Case
energy calculation in crushing and grinding
2023-08-18T08:08:34+00:00
Quantifying the energy efficiency of fine grinding
Two of the most popular methods for estimating grinding energy requirements are the Bond operating work index (OWi) and the Morrell specific comminution energy method Both relate the comminution energy to the reduction in the 80 th percent passing size of the feed and product streams (F 80 and P 80)Title: Bond FC, 1961 Crushing and Grinding Calculationspdf Author: can Created Date: 4/2/2009 4:00:03 PMBond FC, 1961 Crushing and Grinding CalculationsA general awakening of interest among mill men concerning the mechanical efficiencies of their crushing machines is evident from a perusal of the recent files of mining publications Considering the large part of the power bill which must be debited to the crushing department, such interest is natural When, however, the articles on the subject are read, the only statement upon which the Crushing Energy Work of Crushing Machines
The Effects of Blasting on Crushing and Grinding
Energy Consumption in Crushing and Grinding The energy input to size ore fragments is large Overall reduction, performed in a series of stages may be from an eighty percent feed size passing of 40 cm (158 inches) to a final product size of 270 to 325 mesh (053 to 045 mm) A lot of energy is expended to accomplish this, and it is not a particularly efficient, with much of the energy input the specific energy of the crushing section, the HPGR section and the tumbling mill section separately Hence, for example, in the case of an SABC circuit the total specific energy of the entire comminution circuit will be predicted plus the individual specific energies of the primary crusher, pebble crusher and combined SAG/Ball mill stages The model was originally developed using 3 data SPECIFIC COMMINUTION ENERGY SMC Testing1/1/2016 The specific grinding energy of a particular mineral is written as (35) E G = 10 W i 1 P 80 − 1 F 80 kWh / t Note: 1 kWh/t × 3600 = J/t 2 While 80% passing a particular sieve is accepted as standard for determining the work index, as recommended by Bond, some use 75% instead In Bond’s equation (Equation ), the grinding energy, E G, required for size reduction of rocks in industrial Size Reduction and Energy Requirement ScienceDirect
Grinding Parameters and their Effects on the Quality of
The crushing caused a decrease of specific grinding energy in both cultivars The total specific grinding energy of crushed kernels (the sum of crushing energy and grinding energy) ranged from 476 to 1005 kJkg−1and from 446 to 853 kJkg−1 for hard and soft wheat, respectivelycrushing and grinding; and F80 and P80 are the 80% passing size of the feed and the product ( m), respectively Bond developed a standard laboratory test for the determination of the work index for ball and rod mills in 1952 and modified it in 1961 The standard Bond ball mill grindability test is a closed circuit dry grinding test with a 250% circulating load The standard procedural outline Relationships between comminution J energy and product the ball mill is less energy efficient than a crusher and has to input more energy to do the same amount of size reduction) Hence from equation 7, to crush to the ball mill circuit feed size (x 2) in open circuit requires specific energy equivalent to: f x f x 2 1 W c ic 119* 4 2 M x x 1 (10) For closed circuit crushing the specific USING THE SMC TEST® TO PREDICT COMMINUTION CIRCUIT
GMSG GUIDELINE: DETERMINING THE BOND EFFICIENCY OF
First, calculate the actual Operating Work Index, WloACT, of the grinding circuit • Estimate the 80% passing sizes of circuit feed and product, F80 and P80, in microns • Calculate W, the specific work or energy input, from the size reduction equipment power (kW) and circuit tonnage (t/h) (Auxiliary equipment power is excluded)The reduction ratios for each successive crushing and grinding process influence the distribution of particle sizes and the energy use in the process Energy use is relatively low when particle sizes are consistent Finer particles resist breaking and are displaced, causing energy to dissipate Larger particles reduce grinding efficiencyMining energygovauthe specific energy of the crushing section, the HPGR section and the tumbling mill section separately Hence, for example, in the case of an SABC circuit the total specific energy of the entire comminution circuit will be predicted plus the individual specific energies of the primary crusher, pebble crusher and combined SAG/Ball mill stages The model was originally developed using 3 data SPECIFIC COMMINUTION ENERGY SMC Testing
(PDF) Predicting the overall specific energy requirement
According to the characteristics of ore, the total energy requirements of three common crushing machines were calculated in [14], which showed that the specific energy of SAG mill grinding is 1/1/2016 The specific grinding energy of a particular mineral is written as (35) E G = 10 W i 1 P 80 − 1 F 80 kWh / t Note: 1 kWh/t × 3600 = J/t 2 While 80% passing a particular sieve is accepted as standard for determining the work index, as recommended by Bond, some use 75% instead In Bond’s equation (Equation ), the grinding energy, E G, required for size reduction of rocks in industrial Size Reduction and Energy Requirement ScienceDirectThe crushing caused a decrease of specific grinding energy in both cultivars The total specific grinding energy of crushed kernels (the sum of crushing energy and grinding energy) ranged from 476 to 1005 kJkg−1and from 446 to 853 kJkg−1 for hard and soft wheat, respectivelyGrinding Parameters and their Effects on the Quality of
11 Crushing and classification
11 Crushing and classification Estimates vary, but it is generally accepted that of all the energy used in the World something like between 1 and 10% is in comminution, ie the processes of crushing, grinding, milling, micronising, etc Changing the size of the particles by crushing creates many important industrial products An example is The effects of blasting on crushing, grinding efficiency and energy consumption are discussed The size of fragments is important in crushing as it effects production and downtime In the process (PDF) The Effects of Blasting on Crushing and Grinding Table 1: Energy and cost calculations by unit operation Operation Feed size Product size Work input Energy cost cm cm kwh/ton $/ton Explosives ∞ 40 24 087 Primary crushing 40 102 23 016 Secondary crushing 102 191 61 043 Grinding 191 0053 1935 135 Totals 2043 150 By far the greatest work input is in grinding Size is reduced by a factor of 360 In primary crushing, it is [PDF] The Effects of Blasting on Crushing and Grinding
Power Consumption Calculator For Crushers
pipe crushing power calculator Power consumption calculation is one of the biggest manufacturers in Aggregate Processing Machinery for the pipe crushing power calculator, sand Read more cement consumption calculation spreadsheet,Cement mining per capita energy consumption in Get details of cement consumption calculatorWe collected most affordable price aggregate Comparison between bond crushing energy and fracture processing zone of a crusher, a cubic and a spherical specimen of limestone were prepared, and their fracture process in a laboratory jaw crusher were studied using a highspeed camera PFC3D model of rock and jaw crusher In order to examine the fracture behaviour of the rocks and to determine the applied energy in a jaw crusher, a PFC3D Limestone crusher energy formulaHenan Mining Machinery Co drastically reduced The particle calculation with reference to the behaviour of quartz particle when subjected to comminution in 10 fold steps is indicated in table 1 Assuming that in the actual operation also a similar situation occurs if not exactly as in the particle calculations the operation of crushing and grinding can be ex Energy requirements in size reduction of solids
F C Bond, “Crushing and Grinding Calculations,” British
The calculation is based on the sizeenergy relationship e1,2=C (1/x2n–1/x1n), which for n = 05, x1 = ∞ and x2 =100, by definition gives e∞, 100 = Wi and consequently C=10Wi21/6/2019 According to the Coalition for EcoEfficient Comminution, comminution – the process of crushing and grinding ore – is by far the most energy consuming step in the mining processGrinding down energy consumption in comminution Kick’s equation is applicable for crushing, Rittinger’s equation may be used for finer grinding, and Bond’s equation is applicable in the conventional milling range Hukki postulated that the exponent nin the Equation is not constant; it is dependent on the characteristic dimension of the particleRelationships between comminution J energy and product
A Method of C alculating Autogenous/ SemiAutogenous
griding/semiautogenous grinding (AG/SAG), mill speci c energy is now calculated by various fi empirical formulae and pilot testing carried out in small laboratory mills Barratt (1989) described a method using Bond Indices than adding a single factor of 125 to arrive at the AG/SAG specifi c energy In 1991 the Canadians developed the SAGPower Index (SPI), test using 2 kg of material in a crushing energy and work done by the jaw crusher for rocks It appears that the Bond approach is not a suitable method for predicting single particle fracture energy done by the crusher To verify the results obtained from DEM models, the fracture behaviour of the crushed rocks was examined and was compared to the PFC3D results The tensile mode of fracturing is favourably modelled by the Comparison between bond crushing energy and fracture Table 1: Energy and cost calculations by unit operation Operation Feed size Product size Work input Energy cost cm cm kwh/ton $/ton Explosives ∞ 40 24 087 Primary crushing 40 102 23 016 Secondary crushing 102 191 61 043 Grinding 191 0053 1935 135 Totals 2043 150 By far the greatest work input is in grinding Size is reduced by a factor of 360 In primary crushing, it is [PDF] The Effects of Blasting on Crushing and Grinding
calculation of impact crusher capacity and power Mining
Single Rotor Hammer or Impact Crusher Calculations MCV1B202Crushing3BIU Calculation of power for product grading, capacity and power draw impact crusher capacity calculation Home>Solutions > impact crusher capacity calculationBond Work Index In the 1930s through early 1950s, Bond developed a new theory of comminution that introduced an index, called the 'Bond Work Index', which relates power consumption in crushing and grinding to the feed and product size distribution His theory and index were introduced in a widely cited 1952 journal articleFred Chester Bond Wikipediahammer mill crusher calculation jaw crushing efficiency calculation equation grinding plant By differentiating the position we get the equation to calculate the horizontal for particle mechanics like Jaw Crusher, Ball Mill, Hammer Mill, Sigma Mixturecalculate crushing efficiency of crushers