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2020-5-14Bonds work defined the relationship between ore hardness tonnage processed sie reduction achieved and power required. It set the standard for circuit design in the 1950s and it is widely used today although modifications have been made to handle the large increases which have occurred in mill sies feed sies and feed rates
1. Introduction. A Bond Ball Mill Work Index test is a standard test for determining the ball mill work index of a sample of ore. It was developed by Fred Bond in 1952 and modified in 1961 JKMRC CO. 2006.This index is widely used in the mineral industry for comparing the resistance of different materials to ball milling for estimating the energy required for grinding and for ball mill
2015-12-16may be caused by a variation in ore hardness by sie 12.5mm for RWI and 3.35mm for BWI andor grain sie properties. The Bond rod mill work index is used to calculate the power requirement at intermediate sie i.e. from 12.5mm to about 1mm. The test has been mainly used for the design of rod mills or primary ball mills but it can also be used
Iron ore material was preheated for different time at 1000W in a multi-mode microwave oven. Comparative bond rod mill work index was used to determine the effect of this process on the grinding energy required for sie reduction of the material in a laboratory rod mill
Mills Technical Data. The following technical data sheets show some of the standard Ball Mills and SAG Mills that we have available.. We can supply Ball Mills SAG Mills and other milling systems to your specific requirements given your particular technical specifications.. The selection and type of mill you require FAG SAG SABC rod or ball is at best difficult and depends on ultimately
Product sie is a material property that needs to be determined for different ore deposits. The Bonds work index has generally been accepted as a measure of the of an ore. grindability This study used quart as a reference ore via a comparative method to determine the Bonds work index of Baban Tsauni Nigeria ore
2018-2-20respect to the effect of ore hardness circuit efficiency grind sie and feed grade. The first energy curve shows the impact of ore hardness as assessed using the Bond work index comparative methodology. Both the Bond work index BWi and the operating work index OWi are presented as separate overlayed curves Figure 1. The BWi is an
Bond ball mill work index Bond Work Index Formula-Equation See this useful summary Table of Bond Work Index by Minerals 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 sie
2017-2-1Bond procedure is followed the Bond work index is relatively consistent anywhere in the world and should be very repeatable 4. Figure 1 shows a histogram of Bond ball mill work index frequency from A.R. MacPherson Consultants ARMC. This database covers a fraction of all the tests performed by ARMC over the years and around the world
2016-4-259517 .m6 f57 1987 final report for minnesota department of natural resources moa no. 14-09-0070-1260 magnetic belt cobbing technology for upgrading
2011-7-5effective recycle mass in proportion to fresh feed for an initial feed top sie of 35 mm. Ultimate product sie is 80 0.8 mm with up to 60 74 m at a specific power consumption of 1.8 to 2.2 kWht. 1.0 LOS COLORADOS OPERATION IRON ORE The crushing and pre-concentration plant is located near the mine. After rail transport to the
2018-12-15obtained from a local quarry. Bond work index testing conducted in these test programs confirmed the sample was relatively hard and comparable to many mineral ores. The sample was pre-screened using a Russel vibrating sieve with a 10 mm aperture sie and the oversie was stage
2015-1-212. Bond Impact Crushing Work Index CWi 3. SAG Mill Comminution SMC 4. Bond Abrasion Index Ai 5. Bond Ball Mill Work Index BWi III. Magnetite Recovery Test 1. Davis Tube Recovery DTR 2. Davis Tube Wash DTW 3. Grind Establishment Test 4. Coarse Liberation Test using ERIEZ L8 separator 5. Grind Sie Optimiation Test using ERIEZ L8
2016-7-29crystalline ore. It is not known what work or energy will be required to crush the rock and what grind sie will be required to liberate the iron from the ore at this stage. A purpose fit processing route will need to be developed through ongoing metallurgy. However Athena is confident experiments can be developed to understand the ore how to
This is highlighted by the Bond Work Index a metric that gives in kWht the electrical power needed to grind the ore to a standard sie. Magnetite mined from the Pilbara typically has a Bond Work Index of 20 kWht whereas most South Australian projects expect to see values 10 kWht
2020-4-30From an ore hardness and comminution perspective the majority of South Australian magnetite ores have a rock strength classified as soft to medium with Bond crushing work index CWi values typically 1020 kWht abrasion index Ai values 0.20.6 majority 0.5 and Bond ball mill work index BWi values 1119 kWht
Crushing and grinding processes have undergone significant changes over the last 20 years. These adjustments have focused on lowering costs and increasing production and energy efficiency mainly
2017-1-16 The best operating condition is P80 45 micrometers. At this grind sie the highest iron recovery and grade to magnetic concentrate was obtained. The Bond ball work index at 150 micrometers is 10.9 kWht. This is in the soft range of hardness. The Bond ball work index at 45 micrometers is 12.6 kWht. This is in the moderately soft
Work input and grindability for the ball mill using the above mentioned of ore grindability are the Bond Work Index. The Bond test work index BWi on the same ore when tests are . dolomite iron ore coal and lienithne by using a variac. Read More
Iron ore processing and sale of equipment needed is provided by And its widely used in many practical fields learn more Iron Ore . is the right learn more Garnet Crushing Plant We also style a complete crushing and screening plant for aggregate gravel sand mineral ore in line with the specifiions of buyers. bond work index and grind
2017-9-13Wi Bond Work Index of the ore Cs fraction of the critical speed and D diameter of the mill inside liners m. Equation 1 demonstrates that larger balls are required to break larger particles. If the feed to a fine grinding mill contains large particles then large balls will
The target grind sie of the circuit varies between the 90 - Bond rod mill work index BRWi kWht 17.7. Bond crushing The iron ore in Akunu occur within the subsurface and were found
A higher Bond work index value was found for the BHJ ore 15.4 kWhton than for the BHQ ore 12.4 kWhton. A decrease in the product particle sie was associated with an increase in the work index value. Single-particle breakage experiments were designed by varying feed particle sie
2020-3-24Feed Sie Distribution o F. 80. from the t. a. relationship given in the equation below. The feed sie distribution is taken from the JKTech library of typical feed sie distributions and is adjusted to meet the ore specific 80 passing sie predicted using the Morrell and Morrison 1996 F. 80 t. a
2017-7-9Determination of Bond Work Index of Lucky Cement Limestone Pakistan Nia Muhammad Shahani Zhijun Wan Abdullah Rasheed Qureshi Muhammad Ali Naseem Ali AbstractThe Bond work index is a research methodology which is widely used for the estimation of power required to grind
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