Definition, objectives of size reduction and size separation, factors affecting size reduction, laws governing energy and power requirements of mills including ball mill, hammer mill, fluid energy mill etc., sieve analysis, standards of sieves, size separation equipment shaking and vibrating screens, gyratory screens, cyclone separator, air separator, bag filters, cottrell precipitator ...
Milling – Rod / Ball Mills including Bond Ball Work / Grindability Index MARC Manufactures and supplies a wide range of ball and rod mills to suit most metallurgical laboratory applications. Our range extends from small 6L jartype mills that are manually positioned on rollers to large 30L size mills.
Rittinger's, Kick's and Bond's laws express work input as work index (W i) times a particle size function. It is proposed that these laws are only particular cases of more general expressions having the particle size function raised to an exponent,, the work exponent (W e).
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The grinding jar for the Bond Index Rod Mill is 12″ x 24″ in size and has a waveshaped design. At least 15 to 20 kg sample material is required to simulate a closed grinding circuit in a ball or rod mill. The Rod Mill Work Index (RWI) is used for particle size determination in a size range from 25 mm down to mm whereas Ball Mill Work Index (BWI) is used for the range from mm down to 100 µm. Adjustment of .
Figure 2 Scatterplot of Leeb hardness versus Bond ball work index. The tests demonstrated that the Equotip can be used to map hardness variations in drill core at a scale that can be correlated against comminution test data and geological logs.
A Bond Ball Mill Work Index may also be used in the simulation and optimisation of existing mill(s) and the associated grinding circuit(s). Sample Requirements: A minimum of 10 kg of material crushed to nominally minus 10 mm is preferred. JKTech would stage crush the sample to minus mm, as required for the Bond Ball Mill Work Index test feed.
In ball mill laboratory tests 25mm balls in a small laboratory ball mill have different trajectories and interact differently with the shell lifters and ore particles than in a large production ball mill. Additionally while techniques like the Bond Work Index and "scale up factors" are useful for coarse grinding, they can significantly underestimate grinding needs below 100 microns.
Features: transmission adopts largescale double row selfaligning roller bearing instead of sliding bearing, which is easy to start and saves energy up to 2030% 2 Grinding ball mill adopts groovetype circular lining plate to increase contacting areas of iron balls and ores, which enhances grinding action and ore lifting capacity...
Bond Work Index values (Bond, 1953) Split Hopkinson pressure bar test ... Ball mills for cement Ball/tube mills for coal Ball mills for ores Autogenous/semiautogenous grinding mills Rod mills ... Process development and circuit design Sample selection and test work Design criteria Flow sheet options
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The ore properties passing through an AG/SAG mill often changes unexpectedly. If it does, you need a test that you can do in the lab on site to quickly predict what you can do to prevent losses. In this exercise you can simulate the effect of a different Bond Work Index.
Ball Mill Design Manufacturing Our combined experience in ball mill design and process equipment development totals more than 60 years and allows us to put a unique spin on steel and lined mills. Particle size reduction of materials in a ball mill with the presence of metallic balls or other media dates back to the late 1800's.
The guideline reviews the data required for the analysis, including hardness characterization data generated from the SMC Test® and Bond Ball Mill Test Work Index, presents the Morrell equations and their applications, and provides a worked example.
Bond's work index which is defined as the resistance of the material to grinding. The standard equation used by them for the ball mill work index (Bond work index) is as follows.
New and Used Ball Mills for Sale Savona Equipment is a new and used Ball Mill supplier ball mill is a type of grinder used to grind materials into extremely fine powder for use in mineral dressing processes, paints, pyrotechnics, ceramics and selective laser sintering.
from to 34 kWh/t and Bond ball mill work index values vary from 6 to 24 kW/t for the same ores. Project design tonnages varied from 200 to 150,000 t/d, SAG mill sizes varied from 10 ft to 40 ft diameter in multiple SAG mills, and ball mill sizes varied from 7 ft to 27 ft in diameter.
1983: Conceptual study and pilot plant test work for the first 36 ft dia. SAG Mill with a GMD (Gearless mill drive, or ring motor) at 15,000 hp and commissioned in 1991. 1986: Development and successful implementation of a Bond Work Indexbased methodology for estimating power requirements for SAG milling and secondary Ball milling.
The EDEMET Bond Mill is designed to perform the Bond ball mill work index test to determine the grinding energetic consumption of diverse minerals. As this is a standard test its design has been maintained according to the traditional equipment.
Sep 08, 2013· The difference between the Energy Index and the Bond Work Index is that the Bond index is intended for use with actual mills whereas the Energy Index is directly obtained from the results of laboratory mills. However, the Energy Index is directly related to the Bond Work Index by the formula;.
Jul 31, 2014· The following modified Bond equation was proposed for crushing (Magdalinovic, 1990): Wc = cP A Wi ( cP 10 cF 10 ) (8) where: Wc is energy consumed for clinker crushing (kWh/t), Wi is Bond ball mill work index (kWh/t), Pc is sieve size passing 80% of the clinker after crushing (µm), Fc is sieve size passing 80% of the clinker before crushing (µm), A is an empirical coefficient, dependant .
The results of the laboratory ball mill test were compared to the results of an industrial grinding test, the Bond Work Index, for six samples which covered the grindability range. The two tests compared well with a correlation coefficient greater than
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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 (Ai).