Quarry rock of 12 in maximum size is to be handled in a two stage crusher plant at the rate of 70 tons per hour The maximum size of output is to be 1 in and separation of materials over 1 in size and the minus 1 in in the output is required Select a jaw crusher like those included in this table.
The screens to be considered are a 1 in screen with an estimated capacity of 2 7 tphsq ft and a 1 in screen with a capacity of 2 1 tphsq ft The solution will include the selection of adequate and economical crushers for the two stages and the sizes of screens between them and below the secondary stage.
For the primary crusher a jaw crusher will probably be most economical A jaw crusher like 2036 in the Jaw Crusher Table here above would be able to take the maximum 12 in size quarry stone but it would not have the required 70 tph capacity needed To have the needed capacity a jaw crusher like the 2042 or 2436 sizeswill have to be selected overloading the secondary crusher.
A grid chart or curve for the selected crusher shows that for a 2 in setting 54 of the material will pass a 1 in screen or 46 will be retained this is like Jaw Crusher capacity table abovewhere 48 passes a 1 in screen The 46 of 70 tph gives the 32 tph fed to the secondary crusher shown in Figure below as a roll crusher.
A twin roll crusher is selected like those given inthe Roll Crusher capacityTable above to serve as the reduction crusher The smallest 24 x 16 roll crusher shown in theRoll Crusher capacity Table above has enough capacity with a setting of 1 in but the maximum size feed will be too large that is the stage of reduction is not large enough The maximum size of feed coming from the discharge of the primary crusher with a setting of 2 is about 3 in as may be found in this Table.
Another possible solution to this problem would be to use a gyratory crusher for the primary crushing stage A gyratory like Telsmith model1110 could be set at 1 in in an open circuit with a capacity for 260 tph The maximum size of stone in the output is estimated to be approximately 2 18 in Then all the output from the primary crusher could be nipped by a 40 in diameter twin roll crusher with a 1 in setting according to the Roll Crusher capacityTable above The specifications and manufactured limitations rather than economy generally govern the selection of crushers.
To find the required areas of screen the rate of feed of material as well as gradation of the feed must be known The 1 in screen under the jaw crusher is the top deckno deck correction factor will be necessary Therefore the 1 in screen will need to be at least 702 7 29 9 sq ft in area It must be at least 36 in wide for an 18 x 36 jaw crusher So a 4 ft by 8 ft screen would be acceptable The 1 in screen is a second deck for the 38 tph from the jaw crusher so the deck correction factor is 0 90 and that screen capacity is 2 1 x 0 9 1 89 tphsq ft.
The screen area needed under the jaw crusher is 381 89 20 1 sq ft For the 1 in screen below the roll crusher the capacity has no correction factor and the area needed is 322 1 15 2 sq ft To handle the output from a 40 x 24 roll crusher the screen will have to be at least 24 in wide Perhaps it will be more effective to use one continuous screen of at least 20 1 15 2 35 3 sq ft A 4 ft by 10 ft 1 in screen should be satisfactory.
Dec 20 2010nbsp018332The benchmark is the fine grind extract that was determined in the laboratory If all of that is extracted the mash efficiency is 100 Conversion efficiency is affected my mash parameters like pH crush diastatic power temperature profile mash.
Volumetric efficiency is determined by dividing the actual flow delivered by a pump at a given pressure by its theoretical flow Theoretical flow is calculated by multiplying the pumps displacement per revolution by its driven speed So if the pump has a displacement of 100 ccrev and is being driven at 1000 RPM its theoretical flow is 100.
Ayhamalquotbanna distinguishedsystemengineer tomcloonan cto networksolutions thespectral efficiencyof docsis1743 1 systems.
Jan 01 2016nbsp018332In this test the energy required to crush a dry ore particle by the impact of two swinging hammers is determined The standard method adopted by Bond is as follows 5 Two equal hammers 13 6 kg each Figure 3 4 about 0 7 m in length and the striking face 50 215 50 mm are suspended from two bicycle wheel rims.
Sep 27 2018nbsp018332Second shifts in the microbial community structure to dominance by organisms that have lower efficiency may also result in concomitant changes in microbial metabolic efficiency 33 35.
Address: Zhengzhou High-tech Industrial Development Zone, China