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The Bond ball mill work index test is a standard procedure to determine the ore grindability in function of specific energy (kWh/ton). ... Impure minerals, Limestone (98% CaCO 3), fluorite (75% CaF 2), copper ore (2.5% Cu), and hematite (19% Fe) ores were used to run the tests. Initially, the sample (20 kg) is crushed to , passing at …
The grindability of an ore in the process of mineral dressing can be determined by use of the Bond work index (W i). This index is determined on a laboratory-scale using a Bond ball-mill and by simulating dry grinding in a closed circuit until the 250% circulating load has been obtained. ... A= Wi(B) - Wi(A) Bond test, Abbreviated test, Wi …
The Bond ball mill grindability test is one of the most common metrics used in the mining industry for ore hardness measurements. The test is an important part of the Bond work …
Indian Journal of Chemical Technology Vol. 17, November 2010, pp. 455-461 Comminution behaviour of microwave heated two sulphide copper ores Erol Kaya Dokuz Eylul University, Department of Mining Engineering, Buca, Izmir, Turkey Email: [email protected] Received 16 March 2010; revised 5 August 2010 The effect of microwave irradiation on …
After milling for 15 min, a representative sample of 150 g from each test was subjected to sieving by vibrating sieve shaker. Mular and Bhappu (1980) and Noaparast et al. (2012) showed that the ...
Bond work index grindability values decreased for the vein type copper ore (ore 2) in which fusing of particles was not observed. The largest decrease, i.e. improvement, in the work index (by 13% ...
1. Introduction. The Bond grindability test for determining the Bond work index, W i, is conducted in a Bond ball mill having the dimensions D × L = 305 × 305 mm and a speed revolution of 70 min − 1.The mill is loaded with balls from 15.5 up to 30.6 mm in diameter, having thus a total mass of 20.125 kg.. This test simulates a closed circuit …
The effect of mineralogy on the grindability was investigated using three copper ores – two sulphides and one oxide. The dominant copper minerals were identified by optical microscopy and
x Suitability of the ore for heavy liquid testing is assessed by the requirement that combined CO B2 B + Fe + S is < 50% and SiO B2 B is > 30%. Laboratory heavy liquid testing will be recommended for samples < 4kg. Larger bulk samples with a topsize up to 40mm may be tested with an Erickson cone.
Samples of dacite and basalt from Serbia, copper ore from a South American meta-sedimentary copper mine, and copper porphyry ore from Canada, of different …
Tests are conducted at the mesh size to which the ore is to be ground in practice, and the cava.citv - to be expected from a given mill is calculated by the grindability with that of a similar standard ore whose verformance characteristics arc known.
The ball mill grindability test is used for describing ore hardness and it is so widespread that the Bond Work Index generated from the test is often referred to as an ore characteristic.
1.. IntroductionA 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 relative grindability is the ratio of the ore to be tested to the standard ore with known grindability under the same test method and test conditions, with limestone usually used as the standard medium hard ore. Absolute grindability is the grindability value of the ore measured under the specified test method and test …
Starting from the first-order grinding kinetics defined by means of the Bond ball mill, this paper discusses a simplified procedure for a rapid determination of the …
Metal. Mater. Miner., São Paulo, v. 15, n. 2, p. 91-95, abr./jun. 2018 Abrasiveness evaluation of pre-concentration of copper sulfide ore products through LCPC test 2 MATERIALS AND METHOD Copper sulfide ore from Mineração Caraíba S/A's Boa Esperança Project, state of Pará [14], was used in this study.
There is no doubt about the practical interest of Fred Bond's methodology in the field of comminution, not only in tumbling mills design and operation but also in mineral raw materials grindability characterization. Increasing energy efficiency in comminution operations globally is considered a significant challenge involving several Sustainable …
The present work initially studies the impact of a laboratory microwave (MW)'s location (before and after a jaw crusher) on grindability of a copper ore. Additionally, the role of MW's radiation time (15–150 sec) and grinding time (13, 15 and 17 min)
The pilot plant can test coarse feeds (150mm), as well as essentially any test conditions, so it presents the lowest degree of scale-up within all the methodologies available, but pilot …
The second purpose is to estimate ore samples' geomechanical properties and Bond work index, as an indicator of grindability, for an extraction bench in the …
Several grindability tests were developed over the years to design grinding circuits or optimize existing operations. Each test has its own strengths and weaknesses and it is imperative to select the proper test procedure(s) to meet project deliverables and minimize the risk of a project. Pilot plant testing of large bulk samples historically constituted the …
The ball mill grindability test is used for describing ore hardness and it is so widespread that the Bond Work Index generated from the test is often referred to as an ore characteristic. ... 5.57 −2.96 Clinker 200 12.36 12.25 +0.89 Gypsum 200 6.08 5.78 +4.93 Fluorspar 200 6.94 7.41 −6.77 Copper slag 200 18.40 19.10 −3.80 Mean-square ...
The test work program was carried out on those five ore samples obtained from the copper-porphyry orebodies. Total of 38 Bond work index tests, including duplicates, were done. Standard Bond ball mill test procedure were carried out on crushed (-3.35 mm / 6 mesh) material at different
-Yan and Eaton (1994) performed the experiments on two different samples of gold ore, and their mixtures with a large difference in grindability Wi = 14 and Wi = 6, and they found that it is not ...
Here is the old Allis-Chalmers Bond Work Index Grindability Test Procedure. The standard feed is prepared by stage crushing to all passing a 6 mesh sieve, but finer feed can be used when necessary. ... Ore Laboratory Testwork. Comminution Testing; Mineral Liberation; Gravity Concentration Testing; Flotation Testing; …
A Bond Ball Mill, 12" x 12" of fabricated construction comes with electric motor and gear reducer drive, digital counter, jogging button to provide positioning of drum for loading and unloading, emergency stop button, 44 ½ lb ball charge, stand and receiving pan. Perform Fred C. Bond's grindability tests with this standard BWI test ball mill.
Bond Grindability Test Procedure. The Bond Ball Mill Grindability test is designed to give a measure of the grinding characteristics of a material by finding the amount of size reduction …
The grindability test showed that the MW-treated iron ore ground much more rapidly than the unmicrowaved ore. 0.9 kW Breakage function of microwaved and untreated iron ores was dependent Kumar et al. [34] Iron ore (Orissa, India) …
This method uses a mathematical algorithm to simulate the Bond test based on the results obtained from the first two grinding cycles of the standard test to …
The ball mill grindability test is used for describing ore hardness and it is so widespread that the Bond Work Index generated from the test is often referred to as an ore characteristic. The ore resistance to grinding and energy consumption can be expressed using the work index and Bond's Third Theory. ... Copper ore samples from Canada are ...