where, Operating profit = Net sales – COGS – Opex. It is to be noted that several factors can impact this expense, which includes (not exhaustive) pricing strategy, raw materials price, labor cost, etc.However, these expenses are part of daily decisions, and such financial performance based on OPEX can be regarded as a measure of …
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Moreover, the operating work index frequently gets confused for a specific energy (SEC) consumption in documents such as National Instrument (NI) 43-101 reports. Understanding where the work index ...
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Calculate a Mill's Operating Work Index. Previous. Next. Use this online formula to calculate a Ball Mill, Rod Mill or SAG Mill Operating Work Index. Based on Fred Bond's work you can estimate the energy used into your grinding circuit.
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Eliminating variations in mill circuit feed and product, Table IIIB shows the comparison based upon the work index calculated from the operating data (Wio). The next comparison eliminates the variations …
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Now, let's work through a complete example using the preferred OEE calculation. Here is the data recorded for the first shift: Item Data; Shift Length: 8 hours (480 minutes) ... The next step is to calculate the amount of time that production was actually running (was not stopped). Remember that Stop Time should include both Unplanned Stops ...
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The basic parameters used in ball mill design (power calculations), rod mill or any tumbling mill sizing are; material to be ground, characteristics, Bond Work Index, bulk density, specific density, desired …
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Berry and Bruce (1966) developed a comparative method of determining the hardness of an ore. The method requires the use of a reference ore of known work index. The reference ore is ground for a certain time (T) in a laboratory tumbling mill and an identical weight of the test ore is then ground for the same time.Since the power input to the mill is constant …
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How to Calculate the Cost Performance Index . To calculate the CPI, follow these three steps: Step 1: Determine the earned value (EV)—This involves assigning a value to the completed work. The earned value can be calculated based on the percentage of completion or using other predetermined metrics.
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P is the percentage, V 1 is the first value that the percentage will modify, and V 2 is the result of the percentage operating on V 1. The calculator provided automatically converts the input percentage into a decimal to compute the solution. However, if solving for the percentage, the value returned will be the actual percentage, not its ...
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Understanding where the work index fits into the family of power-based grinding metrics will help operators correctly apply the work index and avoid making mistakes.
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Question: 2. A SAG mill operates with a 10,000 hp motor. Typical power draw is 80% of maximum. The 80 percent passing feed size to the mill is 6 inches and the mill discharge has an 80 percent passing size of 2.3 mm. Calculate the Operating Work Index for this mill if the feed tonnage rate is 1175 tonnes per hour.
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#6. Calculate Cpk. The process capability index must account for the spread and centering deviations. Process capability index formula Cpk = min [(Upper limit – Mean) / 3σ, (Mean – Lower Limit) / 3σ ] #7. Interpreting the Capability Index. With results in hand, you must compare the value of Cp and Cpk to determine process capability.
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Learn what Bond's work index is and how it relates to mineral grindability, specific energy consumption and power models. Find out the differences between laboratory, operating …
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First, calculate the actual Operating Work Index, Wlo-ACT, of the grinding circuit. Estimate the 80% passing sizes of circuit feed and product, F80 and P80, in microns .
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The basic work index equation is: W = 10 Wi/√P – 10 Wi/√F(1) where W is the work input required in kilowatt hours per short ton to grind from 80% passing F microns to 80% passing P microns, and Wi is the work index, or the grinding resistance parameter. It represents the energy input required in kilowatt hours to reduce a s…
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The work index is used to calculate the energy requirement to grind rocks in the fine size range, below 2.5 mm into the range of a few hundreds of micrometres. Heterogeneous ore types typically are sensitive to the product size of the test, and the work index value changes if the test is performed to a coarser or finer product.
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The work index Wi was defined by F. Bond as the specific energy (kWh/ton) required to reduce a particulate material from infinite grain size to 100 microns. ... A Rittinger operating index was ...
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W as calculated using the Bond Equation can be converted to kwh per metric tonne by multiplying it by 1.102. If the measured power for the operating data used in the operating work index equation is given as kwh per metric tonne then the calculated operating work index is power per metric tonne.
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To calculate the operating work index the work input is obtained from the mill power which, if obtained from the motor power, has to be the power at the mill pinion shaft. That is, if adjustments were coupled directly to the pinion shaft, then motor output power is the mill pinion shaft power. Work input is then obtained from the mill power (kW ...
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The Bond work index (BWI) is a well-known method used when selecting comminution equipment, to evaluate the grinding efficiency and to calculate the required grinding power. Although considered an industry standard, Bond did not fully define that procedure, and therefore significant discrepancies in test results can sometimes be …
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The company income statement can be used to calculate operating income. It is important to understand which expenses are included and which items are excluded. Below you'll find the operating income formula: How to Calculate Operating Income. You will use the company income statement to calculate operating income. It …
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Use this online formula to calculate a Ball Mill, Rod Mill or SAG Mill Operating Work Index. Based on Fred Bond's work you can estimate the energy used into your grinding circuit. This is the most accurate and informative method, but much of the data necessary for its application is not yet available.
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The operating costs are COGS plus the operating expenses. Operating expenses include all of the above except the interest and tax expenses. So, for the manufacturer, the operating costs are $190,000, which is COGS of $75,000 plus the total operating expense of $115,000.
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The test determines the Bond Impact Work Index which is used with Bond's Third Theory of Comminution to calculate net power requirements when sizing crushers*. It is also used to determine the required open-side settings (jaw crushers and gyratory crushers) or closed-side settings (cone crushers) for a given product size.P80 = 25400 x …
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The coatings were tested in accordance with the standards for this type of refractory A c c e p t e d M a n u s c r i p t materials, 18,19 and with respect to our previous works in this field, 11 ...
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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 …
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Learn how to calculate EBIT, a key measure of operating profitability, with examples and a free online calculator from Wall Street Prep.
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Question: A grinding circuit is processing 810 t/h (of dry feed), using 38kWh/t to reduce the circuit feed of 80 % passing 2,400um, to the circuit product of 80 % passing 160um.a) How much energy is the mill drawing at the pinion?b) How much will the work index change when the required circuit product of 80 % passing is 90um?
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Comminution efficiency can be expressed in three different ways. Theoretical Efficiency: actual energy consumed, in a comminution machine compared to the theoretical energy required to make the size reduction. Operating Efficiency: compares the operating work index, calculated from production comminution machinery operating …
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The Body Mass Index (BMI) Calculator can be used to calculate BMI value and corresponding weight status while taking age into consideration. Use the "Metric Units" tab for the International System of Units or the "Other Units" tab to convert units into either US or metric units. Note that the calculator also computes the Ponderal Index in ...
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What is Operating Cash Flow (OCF)? Operating Cash Flow (OCF) represents the cash generated from a company's regular business operations, indicating whether a company can maintain and grow its operations.This pivotal metric gauges the cash generated or consumed by a company's day-to-day operations during a specific period.It differs from …
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Using the Bond work index to measure operating comminution efficiency Published: 01 November 1998 Volume 15, pages 32–36, ( 1998 )
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In each of the 15 ores the data from the grindability test at 48 mesh alone were used to calculate the Wi values at 28, 35, 65, and 100 mesh, and these were compared with the actual values obtained by testing. ... Comparison with the plant operating work index at product size P may show that the coefficients .018 and .014 in …
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This online time clock uses a standard 12-hour work clock with am and pm or a 24-hour clock for military time. Calculate total work hours with lunch and breaks. See total work hours in hours and minutes …
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Step 3: Calculate the total operating expenses incurred by the company during the year. Also, determine the total depreciation and amortization expense of the period. Step 4: Finally, Operating profit will be calculated by deducting values in steps 2 and 3 from step 1 values. The equation for operating profit is expressed, as shown below.
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