work index values for crushing

Work Index Values For Crushing

using the smc test® to predict comminution circuit …,= 1.0 for all crushers operating in closed circuit with a classifying screen. if the crusher is in open circuit, eg pebble crusher in a ag/sag circuit, k. 2. takes the value of 1.19. x. 1 = p. 80. in microns of the circuit feed . x. 2 = p. 80. in microns of the circuit product . m. ic = crushing ore work index and is provided directly by smc test ®.

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Bond Work Index Tables (Wi) | Rock (Geology) | Minerals

Bond Work Index Tables (Wi) | Rock (Geology) | Minerals

bond work index tables (wi) - free download as pdf file (.pdf), text file (.txt) or view presentation slides online. here there are given tables from various sources for the bond work index values of mining materials (ores, industrial minerals and rocks). these work indexes can be used for the determination of tumbling mills (rod, ball mills) power.,bond grinding circuit efficiency,• bond test wi’s (kwh/t): crushing:16.0 rod mill: 14.5 ball mill: 13.8 • bond standard circuit work index: w1 = 16.0 x [(10 / sqrt 16,000) – (10 / sqrt 165,000 )] = 0.9 kwh/t w2 = 14.5 x [(10 / sqrt 1,000) – (10 / sqrt 16,000)] = 3.4 kwh/t w3 = 13.8 x [(10 / sqrt 125) – (10 / sqrt 1,000)] = 8.0 kwh/t

Geometallurgy - Wikipedia

Geometallurgy - Wikipedia

test work. the following tests are commonly used for geometallurgical modeling: bond ball mill work index test; modified or comparative bond ball mill index; bond rod mill work index and bond low energy impact crushing work index ; sagdesign test; smc test; jk drop-weight test; point load index test; sag power index test (spi(r)),metcom expertise - metcom technologies,so the work index of this circuit is the equivalent amount of energy (w) it would use to reduce this ore from a very large size to a p80 of 100 um. for any circuit, whether a crushing circuit, a rod mill, or a closed ball mill circuit, the work index always means the equivalent amount of energy to reduce one ton of the ore from a very large size to 100 um.

Kicks LawIt state that the work required for crushing a

Kicks LawIt State That The Work Required For Crushing A

bond work index (w i, kwh per tonne) mineral work index (w i) mineral work index (w i) barite 4.7 - 6.9 glass 3.4 basalt 17.0 - 22.5 granite 15.1 - 16 cement clinker 14.8 limestone 9.0 - 12.8 coal 12.5 - 13.0 mica 148.0 dolomite 9.0 - 12.4 quartz 13.6 - 14.1 feldspar 12.8 quartzite 9.6 bond work index (w,amit 135: lesson 5 crushing – mining mill operator training,metso 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

2 Types of Concrete Crushers | HXJQ

2 Types Of Concrete Crushers | HXJQ

jaw crusher, also known as concrete crusher, is usually used as the primary equipment for concrete crushing. it is also suitable for metallurgy, mining, construction, chemical, water conservancy and railway sectors, and used as a device for fine and medium crushing of ores and rocks with compressive strength below 250 mpa.,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 testwork research done by fred chester bond and his 1952 paper. according to bond ’s third theory of comminution , the work/energy input is proportional to the new crack tip length created during particle breakage and equivalent to the work represented by the product – the feed.

Bond Work Index - an overview | ScienceDirect Topics

Bond Work Index - An Overview | ScienceDirect Topics

the values of work indices obtained are indications of the efficiencies of the machines. thus, the equipment having the highest indices, and hence the largest energy consumers, are found to be jaw and gyratory crushers and tumbling mills; intermediate consumers are impact crushers and vibration mills, and roll crushers are the smallest consumers.,bond tests |,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.

Impact Crushing vs. Cone; The Effect on Aggregate LA

Impact Crushing Vs. Cone; The Effect On Aggregate LA

the main influence on the si index is from the material itself, however the impact crushing action causes the material to fragment along natural lines, rather than being sheared off in a cone crusher.,raptor 900 cone crushers - flsmidth,as indicated above for 100 lbs. per cubic foot and impact work index of 13. short tons per hour based on open circuit crushing with material weighing 100 pounds per cubic foot.

crush/overview.md at master · liljencrantz/crush · GitHub

Crush/overview.md At Master · Liljencrantz/crush · GitHub

crush supports named and unnamed arguments. it is often possible to use one, the other or a combination of both. the following three invocations are equivalent. http uri='http://example.com' method='get' http 'http://example.com' 'get' http 'http://example.com' method='get'.,impact of physical and mechanical properties of …,based on a large number of tests, bond introduced a working index or comminution parameter that represents the resistance of the material to crushing and grinding. characterization of rocks for selection of crusher can be done in different ways, and the most commonly used is bond work index

Crushing work index Calculation - Crushing, Screening

Crushing Work Index Calculation - Crushing, Screening

the paper by angove & dunne (1997) reports a standard deviation in crushing work index tests across laboratories as 4.5. the laboratory cwi value of 27.4 (metric) is almost within 4.5 units of the 22.4 value i calculated, so what you are observing is probably the natural variation in the crushing test.,size reduction and energy requirement - sciencedirect,according to chakrabarti, the work index of an unknown rock material can be obtained by first crushing the rock to less than 3327 μm, avoiding over crushing by using low energy impact or compression and by closing the circuit with a 3327 μm screen.

7 LAB TESTS ON AGGREGATE TO CHECK QUALITY FOR USE IN ROAD WORK

7 LAB TESTS ON AGGREGATE TO CHECK QUALITY FOR USE IN ROAD WORK

then crushed aggregates are then sieved through 2.36 mm sieve and weight of passing material (w2) is expressed as percentage of the weight of the total sample (w1) which is the aggregate crushing value. aggregate crushing value = (w1/w2)*100. a value less than 10 signifies an exceptionally strong aggregate while above 35 would normally be regarded as weak aggregates. also read:,aggregate crushing value test - procedure and result,aggregate crushing value formula is given below, aggregate crushing value = (w3 / w) or w3 / (w2 – w1) w1 = empty weight of cylindrical measure. w2 = weight of aggregate with cylindrical measure. w = w2 –w1 = weight of aggregate sample. w3 = weight of crushed aggregate sample passed through 2.36 mm is sieve.

Aggregate Crushing Value - engineeringcivil.com

Aggregate Crushing Value - Engineeringcivil.com

aggregate crushing value this test helps to determine the aggregate crushing value of coarse aggregates as per is: 2386 (part iv) – 1963. the apparatus used is cylindrical measure and plunger, compression testing machine, is sieves of sizes – 12.5mm, 10mm and 2.36mm,pavement materials: aggregates,the crushed aggregate is allowed to pass through 2.36 mm is sieve. and the impact value is measured as percentage of aggregates passing sieve (w2) to the total weight of the sample (w1). aggregate impact value = w1 w2 100 aggregates to be used for wearing course, the impact value shouldn’t exceed 30 percent. for bituminous

Aggregate Crushing Value - engineeringcivil.com

Aggregate Crushing Value - Engineeringcivil.com

aggregate crushing value this test helps to determine the aggregate crushing value of coarse aggregates as per is: 2386 (part iv) – 1963. the apparatus used is cylindrical measure and plunger, compression testing machine, is sieves of sizes – 12.5mm, 10mm and 2.36mm,size reduction equipment - bit mesra,•it is desired to crush 10 ton/hr of iron ore hematite. the size of the feed is such that 80% passes a 72.6 mm screen, and 80% of product a 3.175mm screen. calculate the gross power requirement for wet grinding and dry grinding. work index of hematite is 12.68 [ans 17.96kw]

PROPERTIES AND TESTING OF AGGREGATES FOR PAVEMENT WORKS

PROPERTIES AND TESTING OF AGGREGATES FOR PAVEMENT WORKS

apply the load at uniform rate of 40 tonnes load in 10 minutes. then stop the machine and crushed aggregate is sieved through 2.36mm sieve and aggregate passing 2.36mm sieve is weighed. aggregate crushing value can be obtained from below formula: aggregate crushing value = (w2/w1) *100 %,section 820 - crushed concrete for pavement subbase …,plasticity index (max) 6 10 20 california bearing ratio (%) (min) (1) 100 80 20 los angeles abrasion loss (max) 35 40 45 flakiness index 35 - - note: (1) value applicable to material passing 19.0 mm sieve: initially at optimum moisture content and 98% of maximum dry density as determined by test using

SECTION 812 - CRUSHED ROCK FOR PAVEMENT BASE AND …

SECTION 812 - CRUSHED ROCK FOR PAVEMENT BASE AND …

plasticity index shall initially be targeted to the middle of the range. (++) value applicable to material passing 19.0 mm sieve: initially at optimum moisture content and 98% of maximum dry density as determined by test using modified compactive effort, but then soaked for four days prior to the cbr test.,pavement materials: aggregates,then crushed aggregates are then sieved through 2.36 mm sieve and weight of passing material is expressed as percentage of the weight of the total sample which is the aggregate crushing value. a value less than 10 signifies an exceptionally strong aggregate while above 35 would normally be regarded as weak aggregates.

QUICK METHOD FOR BOND WORK INDEXAPPROXIMATE VALUE

QUICK METHOD FOR BOND WORK INDEXAPPROXIMATE VALUE

abstract: the bond work index is a measure of ore resistance to crushing and grinding and is determined using the bond grindability test. its value constitutes ore characteristic and is used for industrial comminution plants designing. determining the bond work index value is quite complicated, time-,crusher wear parts,bond work index the amount of energy required by plant to crush material los angeles value the los angeles test is commonly used to evaluate the hardness of aggregates to find the suitability of aggregates for use in road construction. therefore, the road aggregates should be hard enough to resist abrasion. ucs (uniaxial compressive strength)

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