
(PDF) Comminution energetics part III : Bond's
Comminution energetics part III : Bond's law and breakage energy
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GUJARAT TECHNOLOGICAL UNIVERSITY
To determine Critical index, Work Index, Bond's Law, Rittinger's Law and Kick's Law for Ball mill 5. To determine the screen efficiency for the given sample 6. To determine Rittinger's constant, Bond's constant, Kick's constant and Work Index 7. To determine nip angle, Reduction Ratio, Ribbon Factor, Rittinger's constant, Bond's constant, Kick's constant, Work Index as well
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Orway Mineral Consultants Canada Ltd. Mississauga, ON
BM = Ball mill specific energy from T 80 1.7 mm to final product P 80, using Bond's Law, (kWh/t) W T = Total grinding mill circuit specific energy (kWh/t) Note that K BM is the composite of EF3, EF4 and EF5 factors for ball milling (Rowland, 1982). Morrell and SMCC Morrell (2004) developed a methodology for predicting specific energy with
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CORRELATION BETWEEN BOND WORK INDEX AND MECHANICAL
3 STANDARD BOND TESTS 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 index would be expected to
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Relationships between comminution J energy and product
However Bond's Third Law can be reasonably applied to the range in which ball/rod mills operate in. In spite of the empirical basis of Bond's theory, it is the most widely used method for the sizing of ball/rod mills and has become more likely a standard. The general form of Bond's equation is as follows: [6] where W is the work input (kWh/t); Wi is the work index (kWh/t) which expresses
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TECHNICAL NOTES 8 GRINDING R. P. King
,P S DFW ]RQH 7RH RI KWH RODG &DWDUDFWLQ J)FRV Figure 8.2 Media motion in the tumbling mill. 8.1 Grinding 8.1.1 Grinding action Industrial grinding machines used in the mineral processing industries are mostly of the tumbling mill type. These mills exist in a variety of types  rod, ball, pebble autogenous and semiautogenous. The grinding
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Bond Work Index Tests  Grinding Solutions Ltd
Bond Ball Mill Grindability Test. The Bond Ball Mill Work Index (BBWi) test is carried out in a standardised ball mill with a predefined media and ore charge. The Work Index calculated from the testing can be used in the design and analysis of ball mill circuits. The test requires a minimum of 10kg of sample that has been stagecrushed to passing size of <3.35 mm. Any screen size below
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Based on Bonds Crushing Law the power
• A ball mill is to grind 250 tons/day of calcite having a specific surface of 90.34 sq. cm/g. No recrushing of material. is to be done. Overall energy effectiveness of the ball mill is 7.5%. Rittinger's number for calsite is 1053 cm2/ftlbf. Calculate: a. specific surface area of product b. Theo. hp c. Actual hp
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GUJARAT TECHNOLOGICAL UNIVERSITY
To determine Critical index, Work Index, Bond's Law, Rittinger's Law and Kick's Law for Ball mill 5. To determine the screen efficiency for the given sample 6. To determine Rittinger's constant, Bond's constant, Kick's constant and Work Index 7. To determine nip angle, Reduction Ratio, Ribbon Factor, Rittinger's constant, Bond's constant, Kick's constant, Work Index as well
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QUICK METHOD FOR BOND WORK INDEXAPPROXIMATE VALUE
specification of the Bond mill are given in Table 1. Table 1. Bond's mill specification and grinding conditions Mill diameter, D m, cm 30.48 Mill Length, L m, cm 30.48 Number of mill rotations in minutes, n, min1 70 Mill balls weight, M b, kg 21.125 Geometry of mill liner smooth Grinding type dry V ore, cm 3
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Mill (grinding)  Wikipedia
Industrial ball mills can be as large as 8.5 m (28 ft) in diameter with a 22 MW motor, drawing approximately 0.0011% of the total world's power (see List of countries by electricity consumption). However, small versions of ball mills can be found in laboratories where they are used for grinding sample material for quality assurance.
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Based on Bonds Crushing Law the power
• A ball mill is to grind 250 tons/day of calcite having a specific surface of 90.34 sq. cm/g. No recrushing of material. is to be done. Overall energy effectiveness of the ball mill is 7.5%. Rittinger's number for calsite is 1053 cm2/ftlbf. Calculate: a. specific surface area of product b. Theo. hp c. Actual hp
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Size reduction (GIKI)  LinkedIn SlideShare
• Kick's law: – putting p = −1, then integration gives: – Writing C = KKfc, then Kick's law, is obtained as: – This supposes that the energy required is directly related to the reduction ratio L1/L2which means that the energy required to crush a given amount of material from a 50 mm to a 25 mm size is the same as that required to reduce the size from 12 mm to 6 mm. • Bond's
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AMIT 135: Lesson 7 Ball Mills & Circuits –
For overflow ball mills, the charge should not exceed 45% of the mill volume . For grate discharge mills, the charge should occupy about 50% of the mill volume . Bond developed a relationship that can be used to determine the percent charge by volume as a function of the vertical height above the charge, He, and the radius of the mill, R, i.e.,
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bond work index ball mill  georget
Model Bond Rowland SSAGMILLING COM. Bond ball mill work index Bond rod mill work index Bond crushing low energy impact work index Formulae Rowland 2006 where CF is an optional calibration factor use 1 0 for normal situations The rod mill oversize feed factor EF 4 RM is calculated using the greater of the sample s rod mill or crushing work index which is usually the
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How Bail Bonds Work – Types, Conditions & How
However, the bond agent's fee (the 10% to 15% of the total bail amount) is not returned no matter the outcome. Bond Forfeiture and Bounty Hunters . Should a defendant who used a bond agent's services fail to appear in court or otherwise violate bail terms, the agent can usually try to find the defendant, take that person into custody, and physically take the defendant back to police
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AMIT 135: Lesson 7 Ball Mills & Circuits – Mining
For overflow ball mills, the charge should not exceed 45% of the mill volume . For grate discharge mills, the charge should occupy about 50% of the mill volume . Bond developed a relationship that can be used to determine the percent charge by volume as a function of the vertical height above the charge, He, and the radius of the mill, R, i.e.,
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FM 306: SIZE REDUCTION AND SIEVING
Ball mill is a metal cylinder which rotates about its horizontal axis. The coarse material charged along with the metal balls breaks to fine powder by impact of metal balls. 1. THEORY AND ANALYSIS Significance of the Experiment Size reduction of particle is very important and useful in many chemical and other industries. This is because: •Handling of small particles is easier as compared to
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Bond Index Ball Mill / Rod Mill BT 100 XL 
The grinding jar of the Bond Index Ball Mill measures 12″ x 12″ and has wellrounded corners. Module Rod Mill. Minerals precrushed to < 12.50 mm and sieved ; Drillcore precrushed to < 12.50 mm and sieved ; Half a drillcore precrushed to < 12.50 mm and sieved ; 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
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CORRELATION BETWEEN BOND WORK INDEX AND
3 STANDARD BOND TESTS 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 index would be expected to
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