Bond Work Index Formula-Equation - Mineral Processing & Extractive Metallurgy - Free download as PDF File (.pdf), Text File (.txt) or read online for free. work index Bond Work Index Equation is: 𝑾= 𝑾𝒊 𝑷𝟖 − 𝟖 Where W is the work input (kWh/t), W i is the Work Index (kWh/t), and F 80 and P 80 are the 80% passing size of the feed and product (µm) respectively. Bond Work Index W i can be found through the following equation: 𝑾𝒊= . 𝑷 . .𝟖 grinding cycles. The Bond Work Index is calculated using the formula: 𝑖=1,1 44,5 𝑃𝑐 0,23𝐺,82(10 √𝑃80 −10 √𝐹80) (1) where W i – Bond work index (kWh/t) P c – test sieve mesh size (µm) G – weight of the test sieve fresh undersize per mill revolution (g/rev) F 80 – sieve mesh size passing 80% of the feed before grinding(µm) P 80 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 Bond 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 article. Hence, the price of the bond calculation using the above formula as, Bond price Equation = $104,158.30 Since the coupon rate is higher than the YTM, the bond price is higher than the face value and as such, the bond is said to be traded at a premium.
Second, calculate the Bond Standard Circuit Work Index (WISTD) for the material being processed, which is equal to its combined laboratory Work Index (Lab The new equations were suggested by some investigators to decrease the work index estimation error. In many investigations, bond work index have been used to Bond work index (in kilowatt hours per metric ton ore),. 3 a constant for any product discard size, is calculated from the following Bond-derived (5) equation: W. Apr 26, 2016 Standard drop weight, SMC, and Bond ball work index tests have Bond [2] initially introduced the work index concept (Equation (1)) for an
Jun 1, 2019 The Bond Ball Mill Work Indices of the blends tested were between. 16.4 kWh/t Equation 1, W is the specific energy or work done,. Wi is the Key Words: Comminution Tests, Bond Work Indices, JKTech, Grinding Mill Design, standard Bond crushing, and rod mill work indices, abrasion indices and by The use of Bond equations to calculate pinion energies in ranges where the The work index of the sulphide ore has reduced from 11.22kwhr/sht to. 9.38 Kwhr /sht, 8.19kwhr/sht, Bond's third equation stated that: Wr = Wt = Wir. -. Where,. size of 0.83 mm to a product 80 percent passing size of 75 microns. Use the Bond Work Index formula to determine the Work Index of the new ore sample. test using ball-race test mill was performed. Knowing the Hardgrove indices, the Bond work indices of some samples were estimated using the Aplan's formula. using Bond's formula with the reference work index of 11.25 kW/STPH. accurate values of sodium feldspar's work indices, the time-consuming Bond procedure The work index is computed using the following empirical equation revised by Bond in 1960, where the sieve opening at which the test is made, (microns). 358.
Jan 18, 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:. test work. Bond work indices, obtained from bench-scale or pilot- plant crushability and grindability tests are used in the fol- lowing Bond equation (Bond , 1960) Oct 20, 2015 The Bond work index – so crucial to comminution planning become engineering practice which was based on measurement and calculation. The Bond Ball Mill Work Index is a measure of the resistance of the material to grinding in a ball mill. It can be used to determine the grinding power required for Fur- thermore, the grinding kinetics and mass balance equations were applied to model the standard Bond Keywords: rod-mill work index. For comparing the As a fast method, the determination of the Bond index from the Hardgrove index ( by calculation) is almost matching with measured Bond's work index. test is stated in (Bond) 1961. The work index for a ball mill,. Wi, is then calculated from the following equation. [7] where P is the closing sieve size ( m), Gbp is
test is stated in (Bond) 1961. The work index for a ball mill,. Wi, is then calculated from the following equation. [7] where P is the closing sieve size ( m), Gbp is After determining the Bond work index, the specific comminution capacity is calculated using the following formula, factoring in various correction factors Second, calculate the Bond Standard Circuit Work Index (WISTD) for the material being processed, which is equal to its combined laboratory Work Index (Lab The new equations were suggested by some investigators to decrease the work index estimation error. In many investigations, bond work index have been used to Bond work index (in kilowatt hours per metric ton ore),. 3 a constant for any product discard size, is calculated from the following Bond-derived (5) equation: W. Apr 26, 2016 Standard drop weight, SMC, and Bond ball work index tests have Bond [2] initially introduced the work index concept (Equation (1)) for an