Bond work index calculation example
Efficient grind was undertaken by smaller charges than that recommended by Bond's ball sizing formula, and. •. Operating work index analysis confirming the 9 Sep 2017 determine the Bond's work index of the lead ore. The samples were crushed, ground and pulverized using a ball mill. The sieve analysis for 21 Dec 1984 calculated from the results of Bond standard grindability tests on various mills and to one sample of sand, and goori agreement was found The Bond Work Index is determined by a standardized procedure in vhich the 20 Oct 2015 The Bond work index – so crucial to comminution planning become engineering practice which was based on measurement and calculation. The bond work index was used to estimate the energy efficiency by. Desmond [ 17]. Musci and et. al [18] found grindability characteristics of lateritic and karst. index (by calculation) is almost matching with measured Bond's work index. The Bond's grindability test can be used to determine the work index of any type of and corrected operating Bond work index subsequently were calculated to be 16.8 and 21.47 (kwh/t), This survey would determine the problems of the circuit.
See this useful summary Table of Bond Work Index by Minerals. 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. The sample was received crushed appropriately for the ball mill test.
A quick procedure with two grinding cycles for the determination of the Bond work index approximate value is exactly the same as in the first two grinding cycles of the standard Bond test and consists of the program. Prepare a sample, the same as for the standard Bond test (grind to 100% -3.327 mm). 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. An example of a bond would work something like this: The issuing entity, let's 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 $10,000 bond. She sends the $10,000 to Ford and receives a bond certificate in return. Example of an Index-Linked Bond. Consider two investors—one purchases a regular bond and another buys an index-linked bond. Both bonds are issued and purchased for $100 during July 2019, having the same terms—4% coupon rate, 1 year to maturity, and $100 face value. The CPI level at the time of issuance is 204. Bond Pricing and Yield – Discount Bonds Bonds are at a discount to par when the YTM is greater than the Coupon Rate and are at a premium to par when the YTM is lesser than the Coupon Rate.. Bond Pricing Calculation in Excel. Let us look at Bond Pricing calculation in Excel. Assume ABC Inc.’s bonds are issued at a par of $100 with a YTM of 5% pa semi-annually compounded for 3 years. The above bond valuation formula assumes that the bond is a ‘fixed bond’s., has fixed cash flows or coupon payments. When people talk about bonds, they generally talk about fixed bonds unless mentioned otherwise. The YTM on the bond assumes that the Cash Flows/Coupon Flows are reinvested at the YTM rate. The Bond Index conforming rod charge consists of: 6 rods of 1.25“ diameter and 21“ length; 2 rods of 1.75“ diameter and 21“ length; The grinding jar for the Bond Index Rod Mill is 12″ x 24″ in size and has a wave-shaped design. At least 15 to 20 kg sample material is required to simulate a closed grinding circuit in a ball or rod mill.
Efficient grind was undertaken by smaller charges than that recommended by Bond's ball sizing formula, and. •. Operating work index analysis confirming the
22 Sep 2017 This Grindability Test or Bond Ball Mill Work Index Procedure is used to determine the Bond Work Index of minus six mesh or finer feed ore An alternative approach to determine the effect of closing screen size on the Bond ball mill work index (BWi), in the absence of extensive test work, is to use 3 May 2016 The Bond standard method requires 7–10 grinding cycles. The Bond Work Index is calculated using the formula: = 1,1. 44,5. .
1 Jan 1989 formation, the equation can be used to determine the. Work Index for the material concerned. This Work Index is known as the Operating Work
An alternative approach to determine the effect of closing screen size on the Bond ball mill work index (BWi), in the absence of extensive test work, is to use 3 May 2016 The Bond standard method requires 7–10 grinding cycles. The Bond Work Index is calculated using the formula: = 1,1. 44,5. . 18 Jan 2017 PDF | The Bond work index is a measure of ore resistance to crushing and grinding The Bond Work Index is calculated using the formula:. It starts with Bond's Work Index equation: w1 For example, a grinding circuit is processing 450 t/h (of dry feed) with a mill drawing 3,150 kW (at the pinion). A Bond Ball Mill Index Test (BBMWI) is a standard test for determining the Ball Mill Work Index of a sample of ore. The BBMWI is a measure of the resistance of required for crushing and grinding is presented by the Bond work index and is values calculated according to the mass fraction of the sample components.
The above bond valuation formula assumes that the bond is a ‘fixed bond’s., has fixed cash flows or coupon payments. When people talk about bonds, they generally talk about fixed bonds unless mentioned otherwise. The YTM on the bond assumes that the Cash Flows/Coupon Flows are reinvested at the YTM rate.
Example of an Index-Linked Bond. Consider two investors—one purchases a regular bond and another buys an index-linked bond. Both bonds are issued and purchased for $100 during July 2019, having the same terms—4% coupon rate, 1 year to maturity, and $100 face value. The CPI level at the time of issuance is 204. Bond Pricing and Yield – Discount Bonds Bonds are at a discount to par when the YTM is greater than the Coupon Rate and are at a premium to par when the YTM is lesser than the Coupon Rate.. Bond Pricing Calculation in Excel. Let us look at Bond Pricing calculation in Excel. Assume ABC Inc.’s bonds are issued at a par of $100 with a YTM of 5% pa semi-annually compounded for 3 years. The above bond valuation formula assumes that the bond is a ‘fixed bond’s., has fixed cash flows or coupon payments. When people talk about bonds, they generally talk about fixed bonds unless mentioned otherwise. The YTM on the bond assumes that the Cash Flows/Coupon Flows are reinvested at the YTM rate. The Bond Index conforming rod charge consists of: 6 rods of 1.25“ diameter and 21“ length; 2 rods of 1.75“ diameter and 21“ length; The grinding jar for the Bond Index Rod Mill is 12″ x 24″ in size and has a wave-shaped design. At least 15 to 20 kg sample material is required to simulate a closed grinding circuit in a ball or rod mill. The work index . W. i. was defined by F. Bond as the specific energy (kWh/ton) required to reduce a particulate material from infinite grain size to 100 microns. The calculation is based on the size-energy relationship . 1,2 21. 11. nn. eC. x , which for . n = 0.5, x. 1 = ∞ and . x. 2 = 100, by definition gives . e ∞,100 = W. i. and consequently . C = 10. W. i
After determining the Bond work index, the specific comminution capacity is calculated using the following formula, factoring in various correction factors 1 Jan 1989 formation, the equation can be used to determine the. Work Index for the material concerned. This Work Index is known as the Operating Work Efficient grind was undertaken by smaller charges than that recommended by Bond's ball sizing formula, and. •. Operating work index analysis confirming the 9 Sep 2017 determine the Bond's work index of the lead ore. The samples were crushed, ground and pulverized using a ball mill. The sieve analysis for