rocks which are in general associated in bauxite mining such as Partially Altered Khondalite PAK rocks Partially Keywords Brittleness Friability value Hardgrove index Bond 39 s work index PLK rocks Bauxite mine waste Six chosen typical samples have posses a wide range of colours Fig 1 The colours vary from

A Bond Ball Mill Index Test BBMWI is a standard test for determining the Ball Mill Work Index of a sample of ore The BBMWI is a measure of the resistance of the material to crushing and grinding It can be used to determine the grinding power required for a given throughput of material under ball mill grinding consitions

encompassed a range of ore UCS from less than 50 MPa to over 300 MPa Graphs were visually interpreted and only if FIGURE 2 BOND CRUSHING WORK INDEX v UNCONFINED COMPRESSIVE STRENGTH ordered by mine 0 100 200 300 400 UCS MPa 0 10 20 30 40 50 60 WiC metric Aus Aus Africa

1 Jan 1989 A wide range of values was found but most of them were grouped around 198 x 10 7 The Bond grindability test the Bond Work Index and Council for which is now the site of the operations of the Black Mountain Mine The Witwatersrand gold ores are noted for their relative uniformity of composition

3 Citations A specially designed laboratory model of a universal Hardgrove mill was used to study the grindability and Bond work index of a wide range of bauxites and other alumina bearing ores A single method was used to obtain reference values of the Bond work index of bauxites from most of the mines in the world

A Methodology to Estimate Ores Work Index Values Using Miduk Copper Mine Sample M Noaparast1 S Rahmati1 G Jozanikohan1 S Aslani1and A Ghorbani1 1School of Mining Keywords Modeling Work Index Miduk Copper Control Screen Bond Ball Mill were collected in the angular range 4 70 2θ with a nbsp

Hazen Research Inc Bond Rod Mill Work Index Bond Abrasion Specific Gravity 2 methods JK Drop Weight Tests – Data Analyzed by Contract Support Services Inc Phillips Enterprises LLC mine or in a dry crushing circuit but for grinding calculations where the ore is in continuous contact with water the nbsp

The value of 20 39 Kwh short ton was selected as it is within the range indicated by previous research work on iron ore in Nigeria Onemine 2009 The determination of work index using modified Bond 39 s method can be compared to method of determining it by Berry and Bruce 1966 This method requires the use of a nbsp

The Journal of The Southern African Institute of Mining and Metallurgy VOLUME 110 NON REFEREED PAPER However Bond 39 s Third Law can be reasonably applied to the range in which ball rod mills operate in Table I shows the Bond ball mill work index obtained for the ore samples as well as the iron and silica nbsp

Similar to a Comparative Work Index this test is an open circuit dry batch grindability test run in the standard Bond Ball Mill for a set time It can be used at mesh sizes from 65 to 200 mesh normally 100 mesh The test requires calibration against the standard Bond Ball Mill Work Index test to estimate the Work Index

According to a report by the Coalition for Energy Efficient Comminution grinding and crushing ore accounts for 53 per cent of an average mine site 39 s energy Using the comminution measurement approaches of the Bond Work Index and the Morrell method the surveying and sampling guideline details methods to survey nbsp

š Barratt Doll method based on the Bond work index es 3 š JK Drop Weight SMC developed by JKMRC 4 š Starkey 39 s method SAGDesign SPI 5 Each of the listed methods includes a series of labora tory disruptive tests with special purpose equipment and a set of empirical equations for estimation of mill power suffi

The work index series ball mill rod mill and MacPherson autogenous and pilot plant tests require relatively more weight for a given top size because they are run until a steady state is achieved which involves replacing the mill charge several times throughout the test The Bond tests are typically run for a minimum of

Quantifying ore characterization is integral to any mine project development Over the comminution parameters such as JK drop weight and Bond tests for Batu Hijau operation In their work Wirfiyatal and McCaffery 2011 commented on the The Axb ranges from 17 3 54 2 for the high scatter low RQD sample and

the mining engineering and financial sectors for all major commodities exploration and mining companies Our processes Comminution ALS Metallurgy offers a comprehensive range of crushing and grinding testwork services Autogenous media competency Bond abrasion index Bond ball mill work index

22 Sep 2017 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 lt 1 2″ ore samples in a Ball Mill using a standard ball charge Below describes in general terms the nbsp

19 May 2015 and mine scheduling allows for higher flexibility in response to changes in the plant feed when mining different parts In order to determine the several tn curves five different initial particle sizes in the range of 13 2 to From the grinding test the Bond ball mill work index Wi in kWh t is determined 38

Highland Valley Copper recently implemented a system of measuring run of mine ROM ore properties and monitoring their effect on both Bond Grindability Test for Bond Work Index JKMRC 1996 pp 50 81 calibration the Work Index values between 0 and 100 should represent the full range of rock hardness that

The relation between work index and also ball size with d80 were linear over the studied range where Wi is the work index of ore kWh t Pi test sieve size at which the test is performed Gbg Bond 39 s standard ball mill grindability net weight of ball mill product passing sieve size Pi produced per mill revolution g rev nbsp

Estimated electricity requirements for mining beneficiation smelting and refining for copper oxide ores and sulfide Estimates of electricity consumption can be applied to a wide range of analyses For example the tables delivered to the crusher 3 crushing and grinding characteristics such as Bond work index 4 nbsp

In the 1930s through early 1950s Bond developed a new theory of comminution that introduced an index called the 39 Bond Work Index 39 which relates power consumption in crushing and grinding to the feed and product size distribution His theory and index were introduced in a widely nbsp

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 tu by 1989N in Types gt Research grinding and mineral processing

22 Sep 2017 Avg Bond Work Index kWh t kWh t kWh sh t kWh t kWh t kWh t kWh t Range No of Tests Alumina 17 9 7 34 6 Andesite 20 1 18 3 20 1 19 5 Barite 6 3 4 7 5 2 5 0 5 8 4 9 7 Basalt 18 9 17 1 18 8 19 0 19 0 Bauxite 9 7 9 5 8 8 9 7 10 0 10 0 14 5 1 31 29 Cement clinker 15 0 13 1 13 5 nbsp

has been worked out for the determination of the Bond work index The comparisons of the test results of six ore samples showed that mine the work index of these ore samples The purpOSe of this research Suppose the size distribution of ore flows in the system ranges from 0 to xm mic ron use a set of n screens with a nbsp

Internationally accepted mineral metallurgical standard test procedures to determine the physical properties of ores include the Bond ball mill work index and the As with our standard range of ball and rod mills the Essa bond index ball mill and bond index rod mill are supplied standard with a barrel and rotating yoke nbsp

This work presents the results of the Bond work index in a ball mill on samples of carbonate mi neral raw material indicate that in 4 samples of limestone the value of the Bond Work Index is in the range of 5 9 to 6 4 kWh t Mining an d Metallurgy Institute Bor e mail sanja bugarinovic irmbor co rs This work is the nbsp

The determination of work index of Enyigba Lead Ore Ebony State using the modified bond energy Berry amp Bruce method was investigated and confirmed to be within the range indicated by previous research work on lead ore Keywords Taraba State However lead zinc mining in Nigeria has been rather intermittent

compressive strength and modulus of elasticity and the bond work index of these different size ranges According to Eq 1 comminuting energy is estimated based on experimental methods rather than rock mechanical properties 3 In most mining operations blasting crushing and grinding are necessary parts

8 8 Slurry pumps – range XR and VASA HD For soft feed and non abarasive feed low Bond work index a horizontal Impactor HSI is an option if the capacity is not too high For harder feed there is a mining applications comprising secondary crushing sand manufacturing and fine crushing of ore prior to leaching

Bond 39 s work index has generally been accepted as a measure of the grindability of an ore This study used The Bond 39 s work index of Baban Tsauni Nigeria ore was found to be 11 52kWh tonne Keywords Grindability comminution energy mineral comparative This choice was aimed at working within the range

11 Aug 2016 Abstract The Bond work index is a measure of ore resistance to crushing and grinding and is determined using the Bond grindability 2 ranges from 1 077 to 1 239 For three grindings cycles 3 ranges from 1 047 to 1 145 For four grinding cycles 4 ranges from 0 998 to nbsp

22 Sep 2017 What is the Bond Work Index Formula Equation In case you had forgotten here is a classic You can read all the details of this now Biblical grinding power requirement calculation formula in Fred Bond 39 s original paper You can also review the step by step Bond Work Index Test Procedure I posted here

Most widely used parameter to measure ore grindability is the Bond work index Wi that is described in previous paragraph Berry and Bruce 1966 developed a comparative method of determining the grindability of an ore The method requires the use of a reference ore of known grindability The reference ore is ground for nbsp