The traditional Bond work index proposed by F.C. Bond over 60 years ago is still today a useful tool for characterizing material crushability and grindability in the minerals industry.
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A sectional view of the single-toggle type of jaw crusher is shown below. In one respect, the working principle and application of this machine are similar: the movable jaw has its maximum movement at the top of the crushing chamber, and minimum movement at the discharge point. The motion is, however, a more complex one than the …
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It is preferable, therefore, to consider the feed to the grizzly as being equivalent to the feed to the crusher and calculate the Work Index on this basis. How to Correct Calculated Work Indexes for Unnatural Feeds. Several methods (2) have been used to correct the calculated Work Index for large differences between the product and …
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Drive power calculation of a crushing machine working in shear Aleksandr Nikitin1*, Nikita Kurochkin1, and Yonghui Yang2 1Siberian State Industrial University, Novokuznetsk, 654007, Russia 2University of Science and Technology Liaoning, Anshan, 14051, China Abstract. The description of crusher design is given, in which the
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Figure 5.1 Schematic diagram of a crusher showingg the open- and closed-side settings. 5.1 Jaw and Gyratory Crushers. Jaw and gyratory crushers are used mostly for primary crushing. They are characterized by wide gape and narrow discharge and are designed to handle large quantities of material. The capacity of the crusher is determined by its size.
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The traditional Bond work index proposed by F.C. Bond over 60 years ago is still today a useful tool for characterizing material crushability and grindability in the minerals industry. Although not as popular as the Bond ball mill or the Bond rod mill work indices, the impact work index, also called Bond crushability index, continues to be much used for …
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FIGURE 8: ROD MILL/BALL MILL WORK INDEX RATIO v. UNCONFINED COMPRESSIVE STRENGTH 100 200 300 400 UCS (MPa) 0 0.5 1 1.5 2 WiRM/WiBM (metric) Siddall et al (1996) identified the ratio of Bond rod mill Work Index and ball mill Work Index as being indicative of an ore's compentency. Figure 8 plots this ratio versus …
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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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crushers (C200 series) are 1600 x 2514 mm with motors rated at 400 kW. The largest particle that can enter the opening of the jaw crusher can be estimated by: Largest particle size= 0.9 x gape. The largest particle to report to the jaw crusher is typically defined by the drilling pattern in the mine. Typical Jaw Crusher Characteristics
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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.
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Crushers. Barry A. Wills, James A. Finch FRSC, FCIM, P.Eng., in Wills' Mineral Processing Technology (Eighth Edition), 2016 Jaw-crusher Construction. Jaw crushers are heavy-duty machines and hence must be robustly constructed. The main frame is often made from cast iron or steel, connected with tie-bolts. It is commonly made in sections so that it can …
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Three crusher types are used to demonstrate these capabilities: 1. Twin roll crusher. 2. Cone crusher. 3. Vertical Shaft Impactor (VSI) These show the nature and level of fidelity that is now possible to include in particle scale crusher models including breakage of non-spherical particles and prediction of the product size distribution and ...
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Type in inches and feet of your project and calculate the estimated amount of Base Material in cubic yards, cubic feet and Tons, that your need for your project. The Density of Crusher Run : 2,410 lb/yd³ or 1.21 t/yd³ or 0.8 yd³/t
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A discussion thread about how to calculate the crushing work index (CWi) based on Bond equation and compare it with lab tests results. See the data, formulas, corrections, and …
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The paper examines the determination of the bond work index (BWI) on finer samples and proposes an equation for the BWI on finer samples. The BWI is a …
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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 self-grinding work index is an extension of the concept of Bond work index. It generally refers to the work index calculated by using Bond's fracture theory on the principle of ore crushing energy consumption according to the W, F, and P data of a small or semi-industrial or industrial self-grinding test. In this kind of test, McPherson …
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Comminution by gyratory crusher is the first stage in the size reduction operation in mineral processing. In the copper industry, these machines are widely utilized, and their reliability has become a relevant aspect. To optimize the design and to improve the availability of gyratory crushers, it is necessary to calculate their power and torque …
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The F. Bond Pendulum crusher Carring on with a theme that we've already touched in the previous publication, we will consider the methodology of the F. Bond index calculating. As you know, there are three calculation methods. The method selection depends on the crushing/grinding stage (the power size and the necessary finished …
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The following example demonstrates a method of selecting the components of an aggregate plant. Good component efficiency and part performance pre-evaluation is essential to a solid design. The aggregate production requires the consideration of several crushers, feeders and screens. This is not intended to be a typical situation, though it …
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Learn how to calculate the Bond Impact Crushing Work Index, a measure of rock hardness and crusher sizing, using a pendulum hammer test. Find a referential table of work index values for different rock types and compare with other crushing work index …
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The specific energy consumption at the motor input can be predicted using Bond's equation: E = 10 × CWi × (P80 – ½ - F80 –½). where CWi is your work index, F80 is the 80% passing size of the feed measured in µm, and P80 is the 80% passing size of the product measured in µm. E is the specific energy in kWh/tonne. Very important -- there are five …
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50-100tph Hard-stone Crushing Plant There are several ways to calculate the production capacity of a stone crusher, but the following steps are the most commonly used: 1.Determine the desired ...
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Flakiness Index of aggregate is the percentage by weight of aggregate particles whose least dimension is less than 0.6 of their mean dimensions. This test is applicable to aggregates having size larger than 6.3mm. To calculate the flakiness index of the given sample of aggregates, the weight of each fraction of aggregates passing and retaining ...
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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 decimal representation. EX: P × 30 = …
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This is or was used by to acquire the Impact (AKA Crushing) Work Index for sizing crushers. Use this in complement to the Bond Crushing Work Index Procedure. Another Summary Table of various Impact Work Index by Rock or Mineral Type (/metric tonne). Find a referential Rod Mill Work Index Table here.
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capacity of crusher, 2. power consumption if the work index of the material is 12.5 kWh/t, 3. operating speed, 4. minimum level at which the feed should be maintained in the feed-hopper. 4.5. A cement manufacturer needed to produce lime at the rate of 140,000 t/year in a rotary kiln operating 360 days in the year.
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From Allis-Chalmers' Superior Primary and Secondary Crushers. ° Actual required depends on stone hardness, reduction ratio, and so on. If a 60-in. gyratory crusher is to process material from a quarry where a shovel loads the raw material, the shovel would probably have to have a dipper capacity of at least 5 cu yd to be compatible.
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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 hh:mm format as well as decimal hours. How to Calculate Work Hours. Enter numbers such as 1215 for 12:15 or 137 for 1:37. Using a …
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Using the Crush and Run Calculator involves the following steps: Measure the length and width of the project area (in feet or yards). Input the measured dimensions into the calculator. Specify the desired depth of the crush and run layer (in inches or feet). Click on the calculate button to obtain the quantity of crush and run needed. Example:
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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 …
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The kilowatt-hours per tone (kWh/t) will work out your work index. The number of kittowatts consumed in a hour divided by the tonnes of rock gives you your work index. Remember, the higher the Work Index the more work required to crush the rock. This will impact the equipment chosen for your project.
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Calculating the horsepower of a crusher involves several factors, including the material being crushed, the size of the material, the size of the output, and the crusher's design. ... - Work Index ...
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The Bond Crushing Law calculator calculates the energy required for crushing of a solid material based on Bond's Law. It helps in predicting the energy needed to reduce the …
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Work index is a material parameter that indicates the difficulty of ore crushing or grinding in mineral processing. Learn about the different types of work …
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Proper sizing and selection of cone crushers are essential to maximize productivity and efficiency in aggregate and mining operations. Cone crushers are indispensable crushing machines, but their output capacity depends heavily on making the right design choices.Here are some factors to consider: Consider The Type Of Material …
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The present trend is to replace secondary cone crushers by HPGR. The work at Polysius [3] ... [21] indicated that the Bond work index is not exactly a constant factor for a given ore. Otte [5] reported an increase of W i from 13.9 to 15.6 kWh/t for a copper ore and 9.4–15.6 kWh/t for a gold ore.
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Geometallurgical modeling of the production benches is an attempt to estimate the geometallurgical variables of the different ore domains, which leads to a better understanding of the ore and its properties. Having geometallurgical variables results in a more accurate prediction of ore characteristics, an improved drilling and blasting …
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In this Cone Crusher article we want to educate you about what to consider when purchasing a cone crusher. It also will inform and educate you if you are a current owner or operator of a Cone Crusher. If you have a good base of knowledge about cone crushers you can skip through the article by choosing the topics below.We will be …
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