4. Theories of Comminution.pdf - Theories of Comminution ...
26 Applicability of Energy Laws • For Crushing (>1cm)→ KICK's • For Rod Mill and Ball Mill grinding → BOND's • For Fine Grinding (10 - 1000μm) → RITTINGER's • For ranges approaching grinding limit → No practical application!
bond crushing law in ball mill
Grindability Index Test Method & Procedure - 911 Metallurgist. The proposed grindability test uses the Bond standard test mill and a quantity called ... that the orcs concerned do not conform to the Bond Law of Comminution. " .... required for many crushing and grinding operations. ... in stages to finer than 6 mesh (3,35 mm), and ground under specified conditions in a laboratory ball mill,.
Size reduction (GIKI) - SlideShare
• Bond has suggested a law intermediate between Rittinger's and Kick's laws, by putting p = −3/2 in the general equation: • Writing C = 5Ei then: • Bond terms Ei the work index, and expresses it as the amount of energy required to reduce unit mass of material from an infinite particle size to …
11 Crushing and classification
where Wi is the Bond Work Index, again in energy per unit mass terms. The index is defined as the energy required to crush from infinite size down to 100 µm, hence the 10 inside the brackets. Bond's Work Index values, in kWh per short ton: i.e. 2000 lbs or 907 kg, roughly follow the Moh's scale of hardness, see Table 11.1.
The work index in Bond's law for crushing of solids has ...
Category: Chemical Engineering Mcqs, Published by: T-Code Scripts. MCQs: The half life period of a radioactive substance is best determined by counting the number of alpha particles emitted per second in a Geiger Muller counter from its known quantity. If the half life period of a radioactive substance is one month, then____________?
CPE: Lesson 15. Empirical laws of Size Reduction
A material consisting originally of 20 mm particle crushed to an average size of 5 mm and required 30 kJ/kg for this size reduction. Determine the energy required to crush the material from 20 mm to 3 mm assuming (a) Rittinger's law, (b) Kick's law and (c) Bond's Law. Solution: (a) Applying Rittinger's law as expressed by equation (4.10)
How it Works: Crushers, Grinding Mills and Pulverizers ...
Bond's Law states that the total work input represented by a given weight of crushed product is inversely proportional to the square root of the diameter of the product particles. Bond's Law can be written as: E = E i (100/L 2) 1/2 [1 - (1/q 1/2 )]
crushing laws and work index free pdf - BINQ Mining
Mill (grinding) – Wikipedia, the free encyclopedia. Historically mills were powered by hand (mortar and pestle), working animal ( horse mill), wind … 1 Grinding laws; 2 Grinding machines … E is the energy ( kilowatt-hours per metric or short ton); W is the work index measured in a … within it; material to be crushed is shoved underneath the wheels using attached plow blades.
Chemical Engineering Stop: Bond's law
Where Kb is a constant that depends on the type of machine and on the material being crushed. To use this equation, a work index Wi is defined as the gross energy requirement in kilowatt-hours per ton of feed needed to reduce a very large feed to such a …
Bond Work Index - an overview | ScienceDirect Topics
The Bond work index ( Bond, 1960) is based on Bond's law, which states that the energy consumed is proportional to the 1.5 power of particle size rather than the square of Rittinger's law. Accordingly, the energy consumed in reducing the particle size from x F to …
The constants (Kb Kr and Kk) used in the laws of
The constants (Kb, Kr and Kk) used in the laws of crushing (i.e., Bond's law, Rittinger's law and Kick's law) depend upon the a) Feed material b) Type of …
what is bond s law of crushing - MC World
2.14 Size ranges applicable to Von Rittinger, Kick, and Bond equations . laws to primary crushing equipment processing large particle feed sizes is. Bond F.C., 1961. Crushing and Grinding…. Hydrocone crusher lor tertiary crushing 01 Semi-Taconite are (specular hematite). It follows a power law defined by the GATES-GAUDIN-SCHUHMANN.
bond crushing work index mobile crushers all
Ball Mill. Ball mills are used primary for single stage fine grinding, regrinding,…
Rittinger - an overview | ScienceDirect Topics
Bond's Table II [BON 54] gives a correction coefficient for the mill's shaft energy according to the latter's type and φ.. 2) Milled output with a size that is less than 70 μm:. The reference value W i must be multiplied by an enhancing coefficient [BON 54, p. 384].. 3) Wet grinding and dry grinding: Dry grinding requires more energy than wet grinding.
Crushing Theory | PDF | Mill (Grinding) | Applied And ...
Bond's Law • The 80% passing size of the product may be calculated from the following Bond equation: 𝑃 in. = 𝑶33 𝑋 0.04 𝑊𝑖 + 0.40 In which the characteristics of the material are taken into consideration by the work index factor Wi and O33, the open side setting of the crusher …
Chemical Engineering Stop: Rittinger's and Kick's laws
Rittinger's and Kick's laws. Rittinger's law states that work required in crushing is proportional to the new surface created. In other words, crushing efficiency is constant and for a given machine and feed material is independent of the sizes of feed and product. Rittinger's law is written as-. P/ ṁ = Kr (1/Dsb – 1/Dsa) Kick ...
CORRELATION BETWEEN BOND WORK INDEX AND …
Table 1 Bond mill charge distribution Ball diameter, inch No. of balls Distribution, % 1 ½ 25 8.8 1 ¼ 39 13.7 1 60 21.0 7/8 68 23.9 3/4 93 32.6 The standard Bond grindability test is a closed-cycle dry grinding and scree ning process, which is carried out until steady state conditions are obtained [11-14].
Relationships between comminution J energy and product ...
size reduction circuits (Charles, 1957). 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 ...
Work given by bond crushing law
Work given by bond crushing law Products. As a leading global manufacturer of crushing, grinding and mining equipments, we offer advanced, reasonable solutions for any size-reduction requirements including, Work given by bond crushing law, quarry, aggregate, and different kinds of minerals.
Bond's law | Article about Bond's law by The Free Dictionary
Bond's law. [ ′bänz ′lȯ] (mechanical engineering) A statement that relates the work required for the crushing of solid materials (for example, rocks and ore) to the product size and surface area and the lengths of cracks formed. Also known as Bond's third theory.
4 Size reduction - UB
2. Rittinger's law states that the energy required for size reduction is proportional to the change in surface area of the pieces of food (instead of a change in dimension described in Kick's law): E KR 1 d2 1 d1 4 2 where KR Rittinger's constant. 3. Bond's law is used to calculate the energy required for size reduction from: E W 100 d2 ...
Quantifying the energy efficiency of fine grinding ...
Figure 2 - Comparison of the OWi and SSE75 of the SAG and ball mill for 10 surveys conducted on the same circuit at different times. Bond's method of quantifying size reduction by measuring the F 80 and P 80 relies on parallel particle size distributions in log-log space (see Figure 3). The Gates-Gaudin-Schumann (GGS) ideal power law size ...
bonds equation crushing - Mine Equipments
What is bond's law of crushing - Wiki Answers Where Kb is a constant that depends on the type of machine and on the material being crushed. To use ... Comparison of Ore Hardness Measurements for Grinding Mill ... standard Bond crushing, and rod mill work indices, abrasion indices and by .....
Rock Crushing Theory and Formula using Kick & …
"The work done in crushing is proportional to the surface exposed by the operation; or, better expressed for this purpose, the work done on a given mass of rock is proportional to the reciprocal of the diameter of the final product, assuming that all the mass has been reduced to one exact size, which is only theoretically possible."
Size Reduction Equipment
running the mill empty. Calculate the power consumption if 12 tonnes/h of this product is further crushed to 5 x 10 (-4) m size in the same mill? Assume that Rittinger'slaw is applicable. •It is desired to crush 10 ton/hr of iron ore hematite. The size of the feed is such that 80% passes a 72.6 mm screen, and 80% of product a 3.175mm screen.
Bond Index Ball Mill / Rod Mill BT 100 XL - RETSCH
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 constants (Kb, Kr and Kk) used in the laws of crushing ...
MCQs: The constants (Kb, Kr and Kk) used in the laws of crushing (i.e., Bond's law, Rittinger's law and Kick's law) depend upon the_____? - Chemical Engineering Mcqs - …
Bond Work Index Formula-Equation
what is bond s law of crushing - MC World Mobile Crushers the crushing equipments for rocks and construction waste. Stationary Large primary jaws and gyratories to cones and vsi. Grinding Mill A powdering process of many kinds of minerals. Screening Ceparate the …
Unit Operations in Food Processing - R. L. Earle
Equation (11.2) is a statement of Kick's Law. It implies that the specific energy required to crush a material, for example from 10 cm down to 5 cm, is the same as the energy required to crush the same material from 5 mm to 2.5 mm. ... In Bond's equation, if L is expressed in microns, ... A major application is in the cane sugar industry, where ...
Rock Crushing Theory and Formula using Kick & Rittinger's Law
Rittinger's theory and law of the energy expended in crushing of rock is that the work of crushing is proportional to the reduction in diameter; or, as I have more fully expressed it: "The work done in crushing is proportional to the surface exposed by the operation; or, better expressed for this purpose, the work done on a given mass of rock is proportional to the reciprocal of the ...