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The Bond''s standard ball mill is used to determine the work index value of differ ent samples. The Bond work index is defined as the kilowatthours per short ton required to break from infinite size to a product size of 80% passing 100 µm. If the breakage characteristics of a material remain constant over all size ranges, the calcul ated work ...
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Bond''s approach consists of determining the ore hardness characteristics, or Work Index (Wi) via standardized laboratory testwork. The full suite of Bond comminution tests provide the Ball Mill Work Index (BWi), the Rod Mill Work Index (RWi), the Crusher Work Index (CWi) and the Abrasion Index .
W is the work index measured in a laboratory ball mill (kilowatthours per metric or short ton) P 80 is the mill circuit product size in micrometers; F 80 is the mill circuit feed size in micrometers. Rod mill. A rotating drum causes friction and attrition between steel rods and ore particles.
bond rod mill work index on at least one sample tested, and • large variations in abrasion index and crushing work index were due to variations in the test method across the
Bond Rod Mill Work Index, RWi, kWh/t Table 1. Example of AG/SAG Ball Mill Circuit Wio Calculations [1] [2] ABstrAct Optimum use of power in grinding, both in terms of grinding efficiency and use of installed capital, can have a large effect on profitability. Mill operators have long used operating work indices to evaluate grinding circuit
bond ball mill work index – Grinding Mill China. Bond Index Ball Mill PTBBM | Prep Tech CN. The Prep Tech Bond Index Ball / Rod Mill is designed to meet the industrial requirements to grind coal, cement and a wide variety of ores related to the Bond Ball Mill and Bond Rod Mill WORK INDEX This index is used to calculate the power.
Bond Work Index Tests. Grinding Solutions offers a range of Bond Work Index Testing from crushability and abrasion to ball and rod mills. For more information on the tests please see below: Bond Low Energy Impact Test. The Bond LowEnergy Impact test can be used to determine the Crusher Work index (CWi), also known as the Impact Work Index.
Determining the Bond work indexes of a sample involves tests using laboratory scale grinding circuits. A unit weight is determined by achieving maximum packing of the prepared ore sample; the unit weight is then fed into the circuit, with undersized product being replaced by .
The MacPerson Autogenous Grindability Test determines the MacPherson Correlated Autogenous Work Index*. This can be used in conjunction with the Bond Rod and Ball Mill Work Indices to determine power requirements, and to suggest circuit configurations for autogenous grinding (AG) and semiautogenous grinding (SAG) circuits.
Rod Mill Power Draft. Rod mill power is dependent on mill capacity and work index. Mill power increases with: Increasing rod charge; Increasing mill speed; Increasing mill length. Rowland and Kjos (1980) provided an expression to quantify power draw at the pinion shaft per unit mass of rods: P↓M / M↓R = D↑ ( – ↓R) Φ ...
An improved method using less mass compared to the Bond Ball Mill Work Index test. The JK Bond Ball Mill (JKBBM) test, is a locked cycle grindability test conducted using a standard laboratory Bond Ball Mill with the same steel ball charge and material feed size ( passing mm) as the Bond Ball Mill Work Index test.
The work index covering grinding in tumbling mills of coarse sizes is labelled M ia. The work index covering grinding of fine particles is labelled M ib (Morrell, 2008). M ia values are provided as a standard output from a SMC Test® (Morrell, 2004a) whilst M ib values can be determined using the data generated by a conventional Bond ball mill ...
ball mill and can be performed at mesh sizes ranging from 48 mesh to 400 mesh. Bond Ball Mill Work Index (and modified Bond Work Index) data can be used in the CEET® grinding simulator. • The Bond Rod Mill Grindability Test determines the Bond Rod Mill Work Index which is used to determine net power requirements for sizing rod mills. The ...
A New Approach to the Calculation of Work Index and the Potential Energy of a Particulate Material ... factors have been adapted by Bond [5]. The present work is an effort to show that the devia tion of the . W. i. ... tory rod mill and the semi continuous process using the
bond s law for crushing mills 34063 networkcomputerbe. BOND ROD MILL Ore equipment plant bond s law for crushing mills 34063,Comminution | Hazen Research This test determines the Bond Rod Mill Work Index, which can be used with Bond''s Third Theory of Comminution to calculate net power requirements of sizing rod mills The test is a closedcircuit, dry Mill (grinding) Wikipedia, the .
The Bond rod mill work index is not as common as the Bond ball mill work index, and there are two different variations on the mill models expect a mill with a "wave liner", and is not compatible with mills using "smooth liners".
Numerically, the work index is the energy required in kwht to reduce a given material from theoretically infinite feed size to 80 passing 100 micronshe work index of a particular material is determined in the laboratory by conducting the standard bond grindability test bond developed separate tests for the rod mill and the ball mill.
Bond Rod Index Mill, 12" x 24" consisting of a one (1) piece cast shell complete with integral wave, 1 Hp 3/60/220 volt motor/gear reducer drive, support frame which allows the mill to tilt +/ 5 degrees during operation and 45 degrees for discharge (manual operation), receiving pan, rod charge and control panel complete with digital revolution counter, start/stop buttons and emergency ...
Generally, Bond work index is a common method for selecting comminution equipment as well as estimation of grinding efficiency and calculating required power. In the current research, a simple, fast and accurate procedure is introduced to find the rodmill work index based on the conventional Bond work index.
allis chalmers rod mill drawing hasb. SAG Mill Testing Test Procedures to Characteriz, >2,000 Continuous Y Y Bond Rod Mill 0305 127 Any 118 15 10 Lockedcycle Y Y Bond Ball Mill 0305 335 Any 0149 10 5, draw, especially if the AG/SAG mill is designed for a, AllisChalmers Publication 07P1701 Bulled, D Husain, K (2008) The development of a smallscale test to determine work.
rod mill work index has not been de ned as yet. The ball fi mill work index is con rmed at 16 kWh/t. The operating fi work index, though, is in the range of 21 kWh/t to 25 kWh/t showing high ineffi ciency. This raises the point that, in some cases, the Bond EF4 .
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 samples. These equation application methods are used to process <1/2″ ore samples in a Ball Mill using a standard ball charge. Below describes in general terms the Bond Work Index Procedure used by a Professional Metallurgical Testing Laboratory.
Bond Rod Mill Grindability Test. The test determines the Bond Rod Mill Work Index which is used with Bond''s 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.
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