The grindability of an ore in the process of mineral dressing can be determined by use of the Bond work index (Wi). This index is determined on a laboratoryscale using a Bond ballmill and by ...
WhatsApp: +86 18838072829The 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 ...
WhatsApp: +86 18838072829The reason for this variation in ball mill work index is because the ore at Mt. Milligan has an intrinsic exponent of in the 100 µm to 200 µm size range, not the exponent empirically measured by F. Bond. The work index increase between 100 µm and 76 µm is due to a porphyritic grain size that causes a spike in energy
WhatsApp: +86 18838072829Download scientific diagram | Ball mill properties and grinding conditions. from publication: Correlations of Bond and Breakage Parameters of Some Ores with the Corresponding Point Load Index ...
WhatsApp: +86 18838072829For the ball mill grindability test, the work index is calculated from the following revised equation (in short tons): where: Pi = sieve size tested (microns) Gpb = ball mill grind ability Wi, P F have the same meanings as in the top equation. Equipment required: Laboratory ball mill, cm x cm with following ball charge: Agitator ...
WhatsApp: +86 18838072829This Table of Ball Mill Bond Work Index of Minerals is a summary as tested on 'around the world sample'. You can find the SG of each mineral samples on the other table. Source 1. Source 2. Source 3. Source 3. Source 4.
WhatsApp: +86 18838072829Deniz (2004) [22], presented the relationship between Bond's grindability and breakage parameters of grinding kinetic. He conducted grindability test on 6 limestone samples taken from different regions of Turkey and found the following relation between breakage parameter (S i, a T, β and γ) with correlation coefficients of,, and respectively.
WhatsApp: +86 18838072829For P80s finer than 75 μm, the Levin test, a modified Bond ball mill work index test, may be used to predict grinding performance. Signature Plots. No general work index formula governing energy use over a range of conditions, like the Bond equation for intermediate grinding, has yet been found for the fine grinding regime.
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WhatsApp: +86 18838072829The Bond work index of limestone and andesite mixtures. D. Todorović, Z. Bartulović, +1 author. Branislav Ivošević. Published 2017. Materials Science. Mining and Metallurgy Engineering Bor. This paper investigates grinding of mineral mixtures with different grindabilities in the Bond ball mill. Understanding the ore mixture grinding is of ...
WhatsApp: +86 18838072829A Bond Ball Mill Work Index may also be used in the simulation and optimisation of existing mill(s) and the associated grinding circuit(s). Sample requirements: A minimum of 8 kg of material crushed to nominally minus 10 mm is preferred. JKTech would stage crush the sample to minus mm, as required for the Bond Ball Mill Work Index test feed.
WhatsApp: +86 18838072829The Bond work index and the grindability index can therefore be estimated from the friability value, which can be determined more rapidly than from the Bond test. ... The Bond grindability test has been widely used for predictions of ball and rod mill energy requirements and for selection of ... The high work index of limestone could be due to ...
WhatsApp: +86 18838072829The ball mill work index laboratory test is conducted by grinding an ore sample prepared to 100% passing mm to product size in the range of 45150 µm, thus determining the ball mill w i .
WhatsApp: +86 18838072829In this regard calculation of work index of limestone made by standard Bond grindability test. Ball mill was employed to conduct the grinding test of seven different samples. Among all seven samples collected from the different faces of quarry, Bond work index of limestone Face4A results less than 20kwh/t, remaining 6 samples are marked as hard
WhatsApp: +86 18838072829In the Bond ball mill test, the work index is finally obtained. by. w. ... clinker, limestone, fluorspar and granulated copper slag. Ore sample preparation. To perform the Bond test, samples.
WhatsApp: +86 18838072829It was shown that the net grinding power in the Bond ball mill under standard conditions is 144,5 W, the MSL14K mill under specified conditions is 81,5 W. Four types of ores of different mineral ...
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WhatsApp: +86 18838072829An SMC Test® and Bond ball mill work index test ... Airdried limestone was crushed continuously in a laboratory singletoggle Blake jaw crusher designed to provide a throw of 228 mm. The lower opening close set was 102 mm and the maximum bottom opening was 330 mm. The gape was 813 mm and the width of hopper 1067 mm. 90% of the ore commenced ...
WhatsApp: +86 18838072829THE BOND WORK INDEX OF LIMESTONE AND ANDESITE MIXTURES** Abstract This paper investigates grinding of mineral mixtures with different grindabilities in the Bond ball ... value is found in a laboratory Bond ball mill by simulating dry grinding in a closed circuit until the 250% circulating load has been achieved (Magdalinovic, 2003).
WhatsApp: +86 18838072829It provides the Bond Ball Mill Work Index which expresses the resistance of material to ball milling. ... several samples of limestone were collected from four locations in Quena and Sohag ...
WhatsApp: +86 18838072829See 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.
WhatsApp: +86 18838072829Bond Ball Work Index for Some cement raw materials is as under. (FC Bond Paper) Limestone , Shale ,Bauxite , Gypsum, Silica Sand , Iron Ore , Sand stone ...
WhatsApp: +86 18838072829A standard Bond mill (Fig. 1) was designed to perform the work index tests and determine the energy consumption of various s mill has a round internal housing at the corners, has no lifters, and is for dry grinding. The inner diameter and the length are m, and the ball load is % of mill volume (equaling a total weight of kg).
WhatsApp: +86 18838072829The Bond ball mill work index is an expression of the material's resistance to ground and a measure of the grinding efficiency. The test is a standardized methodology that ends when a circulating load of 250% is obtained.
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