The Bond ball mill work index is one of the most commonly used grindability tests in mining, and is often referred to as the Bond work index. ... Convert to µm, if needed, before entering into the database. F 80: Sample feed size in µm (and usually will provide a particle size distribution)
GLOBALLY RELIABLE DETERMINATION OF BOND BALL MILL WORK INDEX JK Bond Ball Mill Test The JKBBM test was developed at the Julius Kruttschnitt Mineral Research Centre JKMRC.
bond ball mill work index database jktech . ... JK Bond Ball Mill TestJKTech An improved method using less mass compared to the Bond Ball Mill Work Index test JKTech Pty Ltd P 61 73365 5842 E email protected CRICOS Provider 00025B W jktech Development and Initial Validation The JKBBM test was developed at the Julius Kruttschnitt Mineral ...
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.
Ball mill work index. ... Update Public Grindability Database Dec 25, 2020 ... P80 of Bond ball mill Work Index tests Dec 4, 2020 Which particle size distribution model to use?
A database of 336 Bond ball mill work index results generated by commercial laboratories and by the authors was used to generate Fig. 1. Tests with F 80 values finer than 2 mm were excluded, resulting in a calibration data set with the following statistics: • n: 267 • mean: 2505 µm, median: 2508 µm • standard deviation: 226 µm
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.
historical database which includes resu lts of over 5,000 drop weight charac terizations ... JKTech. (2018). JK Drop Weight Test. ... The most commonly used measure is the Bond ball mill work ...
Sep 2007 Nov 20136 years 3 months. 40 Isles Rd, Indooroopilly, Queensland, Australia. 03/2012 11/2013: Geometallurgical consultant (for mineral processing and automated digital. mineralogy) at JKTech in Brisbane (Australia):
The basic parameters used in ball mill design (power calculations), rod mill or any tumbling mill sizing are; material to be ground, characteristics, Bond Work Index, bulk density, specific density, desired mill tonnage capacity DTPH, operating % solids or pulp density, feed size as F80 and maximum 'chunk size', product size as P80 and maximum and finally the type of circuit open/closed ...
GLOBALLY RELIABLE DETERMINATION OF BOND BALL MILL WORK INDEX JK Bond Ball Mill Test The JKBBM test was developed at the Julius Kruttschnitt Mineral Research Centre JKMRC#8230;
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.
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 mill performance.
Figure 1 shows a histogram of Bond ball mill work index frequency from MacPherson Consultants (ARMC). This database covers a fraction of all the tests performed by ARMC over the years and around the world. It shows that the ball mill work index is normally distributed with an average of and a median of kWh/t. bOnd rOd mill ...
Where, WioACTis the Actual Operating Bond Work Index (kWh/t), W is the specific energy input (kWh/t), P80 is the 80% passing size of product (µm), and F80 is the 80% passing size of circuit feed (µm). 2. Calculate the Standard Circuit Bond Work Index (WiSTD) for the material being processed (equation 3). Wtotal
Figure 13 Example of Bond rod and Bond ball mill grindability test product for the same ore and feed size distribution. For ores that have excessive fines, a modified Bond grindability test is required. This is because, the fine in the feed may bias the Bond milling work index.
A Bond laboratory ball mill work index test was conducted using a closing screen of 150 m which gave a P80 of 108 m. A calculation is required to be carried out to estimate the specific energy ...
In conjunction with the Bond ball mill work index they can be used to accurately predict the overall specific energy requirements of circuits containing: ... These values can be used to simulate crushing and grinding circuits using JKTech's simulator JKSimMet. Figure 1 Measured vs Predicted Total Comminution Circuit Specific Energy ...
Methods to Estimate AG/SAG Mill Grinding Power Requirements. (1) Using the results of SMC data. (2) Using SAG Power Index (SPI) data. (3) Using the 1989 Barratt method updated on Alex Doll's Web site (February 16, 2015) (3) Using Don Burgess' method (11th Mill Operators Conference 2012) They seem to give very different predictions for ...
Standard drop weight, SMC, and Bond ball work index tests have been conducted to investigate the comminution circuit of a magnetite ore located in Eastern Hebei, China. In addition, simulations based on JKSimMet and Morrell models have been performed to compare the specific energy consumption of various comminution circuits. According to the desired capacity and the ore communition ...
The ore is locally known as "soft ore", with a Bond ball mill Work Index of kWh/t, and the breakage characteristic parameter A = and b = determined with a drop weight tester (NapierMunn et al., 1996). The ore sample was prepared using a jaw crusher and a rotary divider to obtain the identical subsamples for each test.
ComminutionBond Abrasion IndexBond Crusher Work IndexBond Ball and Rod Mill IndexJKTech Sag Mill Comminution (SMC)JKTech Drop Weight Testing (DWT)UCS Unconfined Compression StrengthIsaMill Ultra Fine GrindingGravity Separation Shaking TableKnelson / Falcon ConcentratorsTBE Heavy Liquid SeparationSpiral Bulk Pilot PlantMagnetic SeparationDavis Tube Recovery (DTR)Wet Low ...
SMC/JK Drop Weight and Bond Ball Mill Work Index tests. ... (JKTech, 2012) is . presented in Figure 4. ... block model which has been populated with ore characterisation data derived from Bond ...
The model is based on mechanistic models of blast fragmentation, crushing, milling, and classification. The inputs to the model are the proportions and main characteristics of the defined ore domains and their proportions ( Rock Quality Designation (RQD), Point Load Index (PLI), Bond Work Index, lithology, design and operating conditions).
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 ...
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 ...
Specific Gravity Advanced Terra Testing, Inc. (ATT) Unconfined Compressive Strength ASTM D 5731 Specific Gravity, ASTM D 854 Dawson Metallurgical Laboratories, Inc. SAGDesign (SAG to T80 12 M followed by Bond BM Wi on SAG ground ore) Bond Ball Mill Work Index (Crushed Feed)
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 grinding and can be used to determine the grinding power requirement for ball milling.
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 ...
the relative grindability of different ores in ball milling (Bond, 1961 and Rowland and Kjos, 1980) To use the Bond ball mill work index to determine the ball mill specific energy required for a particular grinding task, the Bond equation must be used and the various relevant efficiency factors applied. In
bond fc crushing and grinding calculations Crushing and Grinding and Grinding Calculations Parts I and II,British,Vol 6 and
Point Load Index Database Corrections. ... 2 WiC = Bond Crusher Work Index, Wibm = Bond Ball Mill Index and Wirm = Bond Rod Mill Index ... the JKTech drop weight test Axb result versus poin t load ...
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