These "errors" in the Bond test are often underappreciated in design, and the results are discussed in the context of implications for mill sizing. Other major factors that drive ball milling efficiency, which are not accounted for by the Bond equation but are strongly evident in the JKTech database, are also presented.

JKTech Comminution Analyst Matt Weier will be travelling to Santiago for Procemin 2018 to present his paper Accuracy of the Bond Ball Mill Test and Its Implications. ... Since first being introduced by F Bond in 1952, the Bond Work Index, derived from the Bond Ball Mill (BBM) Test, is a measure of the resistance of the material to crushing and ...

The standard Bond ball mill work index test is conducted under dry milling conditions. For ores with Bond work indexes greater than 12 kWh/t, dry locked cycle tests are suitable as they have low difference in hardness between wet and dry milling.

Note that products from the SMC Test can be reused for other laboratory tests, such as Bond ball work index testing. STEP 2 ... Mih and Mic. In conjunction with the Bond ball mill work index they can be used to accurately predict the overall specific energy requirements of circuits containing: AG and SAG mills, Ball mills, Rod mills, Crushers ...

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 values are also provided as a standard output from a SMC Test ® (Morrell, 2009). The general size reduction equation is as follows (Morrell, 2004 b): (( 2 ) (1))4 2 1 f x f x Wi = Mi x − x (1) where

Bond Ball Mill Work Hardness Jktech. Jk Bond Ball Mill Test Jktech. JK Bond Ball Mill Test Since its introduction in the 1960s, the Bond Ball Mill Work Index (BBMWi) parameter has been extensively used in predicting ball mill power draw. Use of Work Index Along with comminution circuit design the work index parameter is widely used in tracking ...

The Bond ball mill work index test has been used for ore hardness characterization for more than 80 years. Nevertheless, the test suffers from significant disadvantages when compared with other

In conjunction with the Bond ball mill work index they can be used to accurately predict the overall specific energy requirements of circuits containing: AG and SAG mills, Ball mills, Rod mills, Crushers, High Pressure Grinding Rolls (HPGR). ... These values can be used to simulate crushing and grinding circuits using JKTech's simulator ...

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. values are also provided as a standard output from a SMC Test ® (Morrell, 2009). The general size reduction equation is as follows (Morrell, 2004. b): f x f x 2. 1 i i. 4 2 W M x x. 1 (1) where ...

Ore hardness can be estimated using commercially ... by up to 714% and that the Bond Ball Mill Work Index may be reduced by up to 39% depending on the ore type under investigation ...

associated values reported in the literature for Bond's ball mill work index and is far superio r to those reported for Bond's rod mill and crushi ng work inde x tests ( An go ve and Dunne, 1997)

Bond Ball Mill Work 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 for material under ball mill

Several authors have developed simplified tests to predict ball mill's energy consumption, typically using the Bond Ball Mill Work Index (BBMWI) as a reference. One option requiring less mass is the Hardgrove mill, traditionally used in the laboratory to determine the energy required to grind coal in roller mills.

An improved method using less mass compared to the Bond Ball Mill Work Index test. The JK Bond Ball Mill (JKBBM) test, is a locked cycle grindability test conducted using a standard laboratory Bond Ball Mill with the same steel ball charge and material feed size (100% passing mm) as the Bond Ball Mill Work Index test.

Cleaning and Storing of Ball Mill Charge after the Bond Work Index Procedure is done: Add about 500 g of silica sand into the mill containing the ball charge. Seal the mill. Rotate for 20 revolutions to clean. Empty the mill charge and sand into the ball try once grinding is complete. Clean out the mill using a brush. Put the lid on the mill.

work index series (ball mill, rod mill, and MacPherson autogenous) and pilot plant ... Bond Ball Mill Any 10 5 Lockedcycle Y Y Mod Bond Any N/A 2 Batch N Y Table 1 Summary of Grindability Test Procedures ... low ball mill hardness, while low ratios represent friable or coarsegrained ores.

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 ...

JKTech. Laboratory Services, Australia. ... The most commonly used measure is the Bond ball mill work index (BBMWi). ... Underestimation of ball milling feed hardness increases the risk of ball ...

After offering the JK Bond Ball Mill (JKBBM) Test in house for some years, and with over 500 tests performed, JKTech is pleased to announce the JKBBM is now available to be licenced to other commercial laboratories.. Initially developed and validated by researchers at the Julius Kruttschnitt Mineral Research Centre (JKMRC), the JKBBM Test reduces the time, sample (approximately 50%) and cost ...

Standard Bond ball mill grindability tests and calibrated Mod Bonds, using a closing screen of 270 mesh (53 microns), classified most samples as medium to moderately hard and averaged kWh/t (Mod Bond only). The SPT lockedcycle high pressure indices (HPi) ranged from kWh/t to kWh/t averaging kWh/t.

Bond Ball mill work index results ranged from to kWh/t, which is considered as "soft to average" hardness in terms of ball milling energy requirements. Flotation Test Results

The use of commercially availability of these balls could facilitate the standardisation of the Bond grindability ball mill tests. Results of the Bond Work grindability tests with six pure materials of distinct hardness's (Mohs hardness 3 to ), crystallographically competent (free of intercrystalline contacts and inclusions) and distinct ...

samples and perform the rod mill test on the samples blend. Bond Ball Mill (BBM) Standard Test The procedures to carry out the Bond grindability tests in ball mills and rod mills are outlined in They are usually referred to as the standard tests, but it must be highlighted that the procedures haven't been defined by ...

An addition to reporting A and b valuesThe SAG Circuit Specific Energy (SCSE) For a little over 20 years, the results of JK Drop Weight tests and SMC Tests have been reported in part as A, b and ta parameters. A and b are parameters which describe the response of the ore under test to increasing levels of input energy in single impact breakage. A typical t10 v Ecs curve resulting from a Drop ...

SMC Data Processing. The results from conducting the SMC Test® are used to determine the dropweight index (DWi) which is a measure of the strength of the rock as well as the comminution indices Mia, Mih and Mic. In conjunction with the Bond ball mill work index they can be used to accurately predict the overall specific energy requirements of ...

The ability to simulate the Bond work index test also allows examination of truncated ball mill feed size distributions on the work index. For grinding circuits where the feed to a ball mill is sent directly to the classifier and the cyclone underflow feeds the ball mill (see Figure ), a question arises as to whether this practice will alter the ball mill work index (BW i) of the material ...

JK Bond Ball Mill Test; Our flotation ore characterisation test is the JKTech Floatability Index (JKFi) Test. JK Drop Weight Test and SMC Tests® are licenced to 48 metallurgical laboratories globally. To date, over 55,000 JKTech accredited A x b tests have been completed across more than 32 different commodities.

different ores in AG/SAG milling in exactly the same way as the Bond laboratory ball mill work index can be used to compare the relative grindability of different ores in ball milling (Bond, 1961 and Rowland and Kjos, 1980). However the originally reported A and b parameters which match the SCSE will be still be

Bond Ball Mill Work Index JK Bond Ball Mill Test Point Load Test High Pressure Grinding Rolls Steel Wheel Abrasion Test Corrosion Test Comminution Testing Flotation Testing Hydrocyclone Testing Mineralogical Assessment