TEST WORK qBond Work Index Testing Bond Ball Work Index Bond Rod Work Index Bond Crushability Work Index Bond Abrasion Work Index qJK Tech Testing JK Drop weight Test SAG Milling Comminution Test SMC COMMINUTION PILOT PLANT qAGSAG Pilot Milling Mill dimensions 17m x 06m length Typical throughput 05 35 th depending
A Bond Ball Mill Work Index may also be used in the simulation and optimisation of existing mills and the associated grinding circuits Sample Requirements A minimum of 8 kg of material crushed to nominally minus 10 mm is preferred JKTech would stage crush the sample to minus 335 mm as required for the Bond Ball Mill Work Index test feed
WiBM Bond Ball Mill Test Work Index kWht Wic Bond Impact Crushing Test Work Index kWht WioACT Actual Operating Bond Work Index determined from measurements on the circuit kWht WiRM Bond Rod Mill Test Work Index kWht WiSTD Standard Circuit Bond Work Index expected or designed used for circuit design Specific energy requirement at
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 2006This 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
Jul 31 2014 Wm Wi 80P 10 80F 10 1 where Wm is mill specific motor output power kWht Wi is the Bond ball mill work index kWht P80 is sieve size passing 80 of the mill product m F80 is sieve size passing 80 of the mill feed m The efficiency factors Rowland 1975 modify equation 1 so that it caters for circuit
XMGQ305 Grinding Bond Ball Rod Mill is mainly applied for testing the grinding work index of the material of every kinds of ores slag etc Pilot Ball Mill we design and produce the pilot ball mill for mining and mineral processing Lab Cylinder Ball Mill
Wi Bond Work Index Ws Specific energy correction for size distribution kWht WiBM Bond Ball Mill Test Work Index kWht 3 KEYWORDS Autogenous Grinding AG Ball mill Bond Work Index Wi Comminution circuit High Pressure Grinding Rolls HPGRs Rod mill SemiAutogenous Grinding SAG Specific energy W 4 INTRODUCTION AND BACKGROUND
work index covering grinding of fine particles is labelled M ib Morrell 2008 M ia values are provided as a standard output from a SMC Test Morrell 2004 a whilst M ib values can be determined using the data generated by a conventional Bond ball mill work index test M ib is NOT the Bond ball work index M ic and M ih
Grinding Mill Circulating Load For Ball Mill Xsm Grinding mill xsm grinding mills vary from coarse grinding medium grinding to micro fine ng millgrinder millis widely used in metallurgy building materials chemicals mining minerals in areas such as grinding materials materials include line calcite barite coal gypsum mica and bentonite powder
Besides the results of work index tests are accordingly implemented in Equation 5 to calculate the ore work index values Equation 5 is similar to Bond work index equation but it has been defined for the foregoing calibrated bond ball mill 15 P F P G Wi i i 10 10 1176 1 1 230 75 u u 5 Where W i Bond laboratory ball work index kWhst
The Bond Ball Mill Grindability Test determines the Bond Ball Mill Work Index used to determine net power requirements when sizing ball mills The test is a closedcircuit dry grindability test It is run in a standard ball mill and can be performed at mesh sizes ranging from 48 mesh to 400 mesh Bond Ball Mill Work Index and modified
Table 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 5060 Furthermore it may be observed that the Bond ball mill work indices for
Bond Work Index Ball Mill BWi The Bond Ball Mill Work Index BWi is used to calculate the power requirements to grind ore to a typical ball mill product Table 3 shows the BWi for each composite Table 3 Bond Ball Mill Work Index Sample ID Closing Screen Size m F80 m
cycle test akin to the Bond Ball mill work index determination The first cycle starts with minus 6 mesh ore removed since it is believed that the fines content can fill most of the voids allowing little room for rock breakage and piston movement Without adequate piston
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
For overflow ball mills the charge should not exceed 45 of the mill volume For grate discharge mills the charge should occupy about 50 of the mill volume Bond developed a relationship that can be used to determine the percent charge by volume as a function of the vertical height above the charge He and the radius of the mill R ie
The Bond ball mill work index test is thought to be additive because of its units of energy nevertheless experimental blending results show a nonadditive behavior 18 The SPIR value Get Price Comparison Of Ucs To Bond Work Indices
grams per revolution Gbp is the ball mill grindability The ball mill work index Wi kWhshort ton is calculated from the following equation Bond 19611 The mill should be cleaned by either blowing air into it or wiping the interior with a cloth and or brush The FC Bond ball mill
TEST WORK qBond Work Index Testing Bond Ball Work Index Bond Rod Work Index Bond Crushability Work Index Bond Abrasion Work Index qJK Tech Testing JK Drop weight Test SAG Milling Comminution Test SMC COMMINUTION PILOT PLANT qAGSAG Pilot Milling Mill dimensions 17m x 06m length Typical throughput 05 35 th depending
Oct 19 2017 Bond formula for the grinding balls size calculation October 19 2017 Archive 0 The enterprises consumers grinding media have a question about right choise the grinding ball size diameter for the mill in order to achieve the required grinding quality
Bonds approach consists of determining the ore hardness characteristics or Work Index Wi via standardized laboratory testwork The full suite of Bond comminution tests provide the Ball Mill Work Index BWi the Rod Mill Work Index RWi the Crusher Work Index CWi and the Abrasion Index
Use of Work Index Since its introduction in the 1960s the Bond Ball Mill Work Index BBMWi parameter has been extensively used in predicting ball mill power draw Along with comminution circuit design the work index parameter is widely used in tracking mill performance Due to the age and lack of controls for the test many
FIGURE 8 ROD MILLBALL MILL WORK INDEX RATIO v UNCONFINED COMPRESSIVE STRENGTH 100 200 300 400 UCS MPa 0 05 1 15 2 WiRMWiBM metric Siddall et al 1996 identified the ratio of Bond rod mill Work Index and ball mill Work Index as being indicative of an ores compentency Figure 8 plots this ratio versus UCS no trend is apparent
The Bond Ball Mill Work Index provides a measure of how much energy is required to grind a sample of ore in a ball mill The following table indicates some typical figures and a relative measure of what they mean Property Soft Medium Hard Very Hard Bond WI kWht 7 9 9 14 14 20 20
The Bond rod mill work index is not as common as the Bond ball mill work index and there are two different variations on the mill models expect a mill with a wave liner and is not compatible with mills using smooth liners
The Bond lowenergy impact crushing work index more informally the Bond crushing work index is not as common as the Bond ball mill work index and it is a notoriously noisy test The test is a perspecimen test where individual specimens of prepared rock are handpicked by the test operator and placed into the apparatus
Oct 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
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 Bond Impact Crushing Work Index Specific Gravity Advanced Terra Testing Inc ATT
22 Ball Mill Batch Process The mill dimensions D L are 0204 0158 m and it is loaded with 65 kg steel balls between 25 and 32 mm in diameter The mill rotates on rolls and its frequency is set to 70 RPM 1667 Hertz corresponding to 85 of the critical frequency The mill power is P 162 Watts
Ball Mill Closed circuit crushing to 16 mm Open circuit 8 dia rod mill to 1 mm Closed circuit 8 dia ball mill to P80 um The ore Test Work Index Circuit Operating Work Index 9 The Standard Bond Circuit Coarse Ore Bins Fine Ore Bins Screen Crushing Screen Classification Rod Mill Ball Mill THIS IS THE REFERENCE BASIS FOR ALL WORK INDEX
21 CONCLUSIONS Continued In the present work equations were also derived giving zthe ballmill power drawP as a function of its dimensions internal mill diameter D and length L zthe ballmill power drawP as a function of the feed D f mm and the product size d mm the Bond work index w i kWhshort ton and the mill throughput T short tonh zthe ballmill dimensions D and L when
3 STANDARD BOND TESTS The Bonds standard ball mill is used to determine the work index value of differ ent samples The Bond work index is defined as the kilowatthours per short ton required to break from infinite size to a product size of 80 passing 100 m If the breakage
from 14 to 34 kWht and Bond ball mill work index values vary from 6 to 24 kWt for the same ores Project design tonnages varied from 200 to 150000 td SAG mill sizes varied from 10 ft to 40 ft diameter in multiple SAG mills and ball mill sizes varied from 7 ft to 27 ft in diameter
the different faces of quarry Bond work index of limestone Face4A results less than 20kwht remaining 6 samples are marked as hard rock because of high energy consumption and low grindability rate Index Terms Ball mill Bond Work Index Comminution Grindability Liberation Limestone Ultra
Bond Test WIs kWht Rod Mill Ball Mill 95 kWht8 9 kWht Bond Standard Circuit Work Index Assume the rod mill Work Index of 95 applies from the actual rod mill feed sizeof 19300 m although some of this work might ideally be done by crushers to achieve a rod mill F80 of 16000 m to a rod
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