the export ban relaxation, as there is concern that this policy will hamper recent improvements in global nickel prices, given that Indonesia was one of the world’s largest nickel ore exporters prior to the ban on the export of unprocessed mineral ores coming into force on ,

Get PriceOre dressing test mainly includes preparation before test, test process and test result Ore dressing test is an important technical basis for the construction and production of ore dressing plantBy determining the properties of raw ore, we could master the properties and types of ore and determine the recoverable valuable elements

Get PriceOct 24, 2018· The work index can either be measured in the laboratory (the Bond ball mill work index determination is a common example) or it can be calculated from the operating performance of ,

Get PriceJan 31, 2019· Bond work index studies were carried out for the BHQ and BHJ ores with different product fineness in order to evaluate the energy requirements in fine grinding A higher Bond work index value was found for the BHJ ore (154 kWh/ton) than for the BHQ ore (124 kWh/ton)

Get PriceTable I shows the Bond ball mill work index obtained for the ore samples as well as the iron and silica content in concentrate and tail after LIMS The concentrate weight recovery was in the order of 50–60% Furthermore it may be observed that the Bond ball mill work indices for the ore (Wi) varies from 146 to ,

Get PriceSep 22, 2006· grinding iron ore in ball mills The bond work index is used to determine the energy requirements of grinding balls in ball mills

Get PriceHigh grade iron ore resources are becoming depleted in Brazil, with relatively low-grade ores requiring more intensive comminution for proper liberati,

Get PriceThe 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 industrial ,

Get PriceThe work index of 2039 Kwh/s ton value obtained when granite was a reference ore is within the limit of work index of some iron ores in Nigeria (Weiss, 1965 and Thomas, 2007) 4 CONCLUSION AND RECOMMENDATIONS The study shows that work index of Birnin –Gwari iron ore can be taken as 2866 Kwh/ston ie

Get Price• Reduction of Bond Work Index (BWI) • Reduction of energy consumption of ball mill • Increase of throughput capacity Tertiary HPGR Freeport 7 Cerro Verde I, Copper ore, 108000 tpd 4 x POLYCOM 24/17 50 MW each In operation since: 2006 Cerro Verde II, Copper ore, 240000 tpd 8 x POLYCOM 24/17 In operation since: 2015

Get PriceDetermination Bond Work Index Of Iron Ore We have Determination Bond Work Index Of Iron Ore,The bond abrasion test determines the abrasion index, which is used to determine steel media and liner wear in crushers, rod mills, and ball mills bond developed the following correlations based on the wear rate in pounds of metal wearkwh of energy used in the comminution process

Get PriceIron ores are rocks and minerals from which metallic iron can be economically extracted The ores are usually rich in iron oxides and vary in color from dark grey, bright yellow, or deep purple to rusty red The iron is usually found in the form of magnetite (Fe 3 O 4, 724% Fe), hematite (Fe 2 O 3, 699% Fe), goethite (FeO(OH), 629% Fe), limonite (FeO(OH)n(H 2 O), 55% Fe) or siderite (FeCO ,

Get PriceThe infiltration of hydrothermal solutions through structures that form veinlets with different alteration levels and variations in physical strength, will influence the consumption of grinding energy during processing operations This research uses a gold ore vein sample from the Kutawaringin area, Bandung Regency The sample, analyzed in the field by microscopic analysis, was tested in ,

Get PriceA mill is a device that breaks solid materials into smaller pieces by grinding, crushing, or cutting Such comminution is an important unit operation in many processThere are many different types of mills and many types of materials processed in them Historically mills were powered by hand (eg, via a hand crank), working animal (eg, horse mill), wind or water ()

Get PriceThe Bond work index is not solely a material constant but is influenced by the grinding conditions For example, the finer the grind size desired, the higher is the kWh/t required to grind to that size Magdalinovic [38] measured the Bond work index of three ore types using different test screen siz He produced a correlation between the mass of test screen undersize per revolution, G, and ,

Get PriceTo participate in the 911Metallurgist Forums, be sure to JOIN & LOGIN Use Add New Topic to ask a New Question/Discussion about Grinding OR Select a Topic that Interests you Use Add Reply = to Reply/Participate in a Topic/Discussion (most frequent) Using Add Reply allows you to Attach Images or PDF files and provide a more complete input Use Add Comment = to comment on someone else’s ,

Get PriceThe work index of reference ore was used to calculate the work index of the test ore using Gaudin Schuman expression to obtain a work index of 1192kwh/ton for test ore This work index value obtained for Iperindo gold ore (test ore) lies favorably within the work index of 8 – 165kwh/ton for gold ore sighted in the literature

Get PriceJan 01, 2017· 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 ,

Get PriceBond Work Index an overview ScienceDirect Topics The Bond work index is not solely a material constant but is influenced by the grinding conditions For example, the finer the grind size desired, the higher is the kWh/t required to grind to that size Magdalinovic [38] measured the Bond work index of three ore types using different test screen sizes He produced a correlation between the mass of ,

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