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 lb ball charge, stand and receiving pan.
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Perform Fred C. Bond8217s grindability tests with this standard BWi test ball mill.
Variations in the Third Theory work index when grinding the same material to different product sies are caused by differences in the relationship of the feed exposure ratio to the product exposure ratio. The exposure ratio is a measure of the amount of fines present, and is found from a screen analysis plot on special semi-log paper.
The Erf Erp relationships in the above equations are empirical. It should be possible to derive a theoretical relationship from the equation for the crack length previously published. However, this equation is so complicated that any theoretical relationship would probably be quite involved, and the attempt was not made. Eq, 17 can be used to check the crack length relationship.
Operating plant information or pilot plant tests may show that the ErfErp ratio is different in the plant than in the laboratory grindability tests. In this case the plant ratio should be used with the calculated standard work index to check the plant work index from Eq. 10.
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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 test requires about 8 kg of material. Although it can work on feed as fine as 2.5 mm, it is best to send material to the testing laboratory that is nominally at least 8 mm including the natural fines that are part of the sample. The laboratories have a standard way of reducing the coarse material to the roughly 2.5 mm sie used to feed the test that will not introduce excessive fines.
It is necessary for the engineer to specify the desired product sie of the test so that the laboratory can choose the appropriate closing mesh screen for conducting the test. This product sie is typically the feed sie to flotation or leaching. Example product sies are 200 181m for copper porphyries select a 212 181m screen, 100 181m for gold cyanidation select a 150 181m or 125 181m closing screen or 75 181m for complex sulphides select a 105 181m screen.
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Ball mill work index is used in several SAGMILLING.COM circuit models, including.
F.C. Bond Ball Mill, Bico Supplier BICO INC. 395-50. 20058-110EA 12808.24 USD. 20058-110. F.C. Bond Ball Mill, Bico. Mills. Designed by F.C. Bond for use by cement companies and quality control laboratories throughout the world. Can be used in calculating the grindability of all ore.
The work index is used to calculate the energy requirement to grind rocks in the fine sie range, below 2.5 mm into the range of a few hundreds of micrometres. Heterogeneous ore types typically are sensitive to the product sie of the test, and the work index value changes if the test is performed to a coarser or finer product. Always specify the desired product sie of the test to the laboratory, or conduct a Ball mill work index adjustment procedure to determine the effect of changing the product sie on work index.
This is a SAG or AG mill plus ball mill model that estimates the overall circuit specific energy consumption using the classical Bond work index equation for multi-stage crushing and single-stage ball milling Essbm including Rowland efficiency factors. The circuit Etotal is equal to the Essbm plus an inefficiency factor CF related to the difference in grinding efficiency of the two types of circuits. The SAG mill specific energy consumption ESAG is calculated using the 1979 Barratt equation and the ball mill specific energy consumption Ebm.
This model includes a phantom cyclone effect in the equations due to the ball mill being calculated by difference and not being calculated by the normal Bond equation. The resultant operating work index of the ball mill will vary according to the ratio of the ball mill, rod mill and crushing work index values and is in the range of 80 of the measured ball mill work index value.
Ball Mill Wio, BWio 8.6 Circuit Wio, OWio 14.6 Bond Ball Mill Work Index, BWi, kWht 13.4 Bond Rod Mill Work Index, RWi, kWht 18.1 Table 1. Example of AGSAG Ball Mill Circuit Wio Calculations 1 2 ABstrAct Optimum use of power in grinding, both.
Mill grinding - Wikipedia, the free encyclopedia. Rod mills are less common than ball mills for grinding minerals. The rods used in the mill, usually a high-carbon steel, can vary in.
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30cm x 30cm ball mill used for FC Bond method of grindability testing. Operates at 70 RPM, automatic revolution counter, synchronous motor, smooth operating electric clutch. Includes ball charge. Built using the Fred Bond Theory. All material used is Mild Steel 1018.
bond s work index ball mill lab model manufactuer in india. 1 Introduction 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.
Bond s work index ball mill manufactuer in india bonds work index ball mill offered by insmart systems india private limited a leading supplier of ball mills in hyderabad telangana the company was incorporated in 1993 and is registered with indiamart id 7194698597. Online Chat Bond Work Index An Overview Sciencedirect Topics.
Ball Mill DesignPower Calculation LinkedIn. 12122016 Ball Mill Power Calculation Example. A wet grinding ball mill in closed circuit is to be fed 100 TPH of a material with a work index of 15 and a sie distribution of 80 passing 188 inch 6350.
THE BOND WORK INDEX OF LIMESTONE AND ANDESITE MIXTURES value is found in a laboratory Bond ball mill The Bond work index determination according to the standard Bond s test is done on all these samples with compara-tive sieve sie of 74 105 and 150 microns.
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