Sep 06 2019 how to calculate bond total return a corporation issues a bond to raise money to run a business government entities issue bonds to fund capital projects such as a new highway the bond issuer is the debtor and a bond investor is the,How to calculate mill bond or work index.
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Get Latest PriceAs alex told you the crushing work index you calculated appears mostly correct the only correction factor that might affect the calculation is to correct for the efficiency of the motor the work index is based on motor output pinion power whereas the measurement of motor power is usually based on motor input power
More DetailsAccording to the bond standard procedure the work index is determined by simulating a dry grinding in a closed circuit in the bond ball mill to achieve 250 circulating load bond 1949 1952 1961 the test is performed on a raw material approximately weighing 10 kg which coarseness is 100 3327 mm
More DetailsThe basic parameters used in ball mill design power calculations rod mill or any tumbling mill sizing are material to be ground characteristics bond work index bulk density specific density desired mill tonnage capacity dtph operating solids or pulp density feed size as f80 and maximum chunk size product size as p80 and maximum and
More DetailsThe standard bond ball mill work index test procedure is firstly to stage crush the feed to minus 335mm and size a representative sample the test then involves a series of batch grinds in a standard bond mill a bond mill is 0305m by 0305m with rounded corners a smooth lining and runs at 70rpm the charge consists of 285 balls weighing a
More DetailsThe basic parameters used in ball mill design power calculations rod mill or any tumbling mill sizing are material to be ground characteristics bond work index bulk density specific
More DetailsThe standard equation used by them for the ball mill work index bond work index is as follows bond proposed equation 1 to calculate work which how to calculate crusher work index iron ore crusher the work index bond 1952 is the work input in kilowatt hours per ton required to
More DetailsHow do bond etfs work fund managers often must pick and choose which securities in the bond index to include in the etf theyll opt for bonds that provide the most representative sample of
More DetailsBall mill power calculation example a wet grinding ball mill in closed circuit is to be fed 100 tph of a material with a work index of 15 and a size distribution of 80 passing inch 6350
More DetailsHow to calculate the issue price of a bond april 02 2019 steven bragg the issue price of a bond is based on the relationship between the interest rate that the bond pays and the market interest rate being paid on the same date
More DetailsLearn how to calculate the real yield of an inflationadjusted bond such as the us treasury inflationprotected security tips
More Details2 the operating work index wio of an existing grinding circuit can be calculated given known mill power draw throughput feed and product size distributions kwht power applied per ton of feed to the grinding unit wi the standard bond work index of the ore p 80 the 80 cumulative passing size of the product in microns f 80
More DetailsFor a known value of the work index wi eq 1 can be used to calculate the energy consumption for any size of feed ore and grinding product however it is more complex in practice because wi is not a material constant but changes with the size of the reference grinding product
More DetailsThe mill rotates on rolls and its frequency is set to 70 rpm corresponding to 85 of the critical frequency the mill power is 225 watts calculated by 6 fi p nally the product is wet screened to find the size d80 24 rod mill semi continuous process the same mill is used for the semi continuous grinding
More DetailsBond rod mill grindability test the test determines the bond rod mill work index which is used with bonds third theory of comminution to calculate net power requirements when sizing ball mills various correction factors may have to be applied the test is a closedcircuit dry grindability test performed in a standard rod mill
More DetailsTo calculate the kicks and rittingers coefficients following formulas can be used with the limits of bonds range upper d bu 50 mm and lower d bl 005 mm
More DetailsCalculate a mills operating work index grate discharge mills will not face this issue c this value represents the volumetric fractional filling of the voids in between the balls by the retained slurry in the mill charge as defined this value should never exceed 100 but in some cases particularly in grate discharge mills it could be lower
More DetailsThe ball mill work index is con rmed at 16 kwht the operating work index though is in the range of 21 kwht to 25 kwht showing high inef ciency this raises the point that in some cases the bond ef4 oversize factor calculation is not suf cient to compensate for the milling inef ciencies that arise
More DetailsQuestion the ore fed to a rod mill has a bond work index of 175 kwht1 the p80 of feed to the mill is 425 cm and the p80 of the product from the mill is 0185mm calculate the work required to grind the ore to the product size as well as the reduction ratio
More DetailsSep 10 2019 an example of a bond would work something like this the issuing entity lets say a corporation such as ford motor company is offering bonds that pay 7 percent interest for 30 years the bond investor decides she wants to buy a 10000 bond she sends the 10000 to ford and receives a bond certificate in return
More DetailsThe work required to form particles of size dp from a very large feed is proportional to the square root of the surfacetovolume ratio of the product sp f s 6dp it follows that
More DetailsFine ore work index kwhtonne p 1 closing screen size in microns gbp net grams of screen undersize per mill revolution p 80 80 passing size of the product in microns f 80 80 passing size of the feed in microns note that the bond ball work index test
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