Validation done by reanalysing database results shows results within % agreement on average. Improved method using less mass compared to the BBMWi Test. Development and Initial Validation. 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 ...
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• Grindability as indicated by the bond ball mill work index (BWi) ranged from 1035 kWh/t, with the majority between 15 and 27 kWh/t. No clear relationships in terms A*b and/or BWi was identified with geological aspects logged from the drill core such as weathering, lithology, alteration, alteration intensity, veining or combinations of these.
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.
bond ball mill work index database jktech Raymond . bond ball mill work index database jktech. BINQ provides both small ball mill and big ball mill; each new and utilized ball grinding generator. For medium natural .
bond fc crushing and grinding calculations Crushing and Grinding and Grinding Calculations Parts I and II,British,Vol 6 and
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 ...
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.
The SMC Test database spans over 1,900 orebodies, 100 countries and 47 different commodities ranging from copper, gold, and iron to diamonds and rare earths. ... 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 ...
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
Keywords: Ball Mill Work Index, Bond Index, Grindability, Ball grinding, Ore testing, Grinding energy consumption, Physical and mechanical ore properties.
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 ...
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 ...
Ausgrind contains a database of operating data and circuit types from many operations and over a wide range of ore types and throughputs. ... Bond ball mill work index kWh/t . Ball volume ...
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.
The power required by the ore to achieve a desired size is estimated using the standard Bond ball mill work index from a testwork program. This work index is used much as described in the original Bond method except that the feed rate and F80 to the Bond calculation is adjusted to compensate for a SAG Project 0002 3
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 <1/2″ ore samples in a Ball Mill using a standard ball charge.
For comparison purposes, Figure shows the measured values of the variability samples plotted in the Bond Ball Work Index database. ... This site uses cookies. Some of these cookies are essential to the operation of the site, while others help to improve your experience by providing insights into how the site is being used.
Over the last decades, several reliable mathematical models have been developed for simulating ore comminution processes and determining the Work Index. Since Fred Chester Bond developed the Work Index standard procedure in 1961, numerous attempts have been made to find simpler, faster, and economically more advantageous alternative tests.
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 size to 100 um. The sample was received crushed appropriately for the ball mill test.
Wi Bond Work Index Ws Specific energy correction for size distribution (kWh/t) WiBM Bond Ball Mill Test Work Index (kWh/t) 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
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 ...
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.
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 ...
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 ...
Table 3 Bond ball mill work index database table for example samples Id Name WiBM µclosing WiBM f80 WiBM p80 WiBM gpr WiBMSynthetic Laboratory Comment 1529Lik composite 7 ALS Kamloops Zazu metals NI43101 March 3, 2014 1600Gamsberg Pyrite 106 van Drunick Gerold Palm, IMPC2010
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
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