CHAPTER 20: SIZE REDUCTION – EQUIPMENT FOR SIZE

– Rittinger''s constant • For the size reduction of fine powders, in which large areas of new surface are being created, Rittinger''s Law fits the experimental data better. Bond''s law • The work required to form particles of size Dp from very large feed is proportional to the square root of

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Fred Chester Bond (June 10, 1899 – January 23, 1977) was an American mining engineer.A graduate and former professor of the Colorado School of Mines, he worked in the mining equipment and ore milling equipment business of AllisChalmers from 1930 to 1964.

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relatively small, Kick''s Law is a reasonable approximation. For the size reduction of fine powders, on the other hand, in which large areas of new surface are being created, Rittinger''s Law fits the experimental data better. 3) Bond has suggested an intermediate course, in which he postulates that n = 3/2 and this leads to: ''= '' Ü § 5 4 4 Å .

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Metallurgical ContentThe Two Laws:What about Bond?Rittinger''s Law:The CrushingSurface Diagram: 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

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Table 1. Bond''s mill specifiion 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 3 700 Andesite and limestone samples were prepared by crushing in a laboratory jaw

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11 Crushing and classifiion Estimates vary, but it is generally accepted that of all the energy used in the World something like between 1 and 10% is in comminution, i.e. the processes of crushing, grinding, milling, micronising, etc. Changing the size of the particles by crushing

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Mar 25, 2015 · Rittinger''s Law — The energy required for reduction in particle size of a solid is directly proportional to the increase in surface area. E = K R f c (1/L 2 – 1/L 1) Kick''s Law — The amount of energy required to crush a given quantity of material to a specified fraction of its original size is the same, regardless of the original size.

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Calculations involving Bond''s work index are generally divided into steps with a different Wi determination for each size class. The low energy crushing work index laboratory test is conducted on ore specimens larger than 50 mm, determining the crushing work index (Wi

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Chapter 3 Particle Technology (Size Reduction) Kick''s law: the work required for crushing a given mass of material is constant for the same reduction ratio, 3.2.2 Bond crushing law and work index.

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the range of crushing is the range of basic law of Kick. The slope of cumulative curve varies from m = 0 to m 0.1. the range of coarse grinding is the range of Bond''s theory, (rn = — 0.5) and the range of fine grinding is the range of Rittinger''s theory ( m = — 1.0 ). the range of fine grinding from m = —1 to — 3,

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Oct 13, 2018 ·Ł. Kick''s Law 2. Rittinger''s Law 3. Bond''s Law Watch this full video to learn this b.pharma subject online, which comes under unit operation in pharmaceutical engineering. Other Topics in

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Comminution is the reduction of solid materials from one average particle size to a smaller average particle size, by crushing, grinding, cutting, vibrating, or other processes. In geology, it occurs naturally during faulting in the upper part of the Earth''s crust.

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May 14, 2010 · 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.

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FM 306: SIZE REDUCTION AND SIEVING OBJECTIVE The minimum energy required for crushing is the energy required for creating fresh surface. In addition, energy is absorbed by the particulate material due to deformation, n = 3/2, Bond''s Law: 4. Note that the definition of particle size in Bonds law is different: D80= Particle size such that

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Looking for Kick''s law? Find out information about Kick''s law. The law that the energy needed to crush a solid material to a specified fraction of its original size is the same, regardless of the original size of the Explanation of Kick''s law