·Probability of Crushing Particles in a Jaw Crusher from Equation The models for determining the power required for operating jaw crushers have mostly been derived using Bond s work index While these gave satisfactory estimations of power it must be remembered that Bond s expression was derived using a tumbling mill where the
·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
·They estimated energy using the bond work index and utilized online optimization algorithms to enhance the efficiency of laboratory crushers Johansson at al 2017 proposed a basic model for an industrial scale jaw crusher which predicted capacity and power consumption for various speeds and crusher settings
PDF On Aug 21 2003 James George Donovan published Fracture Toughness Based Models for the Prediction of Power Consumption Product Size and Capacity of Jaw Crushers Find read and cite all
·To achieve a model using physical modelling techniques the machine of interest a jaw crusher in this case has to be broken down into smaller subsystems and modelled separately for example breakage dynamics or pressure as seen in Fig this research the modelling approach is similar to the approach used by Evertsson 2000
In this study the effects of three different choke feed level 1/1 1/2 and 1/4 and four different effective reduction ratios 5 10 and 20 depend on the capacity of the crusher of the
intention of decreasing the Bond work index Wi will produce large energy savings Workman and Eloranta 2003 In the previous research the specific crushing energy was determined indirectly based on the pendulum or falling weight tests None of these ways of testing simulates the motion of the jaw crusher s jaw
The work index is a measure of the ore hardness and the mechanical efficiency Since granite will be used at the validation stage of this project; Vol 36 No 3 July 2017 818 DESIGN AND OPERATIONS CHALLENGES OF A SINGLE TOGGLE JAW CRUSHER A REVIEW it is pertinent to note that the Bond work index for granite is /ton [30]
·This equation reverts to the Bond equation Equation by taking the value of B as 12 and integrating; thus E = k 1 P 6 12 − 1 F 6 12 which in effect is the Bond equation Bond s original work on establishing the energy for size reduction was established in a m 8 foot internal diameter wet grinding overflow type ball mill
The Bond 1952 equation is used to scale the energy consumption in crushing But the energy required to crush a ton of material differs from machine to machine As an alternative Bond s work index can be related to the values that represent energy consumption in industrial crushers by some scaling factor
·Values of the Bond work index for common ores and minerals and 10% retained on 1 mm screen The crusher requires kWh to carry out this operation Determine the power required to crush 8 mm limestone cubes to mm size with the same crusher being fed at the same rate using A the von Rittinger equation and B the Kick
·With a lab scale jaw crusher as a test case an optimisation was made on how to operate it most energy efficiently by using an evolutionary algorithm numerical method This approach implies the measurement of variations in the Bond Work index values during the pre treatment of the material to be crushed The most accepted
·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
·Table 1 shows a comparison of the specific energy values calculated from Eqs and for the 100 mesh test sieve S = 150 µm and seven values of G in the range of 3 g/ can be seen that at a G value of both the equations give the same estimate of the specific energy For G values greater than the Bond equation gives
·The traditional Bond work index proposed by Bond over 60 years ago is still today a useful tool for characterizing material crushability and grindability in the minerals industry
·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
The work index is a measure of the ore hardness and the mechanical efficiency Since granite will be used at the validation stage of this project; Vol 36 No 3 July 2017 818 DESIGN AND OPERATIONS CHALLENGES OF A SINGLE TOGGLE JAW CRUSHER A REVIEW it is pertinent to note that the Bond work index for granite is /ton [30]
·The particle size range of the biomass particles prior to densification was obtained using the British standard BS EN 16126 2012 [39] 2 litres of boiling deionised water was poured over 300 ± 1 g of each pellet sample and then soaked for 24 h The samples were then dried at 35 60 °C until they reached 5 15% moisture samples
·Table Bond s work index for some materials Material Work index Bauxite Cement clinker Clay Coal Granite Gravel Limestone The Bond s equation is 1 1 36 2 1 b b a Jaw crusher b Impact crushers c Gyratory crushers d Crushing rolls
·To determine the Bond s work index the samples were prepared by crushing large lumps of basalt slate and granite in a dodge type jaw crusher A gape of mm was set in primary stage and mm in the secondary stage so as to avoid the extra fine particles 2 3 pieces of sample lumps close to cubical shape weighing cumulatively
·The Bond Crushing Work Index is common to calculate the power needed to crush rocks from a given F80 size to a resulted 3″ and 2″ square rock pieces The resulting consumed power is calculated using Bond s standard equation See how BWi relates The throw of the crusher is the distance that moving jaw moves in going from
·trial jaw crushers was analyzed using the proposed equation in combination with that of Bond 1961 for calculating the energy requirement in size reduction The equation for capacity The volumeof material V that passes through the crusher bottom opening per stroke is given by If the machine is run at low speeds the movement of the
·WORK INDEX Work Index Wi is defined as the gross energy requirement in kilowatt hours per ton of feed needed to reduce a very large feed to such a size that 80% of the product passes a 100 m screen This relation leads to a relation between Kb and Wi If Dp is in milimeters P in kilowatts and m in tons per hour Kb √100 10 3 Wi= Wi
·In their study energy was estimated with the Bond work index and an on line optimization algorithm was used to increase the efficiency of a laboratory crusher A similar study was conducted by Tosun and Konak 2015 with a broader perspective including blasting primary crushing and secondary crushing as an energy assessment
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