Size reduction is the process of decreasing the physical dimensions of objects or materials by breaking them into smaller pieces. It is done by applying external forces to break larger particles into smaller ones. The main objectives of size reduction are to increase surface area for reactions, separate materials, improve handling and mixing. Some common size reduction methods are impact, compression, shear and attrition. Key factors that affect size reduction are the material's hardness, structure, abrasiveness, softening temperature and moisture content. Several theories describe the energy required for size reduction, including Rittinger's, Bond's and Kick's theories. Only about 10% of the total energy input is actually used to reduce particle size.
Generally, size reduction and size separation are combined to obtain powder with the desired particle size distribution (PSD) for acceptable flow and compressibility for downstream processing . The mechanical process of reducing the particle size of a solid is also called milling.
objectives, applications, mechanism of size separation, the official standard of powders, sieves, sieve shaker, cyclone separator, air separator, bag filter, elutriation tank
size reduction,laws involved in size reduction ,application & millsM Swetha
size reduction basic principles,laws&machanism of size reduction with all mills .I gave a note on size separation .it is very useful for the teaching staff &students of B.pharmacy
Fluid energy mill for pharmacy principles, construction, working, uses, meri...ASHUTOSH SENGAR
this is an slideshare for pharmacy students, principles, construction, working, uses, merits and
demerits of , fluid energy mill its for b. pharm. and M. PHARM
This presentation will help the students of Pharmacy in subjects like Pharmaceutics and industrial pharmacy. Hope you will find it better and helpful.
Regards
Amjad Anwar
email: amjadanwar77@gmail.com
Department of Pharmacy, University Of Malakand
introduction, theory of drying, applications of drying, construction & working about fluidised bed dryer,use of tray dryer,construction about vacuum dryer, construction & working about drum dryer, construction about spray dryer
Introduction
Objectives
Methods of size reduction
Advantages of size reduction
Disadvantages of size reduction
Mechanism of size reduction
Laws governing to the size reduction
Principle of Size Reduction, Construction, working and uses of following-
Hammer mill
Ball mill
Fluid Energy Mill
Edge Runner Mill
End Runner Mill
Size reduction is a process of reducing large solid unit masses, coarse particles or fine particles.
Size reduction may be achieved by two methods:
1] Precipitation
2] Mechanical process
1] Precipitation method: Substance is dissolve in appropriate solvent.
2] Mechanical process: Mechanical force is introduce by using different equipments like ball mill, colloid mill etc.
Generally, size reduction and size separation are combined to obtain powder with the desired particle size distribution (PSD) for acceptable flow and compressibility for downstream processing . The mechanical process of reducing the particle size of a solid is also called milling.
objectives, applications, mechanism of size separation, the official standard of powders, sieves, sieve shaker, cyclone separator, air separator, bag filter, elutriation tank
size reduction,laws involved in size reduction ,application & millsM Swetha
size reduction basic principles,laws&machanism of size reduction with all mills .I gave a note on size separation .it is very useful for the teaching staff &students of B.pharmacy
Fluid energy mill for pharmacy principles, construction, working, uses, meri...ASHUTOSH SENGAR
this is an slideshare for pharmacy students, principles, construction, working, uses, merits and
demerits of , fluid energy mill its for b. pharm. and M. PHARM
This presentation will help the students of Pharmacy in subjects like Pharmaceutics and industrial pharmacy. Hope you will find it better and helpful.
Regards
Amjad Anwar
email: amjadanwar77@gmail.com
Department of Pharmacy, University Of Malakand
introduction, theory of drying, applications of drying, construction & working about fluidised bed dryer,use of tray dryer,construction about vacuum dryer, construction & working about drum dryer, construction about spray dryer
Introduction
Objectives
Methods of size reduction
Advantages of size reduction
Disadvantages of size reduction
Mechanism of size reduction
Laws governing to the size reduction
Principle of Size Reduction, Construction, working and uses of following-
Hammer mill
Ball mill
Fluid Energy Mill
Edge Runner Mill
End Runner Mill
Size reduction is a process of reducing large solid unit masses, coarse particles or fine particles.
Size reduction may be achieved by two methods:
1] Precipitation
2] Mechanical process
1] Precipitation method: Substance is dissolve in appropriate solvent.
2] Mechanical process: Mechanical force is introduce by using different equipments like ball mill, colloid mill etc.
This research paper intends to explore issues of female prostitutes in Pakistan. It will observe prostitution as an institute from way back when Arabs arrived in subcontinent and Muslims ruled in India. Further, it will come to today’s Pakistan and problem of current women who belongs to this profession.
In this slide i have discussed about the size reduction, its objective, mechanism, principle and the different types of equipment used for size reduction and its applications.
This will provide indetail information about Size reduction such as in brief about size reduction, major principles governing to size reduction, Laws for size reduction and Major Size reduction equipment using in food industries,
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Here's a short way to understand the concept of pharmaceutical engineering . Take a look of this amazing ppt who describes the Chapter -2 of Pharmaceutical engineering i.e. Size Reduction.
This seminar provides a very comprehensive and up-to-date overview of the rapidly expanding field of tribology. First friction, wear, and lubrication including a brief historical evolution of tribology over millennia will be introduced and described in detail. Progressively, the properties and main characteristics of tribological surfaces where friction, wear, and lubrication take place will be addressed, also various methods used for measuring surface roughness, mechanical, chemical, and physical properties all of which are critically important for the tribological performance of all moving mechanical systems will be described. A section on friction and wear introduces basic concepts, theories, mechanisms involved and in minimizing friction and wear. The friction and wear of specific material groups or classes are presented to further emphasize the fact each material type or coating can differ from one another in their friction and wear behaviors mainly because of the stark differences in their structural, chemical, mechanical, and physical properties.
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Technical Specifications
Indigenized remote control interface card suitable for MAFI system CCR equipment. Compatible for IDM8000 CCR. Backplane mounted serial and TCP/Ethernet communication module for CCR remote access. IDM 8000 CCR remote control on serial and TCP protocol.
Key Features
Indigenized remote control interface card suitable for MAFI system CCR equipment. Compatible for IDM8000 CCR. Backplane mounted serial and TCP/Ethernet communication module for CCR remote access. IDM 8000 CCR remote control on serial and TCP protocol.
• Remote control: Parallel or serial interface
• Compatible with MAFI CCR system
• Copatiable with IDM8000 CCR
• Compatible with Backplane mount serial communication.
• Compatible with commercial and Defence aviation CCR system.
• Remote control system for accessing CCR and allied system over serial or TCP.
• Indigenized local Support/presence in India.
Application
• Remote control: Parallel or serial interface.
• Compatible with MAFI CCR system.
• Compatible with IDM8000 CCR.
• Compatible with Backplane mount serial communication.
• Compatible with commercial and Defence aviation CCR system.
• Remote control system for accessing CCR and allied system over serial or TCP.
• Indigenized local Support/presence in India.
• Easy in configuration using DIP switches.
Water scarcity is the lack of fresh water resources to meet the standard water demand. There are two type of water scarcity. One is physical. The other is economic water scarcity.
2. What is the meaning of size
reduction ?
Size refers to physical Dimension
of an object.
Reduction refers to decrement or
the process of decreasing the size.
3. Simple definition of SIZE
REDUCTION
Size reduction is the operation carried
out for reducing the size of bigger
particles into smaller one of desired
size and shape with the help of
external forces.
COMMINUTION is another term used for
size reduction.
4.
5. OBJECTIVES OF SIZE REDUCTION
In the materials processing industry, size reduction or
comminution is usually carried out in order to:
Increase the surface area because, in most reactions
involving solid particles, the rate of reactions is directly
proportional to the area of contact with a second phase.
Break a material into very small particles in order to
separate the valuable amongst the two constituents.
Achieve intimate mixing.
To dispose solid wastes easily .
To improve the handling characteristics.
To mix solid particle more intimately.
11. Mechanism of size reduction
Impact —particle concussion by a single rigid
force (hammer).
Compression—particle disintegration by two
rigid forces (nutcracker).
Shear —produced when the particle is
compressed between the edges of two hard
surfaces moving tangentially.
Attrition —arising from particles scraping against
one another or against a rigid surface (a file).
12.
13. Type of impact When impact force
are apply?
Gravity impact
1. In gravity impact ,the free falling material is momentarily
stopped by the stationary object.
2. Example – coal dropped onto a hard steel surface
Dynamic impact
1. Most often used when it is necessary to separate two
material which have relatively different friability
2. The more friable material is broken first
3. Less friable material remains without broken
4. Example – material dropping in front of a moving
hammer
A cubical particle are needed or material too hard
14. When compression forces needed?
If material is hard
If material is abrasive
If the material is not stick
When material will break cubically
Where the finished product is to be relatively coarse in
size
15. Factors affecting size reduction
Hardness:
- It is a surface property of the material.
- It is frequently confused with a property named strength.
- Thus, it is possible for a material to be very hard, but if it is
brittle also then size reduction may present no special problems.
- An arbitrary scale of hardness has been devised known as Moh’s
Scale;
Moh’s Scale = 1 is for graphite
Moh’s Scale < 3 is for soft material
Moh’s Scale > 7 is for hard material
Moh’s Scale = 10 is for diamond
The harder the material the more difficult it is to reduce in size
16. Factors affecting size reduction
Material structure:
Some substances are homogeneous in character.
Mineral substances may have lines of weakness along
which
the materials splits to form flake-like particles.
Vegetable drugs have a cellular structure often leading
to long fibrous particles.
17. Factors affecting size reduction
Abrasiveness:
Abrasiveness is a property of hard materials
(particularly those of mineral origin).
It may limit the type of machinery that can be used.
During the grinding of some very abrasive substances
the final powder may be contaminated with more than
0.1 percent of metal worn from the grinding mill
18. Factors affecting size reduction
Softening temperature:
During size reduction process sometimes heat is generated
which may cause some substances to soften, and the
temperature at which this occurs can be important.
Waxy substances, such as stearic acid, or drugs containing
oils or fats are examples that may be affected.
Some methods can be used to overcome this like cooling
the mill, either by a water jacket or by passing a stream of
air through the equipment.
19. Factors affecting size reduction
Moisture content:
It is found that materials do not flow well if they
contain between about 5 and 50 per cent of moisture.
Under these conditions the material tends to cake
together in the form of balls. In general, grinding can be
carried out satisfactorily outside these limits.
Crushing strength:
The power required for crushing is almost directly
proportional to the crushing strength of the material.
20. Friability:
The friability of the material is its tendency to fracture during normal handling. In
general, a crystalline material will break along well-defined planes and the power
required for crushing will increase as the particle size is reduced.
Stickiness:
A sticky material will tend to clog the grinding equipment and it should therefore
be ground in a plant that can be cleaned easily.
Soapiness:
In general, this is a measure of the coefficient of friction of the surface of the
material. If the coefficient of friction is low, the crushing may be more difficult.
Explosive:
Such materials must be ground wet or in the presence of an inert atmosphere.
Materials yielding dusts that are harmful to the health:
Such material must be ground under conditions where the dust is not allowed to
escape.
21. SIZE REDUCTION THEORIES
The energy requirement for particle size reduction is a
function of input and output of particle size, hardness,
strength and other properties of solids.
Various theories for energy requirement are:-
Rittinger’s theory
Kick’s theory
Bond’s theory.
23. Integrating equation (1),
E= C ln(di/dn) …. (2)
(di/dn) = reduction ratio.
If n=1.0 equation (2) becomes Kick’s theory.
If n=1.5 equation (2) becomes Bond’s theory.
If n=2.0 equation (2) becomes Rittinger’s theory.
24. Rittinger’s theory
According to this theory energy E required for size reduction
of unit mass is directly proportional to the new surface area
produced.
E=KR (Sn – Si) …. (3)
Where
Si = initial surface area
Sn = new specific surface area
KR = Rittinger’s constant.
E= amount of energy
27. 1.
Bond’s work index is the work required
to reduce unit weight from a theoretical
infinite size to 80% passing 100µm.
2. This theory is useful for rough mill
sizing.
3. The work index is useful for comparing
efficiency of milling operations
30. Summary
Rittinger’s theory:- (n=2.0)
Energy α new surface area formed.
Bond’s theory:- (n=1.5)
Energy used in crack propagation α Crack length
produced.
Kick’s theory:- (n=1.0)
Energy α Ratio of change in size.
31. Energy utilization
One of the first important investigations into the distribution of
the energy fed into a crusher was carried out by OWENS who
concluded that energy was utilized as follows:
In producing elastic deformation of the particles before fracture
occurs.
In producing inelastic deformation which results in size reduction.
In causing elastic distortion of the equipment.
In friction between particles, and between particles and the
machine.
In noise, heat and vibration in the plant, and
In friction losses in the plant itself.
Owens estimated that only about 10 per cent of the total power is
usefully employed.