Nov 01, 1998 Rowland, C.A., 1978, “Determination and use of operating work indices in controlled grinding circuits–A proposed concept,” Mill Operator’s Conference and Exhibit, Northwestern Branch, Australasian Institution of Mining and Metallurgy, Mt. Isa, Queensland Australia, June. Google Scholar
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The Bond work index is not solely a material constant but is influenced by the grinding conditions. For example, the finer the grind size desired, the higher is the kWh/t required to grind to that size. Magdalinovic [38] measured the Bond work index of three ore types using different test screen sizes. He produced a correlation between the mass of test screen undersize per …
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Feb 25, 2015 Bond Work Index 𝑤 = 10𝑊𝑖 1 𝑝 − 1 𝑓 W = Power required in KWH to crush 1 short tonne ( 2000 pound) of material Wi is the work index of the material p is the 80 % passing size of the product f is the 80 % passing size of the feed 2/25/2015 6:58:05 AM 23 24.
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2020-9-24 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 (m), and F80 is the 80% passing size of circuit feed (m). 2. Calculate the Standard Circuit Bond Work Index (WiSTD) for the material being processed (equation 3). Wtotal. Contact
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The paper by Angove Dunne (1997) reports a standard deviation in crushing work index tests across laboratories as 4.5. The laboratory CWi value of 27.4 (metric) is almost within 4.5 units of the 22.4 value I calculated, so what you are observing is probably the natural variation in …
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Mar 20, 2017 Safe two-hand operating buttons; The Bond Crushing Work Index (CWI) describes the competency of the ore at larger particle sizes. It is used for the calculation of the actual crusher power requirements. Pendulum mounted hammers with scale.-Test: At least 10 specimens preferably 20 specimens to be tested.
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Jul 08, 2016 How to Find Work Index From Impact Crushing Tests Where C represents the impact crushing strength (1) in foot-pounds per inch of thickness and S is the specific gravity, the Work Index is found by Equation 3. Equation 3: Wi = 2.59 C/S How to Find Impact Crushing Strength From the Work Index
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Jun 23, 2015 Wi = Work Index F80 = 80 percent passing size of the feed (micrometers) P80 = 80 percent passing size of the product (micrometers) The Work Index for rod and ball mills can be determined from laboratory tests and, as demonstrated by Rowland, the relationship gives us a reasonably accurate tool for the design of rotary grinding mill circuits.
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work index, capacity and the reduction ratio. Adopting Gupta and Yan [5] the power is given by, P = Q.R d.w i where Q = crushing capacity, Rd = reduction ratio (x 1 /x 2) and wi = work index. In this work Q = .356 t/hr and x 1 = 7.5mm. A roll gap of 5mm had already been specified and x 2 is less than or equal to this value.
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Oct 24, 2018 To calculate the operating work index of a circuit, you must measure four things: P: The power draw of the mill. This is usually calculated from the input leads to …
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The Bond work index is a measure of ore resistance to crushing and grinding and is determined using the Bond grindability test. Its value constitutes ore characteristic and is used for industrial ...
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The Bond Low-Energy Impact test can be used to determine the Crusher Work index (CWi), also known as the Impact Work Index. The test determines the impact energy at which a specimen fails and allows approximation of net power requirements for sizing crushers. The open and closed sized settings for given product sizes can also be determined.
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= Coarse ore work index and is provided directly by SMC Test For fine particle grinding equation 1 is written as: f x f x 3. 2 b ib. 4 3 W M x x. 2 (5) where . x. 2 = 750 microns . x 3 = P 80 of final grind in microns . M. ib = Provided by data from the standard Bond ball work index test using the following equation (Morrell, 2006): ( ) M 80 ( ) 80 0.295 1 80. 80 18. 18
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1. Prepare 2 kg feed material to be crushed (8 mm to 6.3 mm size). 2. Note the mill radius, ‘R’ and radius of the balls ‘r’. 3. Calculate the critical speed of the mill n c using equation -1. 4. Set the operating speed at 0.6 to 0.8 of n c . 5.
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Basic Comminution Concepts and Recent Trends in the Industry . Crushing reduces the particle size of run of mine ore to such a level that grinding Bond 1952 developed an equation which is based on the theory that the work input is The work index is …
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2020-9-24 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 (m), and F80 is the 80% passing size of circuit feed (m). 2. Calculate the Standard Circuit Bond Work Index (WiSTD) for the material being processed (equation 3). Wtotal. Contact
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Process model of a cyclically operating crusher with N consecutive crushing events. The utilized compression ratio (s/b) u is determined from the location of …
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Mic Ore work index in crusher circuits (kWh/t) Mih Ore work index in HPGR circuits (kWh/t) P100 100% passing size or closing screen aperture (m) P80 80% passing size of the circuit product (m) SABC Semi-Autogenous-Ball-Milling-Crushing SAG Semi-Autogenous Grinding x1–x3 Generic terms for P80 W Specific energy (work) input (kWh/t)
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The operating Work index Wio p can be calculated from crushing in commercial plants to compare the crusher efficiency with laboratory test results. The …
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The operating fi work index, though, is in the range of 21 kWh/t to 25 kWh/t showing high ineffi ciency. This raises the point that, in some cases, the Bond EF4 oversize factor calculation is not suf cient to compensate fi for the milling inef ciencies that arise. This can result in fi the mill being undersized. To counter this problem it ...
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3 cycles is now used to calculate the locked cycle HPi, similar to the Bond Work Index value, where: E = 10 * HPi * (√(1/P 80) - √(1/F 80)) Bond is preferred to the Rittinger equation proposed by others (Klymowsky, 1997) since the use of the square root (0.5 exponent) for the product goes some way in accounting for the additional energy ...
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Crushing and Screening Handbook f METSO MINERALS Metso Minerals in brief Whether you need a single crusher, a multi- stage process or a complete plant, we assist you To be successful in today’s quarry and sand and with the right design for the most cost-efective gravel operations, you need a partner to sup- crushing process.
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Feb 22, 2021 As a result, the calculation may result in an estimated cash flow that is drastically higher or lower than the operating profit. Example of calculating operating profit. The following is an example of how to calculate the operating profit of a business: ABC Company wants to determine its operating income for the previous fiscal year.
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crusher design characteristics such as width and depth of the crushing chamber, 2. open and closed side settings, 3. options on feeding method, e.g., intermittent feeding (manual or direct by haulage trucks) and continuous by conveyor belt, 4. operating characteristics such as the length of stroke, the number of strokes per minute, the nip angle.
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