We have an existing plant and I want to calculate the CWi based on Bond formulation and compare it with lab tests results. At the existing plant the data are: F80= 370mm. P80= …Web
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Unformatted text preview: Briefly discuss the results of the operating Work Index/Reduction Ratio. Question 4. Explain why a Tower mill is significantly more energy efficient than a conventional ball mill when grinding ore to a product size of 20 μm.Question 5.Describe how the following variables affect the grinding rate within a ball mill: • Ball loading • Mineral …Web
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work index, and ˜ P 80 and ˜ F 80 are ... one was selected in this work, and the details of the calculation procedure of the breakage. ... the crusher will be operating in choke feed conditions.Web
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Analysis and modeling of cone crusher output. The operational part of the cone crusher is the crushing chamber, which consists of a mantle and a concave liner. As shown in Fig. 1, the axis of the mantle intersects the axis of the crushing chamber at point O, which is the pivot point. The angle between the two axes is γ, which is the eccentric ...Web
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A calculation procedure for the crushing power of crushers is presented, and recommendations for the selection of the minimum resolved particle size are given. ... and crusher operating parameters ...Web
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Preparation of Test Feed Sample for Bond Work Index Procedure: Riffle 8-10 kilograms of minus half an inch feed into 500 gram charges. Riffle one 500 gram charge of ore down to splits of 125 grams each. Record the exact weight of one split; identify it as Feed No. 1. Wet screen through a 150 mesh screen.Web
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UNTIL THE THIRD THEORY OF COMMINUTION of "Work Index" method of determining crushing and grinding mill size was introduced, there was no way of accurately figuring the most applicable, most economical size of crushing and grinding mill. Naturally, with little or no factual operating data correlated in useful form, it was easy enough, …Web
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Thus, a computer program can be developed to calculate operating work indices from on-line data with the feed size a constant and with the program designed to permit manually changing this value, as required to take into account changes in feed size resulting from such things as drawing down feed bins, crusher maintenance, work screen surfaces ...Web
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The method selection depends on the crushing/grinding stage (the power size and the necessary finished class). The crushing work index ( CWi) is an indicator characterizing the energy amount (kW * h / t) …Web
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Crusher Operating Work Index Calculation. Thus, for a crusher in a milling train that is referenced to a feed stream, the FillingRatioM is the reference volumetric flow of solids usually the feed into the first crusher divided . Get Price Predicting Gyracone Crusher Performance Agg-Net. Bond as the Work Index and is now considered to be aWeb
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The energy for crushing, E, is the difference between the energy of the input pendulum and the energy of the rebound pendulum and is computed from the following expression: (3.19) E = E S 1 − ɛ 2 M B M B + M S Units: energy terms ( E ) = kWh/t = 3600 kJ/t. mass = kg. the value of ɛ = 0–0.2.Web
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As you know, there are three calculation methods. The method selection depends on the crushing/grinding stage (the power size and the necessary finished class). The crushing work index ( CWi) is an indicator characterizing the energy amount (kW * h / t) needed to destroy single pieces of material with a relatively large size range (-75 + 50mm ...Web
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P80 = 25400 x Oss x (0.04Wi + 0.40) P80 = 25400 x Css x 7Ecc x (0.02Wi + 0.70) / (7Ecc – 2Css) Where Oss = Open-side setting in inches. Css = Closed-side settings in inches. Ecc = Eccentric throw in inches. P80 = Aperture through which 80% of the …Web
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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.Web
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Calculate the Operating Work Index – Crusher,crusher solution …. Home>Crusher Solution>Vertical roller mill> Calculate …Operating work index has the same definition as "work index" which states that "work index is the power … » Free online chat! How to Use Bond equation to calculate work indices from operating …. To distinguish this from the …Web
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These factors often translate to a higher unit power input (kWh/t) than an SAG circuit milling the same ore. but at a higher power efficiency (often assessed by the operating work index OWi, which if used most objectively, should be corrected by one of a number of techniques for varying amounts of fines between the two milling operations).Web
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Atta et al. (2014), based on the work by Evertsson, 2000, Whiten, 1972, Herbst and Oblad, 1985, proposed a cone crusher model that takes into account several operating characteristics to calculate crusher performance maps and the dynamic response of the crusher. The considered characteristics were classification, selection …Web
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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 …Web
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overcome all resistance forces during the operation of the crusher: N N 1 N 2 DR + =, (1) where N1 – the power required for crushing the material; N2 – power expended on friction in the bearings; η – transmission efficiency. The calculation of power is carried out for a single act of crushing, that is, with theWeb
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Bond Impact Crushing Work Index Procedure and Table of Sizing a crusher can be done reliably calculated thanks to the Impact/Crushing Work Index and the testw. Home; Products; Case; Solution; ... C6X Series Jaw Crusher Double wedge adjusting device, Elastic limit damping device C6X Jaw Crush...Web
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1. Calculate the Actual Operating Bond Work Index of the grinding circuit. • Estimate the F80 and P80. • Calculate the work or specific energy input from the size reduction …Web
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The Bond' Crushing Work Index is common to calculate the power needed to crush rocks from a given F80 size to a resulted P80 product size. Bond's impact method comes from a double mirrored pendulum impact crusher test on <76mm but >51mm (3″ and 2″) square rock pieces.Web
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In turn, the product of a secondary crusher operating in open circuit is screened, with oversize fed to a tertiary crushing circuit, typically operating in closed circuit with screens. ... The efficiency of ball-mill secondary milling circuits is often evaluated by the operating work index, which is back calculated using the Bond work index ...Web
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A gyratory crusher received iron ore from the mines at 1.5 m top size. The work index of the ore was determined as 12.5 kWh/t. The height of the bowl was 9.75 m and it was required to produce 300 t/h of crushed material at 175 rpm. Calculate the required crusher set to satisfy the crusher throughput. 5.12Web
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To calculate the processing capacity of a mill, you will need to know the following information: 1.The width of the mill: This is the distance between the two edges of the mill where the material ...Web
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The present work deals with the impact crusher energy efficiency at San Andres Zeolitic Plant. Varying the operational parameters levels (rotor velocity, hammer row number and crusher capacity ...Web
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comparison with pilotplant data and operating plant data for similar ore types (Barratt, 1989). The approach acknowledges grinding efficiency as the ratio of operating work index to that for a single-stage ball mill. The Barratt approach is the basis of the Millpower 2000 computer-based program (Matthews and Barratt, 1991). E SAG = 1.25.[(10.W iC.SWeb
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How to Measure Grinding Efficiency. The first two Grinding Efficiency Measurement examples are given to show how to calculate Wio and Wioc for single stage ball mills. Figure 1. The first example is a comparison of two parallel mills from a daily operating report. Mill size 5.03m x 6.1m (16.5′ x 20′ with a ID of 16′).Web
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A crusher does not know what type of material is passing through it. The crusher does however "know" the feed and product sizes, the compressibility, the work index, the level of stickiness, and the abrasion level. With all the application variables defined, the correct type and model of crushing circuit equipment can be properly specified.Web
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the crusher and scalp out fi nes. Primary gyratory crushers – ideally suited to all high-capacity primary hard rock crushing applications. Jaw crushers – we have more installed …Web
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The Pendulum Tester / Bond Impact Crushing Work Index Tester. Working principle Crushing by impact. 76 mm maximum feed size. Test repetition: At least 10, preferably 20 test runs. Adjustable crushing angle …Web
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Bond ball mill w ork index test is used to ca lculate the work index rel ated to ... Bond crusher work index 16. 5 kWh/t . Effective ... The AusGrind calculation is one such powerbased model used ...Web
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