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determination of the work index for ball and rod mills in 1952 and modified it in 1961. The standard Bond ball mill grindability test is a closed circuit dry grinding test with a 250% circulating load. The standard procedural outline of the test is stated in (Bond) 1961. The work index for a ball mill, Wi, is then calculated from the following ...
ball mill operation for further size reduction (grinding). 2.3 Procedure for the Determination of Work Index Using Modified Bond's Method The modified Bond's method for determining work index of an ore involves the use of reference ore of known grindability. Experimental procedures were as follows: 1.
The work index expresses the resistance of the material to grinding. It represents the kilowatt hours per tonne required to reduce the material from theoretically infinite feed size to 80 passing 100μm (Wills and Napierpercent -Munn, 2006). Bond devised several methods for predicting ball-mill and rod-mill energy requirements and
elsewhere (Chipakwe et al. 2020b) and mill parameters from the initial work of Mwanga et al. (2017). The procedure was devel-oped for the Bond ball mill work index to carter for smaller amounts of sample (220 g) than conventional procedures. In control tests, no additives were used (referred to as
Geometallurgy - Wikipedia, the free encyclopedia. Bond ball mill work index test; Modified or comparative Bond ball mill index ... of the SAG Power Index to …
The Bond grindability test is performed in a standard Bond ball mill, dimensions DxL=305x305 mm and a speed revolution of 70 min −1. The mill is filled with balls with a diameter of 15.5 to 30.6 mm, and has a total weight of 20.125 kg.
Size analysis of the ball mill feed and discharge for both the ores was carried ... time produced comparative results with choice of Bond's were device. One of these methods was derived by [1]. The determination of work index using modified Bond's method can be compared to method of determining it by Berry and Bruce in 1966.This method ...
Bond Ball Mill Index - JKTech The BBMWI is a measure of the resistance of the material to crushing and grinding. ... per revolution from the last three cycles is taken as the ball mill grindability (Gbp) in g/ ... indicates some typical figures, and a relative measure of what they mean. ... lab, if there are any special requirements, if the ...
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 3.10), a question arises as to whether this practice will alter the ball mill work index (BW i) of the material ...
mill of 40 feet in diameter and 23.5 feet in length (EGL) associated with two ball mills, 26 feet in diameter and 41.5 feet in length (EGL). The installed power of these teams is 22000 kW and 16400 kW respectively, all operated by gearless systems. The circuit has a stage of crushing pebbles composed of two team MP-1000.
Testwork: Bond Ball Mill Work Index. 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 . The test is a 'locked-cycle' test where ground product is removed from test cycles and replaced by fresh feed. The test much achieve a steady-state before completion.
The Bond Ball Mill Work Index is a measure of the resistance of the material to grinding in a, Bond Rod Mill Index Test; Bond Ball Mill Index Test; JK Bond Ball. Live Chat » modified or comparative bond ball mill. an overview of the small-scale tests available to characterize, index series (ball mill, rod mill, and MacPherson autogenous) and ...
Typical values of Bond ball mill work index for soft oxidised ore bodies lie in the range 5-10 kWh/t at a standard product size of 80% passing 75µm.
also includes the conduct of both the RWi and Bond ball mill work index (BWi) tests on the same standard rock sample. The results of the comparative testing of RWi across seven labor-atories around the world are shown in (Table 1). The standard deviation of the …
bond ball mill index - Shanghai Xuanshi Machinery Vibrating screen Belt Conveyor Vibrating Modified or comparative Bond ball mill index Bond rod mill work index and Bond low energy impact crushing work index ; bond f.c. crushing and grinding calculations …
and consumed power to grind one tone of iron ore were determined via standard Bond mill The results showed that the ore is hematitic ore with Goethite and quartz minerals The ore is low grade containing 41.41 Fe2O3 and 50.88 SiO2 The bond work index test obtained high work index 52.60 kw.h/t and consumed power 11.72 kw.h/t to grind one ton
The Bond ball mill work index test is thought to be additive because of its units of energy; nevertheless, experimental blending results show a non-additive behavior. [18] The SPI(R) value is known not to be an additive parameter, however errors introduced by block kriging are not thought to be significant .
The paper presents comparative studies aimed at reducing labor costs of Bond Ball Mill Work Index test (BWi) by using a number of alternative techniques. Methods of Ahmadi and Shahsavari, Berry and Bruse, Gharehgheshlagh, Horst and Bassarear, Kapur, Magdalinovich, a standard Bond test with feed sizing into limited size grades, and a standard ...
Description : Geometallurgy,Wikipedia, the free encyclopedia Bond ball mill work index test; Modified or comparative Bond ball mill index; Bond rod mill work . Read more DJB Consultants Inc. Millpower 2000 - Twin Metal
Gb Bond's standard ball mill grindability, net grams p of ball mill product passing sieve size P 1 produced per mill revolution. The rest of the terms are defined as in Equation (1). The work index obtained following the standard Bond grindability test described above predicts the energy requirement for a 2.44 meter (8ft.) inside liners ...
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 3.10), a question arises as to whether this practice will alter the ball mill work index (BW i) of the material ...
Correction of Bond Ball Mill Work Index Test for Closing The test work program was carried out on those five ore samples obtained from the copperporphyry orebodies Total of 38 Bond work index tests, including duplicates, were done Standard Bond ball mill test procedure were carried out on crushed (335 mm / 6 mesh) material at differentJK Bond Ball Mill Test,JK Bond Ball Mill Test Since its ...
The modified Bond's method of determining the net work index of ore involving the use of reference ore of which grindability is known. The procedure is as follows: 1.100g each of the ore under test and the reference ore were crushed and pulverized in the laboratory ball mill for an hour.
The recommendations are given for selecting the Bond mill revolutions in the first milling cycle for apatite–nepheline, copper– nickel and iron ore for the sieve size 106 μm. An original procedure chart is proposed for choosing the determination method of the Bond Ball …
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.. Below describes in general terms the Bond Work Index Procedure used by a Professional Metallurgical Testing Laboratory.
a modified Bond ball mill procedure (Mod Bond) was developed by MinnovEX Technologies (now SGS) which requires 1.2kg of sample crushed at minus 3.35mm. The 1.2kg charge is milled with the standard Bond ball mill for a set time. A particle size analysis is performed on the feed and ground product, and a modified work index is calculated using a ...
modified or comparative bond ball mill index. Geometallurgy relates to the practice of combining geology or geostatistics with metallurgy, or, Modified or comparative Bond ball mill index; Bond rod mill work index and Bond low energy impact crushing work index.
Bond method for ball mill work index test 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 ...
The Ball Mill Grindability of ores is generally determined by the Bond standard grindability index test method. However, this test and procedure is not applicable to fine materials such as sands; the grindability of fine materials must therefore be determined by a comparative grinding method, for which a reference material of know grindability is required.
Comparative bond ball mill work index comparative bond ball mill work index 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.