(No "Download lock")........... Study it, Download it, Understand it, Apply it and Serve the community.
رَبِّ زدْنيِ عِلْماً (Arabic)..............Ameen.
The first lecture in the module Particle Technology, delivered to second year students who have already studied basic fluid mechanics. Some applications of Particle Technology are described, in industry and nature, and particle size analysis and means of representing the data. The format for the laboratory classes for the module and their reports are covered.
Different type of screening equipment and their application in chemical industryDesaiHardik1
Different type of screening equipment and their application in chemical industry. Screening equipment consists of a drive that induces vibration, a screen media that causes particle separation, and a deck that holds the screen media and the drive and is the mode of transport for the vibration. It is used during the mechanical screening processes, designed to separate one material from another. As the second part of the material handling process, screening equipment is used to separate raw material from a crusher or quarry into even finer grades, coming closer to an end product. There are two types of screens [wet and dry], totally dependent on the raw material. Wet screens utilize spray nozzles and water along with screen vibration in the sorting process, while dry screens use vibration only.
Size reduction is a process of reducing large solid unit masses into small unit masses, coarse particles or fine particles.
Size reduction process is also termed as
Comminution/Diminution/Pulverizations.
Solid pieces of food is reduced by the
application of grinding, compression
or impact forces.
In many food processes it is frequently
necessary to reduce the size of solid
materials for different purposes
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
Basics of Ideal and actual screen
Types of screen analysis
Cumulative analysis
Differential analysis
Capacity and effectiveness of screen
Derivation of formula for overall effectiveness of screen
Faults in screening
Types of screen:
Trommel,
Grizzlies,
Vibrating screen
Mechanical Operations
spray drying is technology widely used in milk powder and coffee powder manufacturing industry because of its working principle and technology involved..
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.
The first lecture in the module Particle Technology, delivered to second year students who have already studied basic fluid mechanics. Some applications of Particle Technology are described, in industry and nature, and particle size analysis and means of representing the data. The format for the laboratory classes for the module and their reports are covered.
Different type of screening equipment and their application in chemical industryDesaiHardik1
Different type of screening equipment and their application in chemical industry. Screening equipment consists of a drive that induces vibration, a screen media that causes particle separation, and a deck that holds the screen media and the drive and is the mode of transport for the vibration. It is used during the mechanical screening processes, designed to separate one material from another. As the second part of the material handling process, screening equipment is used to separate raw material from a crusher or quarry into even finer grades, coming closer to an end product. There are two types of screens [wet and dry], totally dependent on the raw material. Wet screens utilize spray nozzles and water along with screen vibration in the sorting process, while dry screens use vibration only.
Size reduction is a process of reducing large solid unit masses into small unit masses, coarse particles or fine particles.
Size reduction process is also termed as
Comminution/Diminution/Pulverizations.
Solid pieces of food is reduced by the
application of grinding, compression
or impact forces.
In many food processes it is frequently
necessary to reduce the size of solid
materials for different purposes
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
Basics of Ideal and actual screen
Types of screen analysis
Cumulative analysis
Differential analysis
Capacity and effectiveness of screen
Derivation of formula for overall effectiveness of screen
Faults in screening
Types of screen:
Trommel,
Grizzlies,
Vibrating screen
Mechanical Operations
spray drying is technology widely used in milk powder and coffee powder manufacturing industry because of its working principle and technology involved..
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.
Crushing of coal and calculation of size reduction efficiency.Utsav Kant
Mineral/Coal Processing is the subsequent step after mining of Mineral/Coal. The first step of Mineral Processing is the Crushing of minerals. This presentation is about crushing of coal and how to calculate the crushing efficiency of coal from processing point of view.
Crushing efficiency has been defined in the literature from the power consumption point of view. But while operating a process plant, it is more important that the crushing efficiency is defined in terms of the requirement of subsequent process. The Process plant has been designed for coal size - 13 mm ( 80 % passing). The 610 mm dia cyclones are inefficient at sizes less than 3 mm. Hence a study has been made from the plant data to arrive at the crushing efficiency of crushers.
Mineral Processing
Jaw crusher
gyratory Crusher
beneficiaton
roll crusher
screening separation classifier
grinding crushing law dry grinding wet grinding Ned university My-203
The basic principles of particle size reduction. Presentation includes a comparison of gravity and pneumatic discharge hammer mills, how finished particle size is determined, and an explanation of particle size distribution.
To Improve the Calorific Value of Cotton Waste by Anaerobic Digestionijsrd.com
Ginning industries, spinning mills and other composite textiles industries produce a lot of cotton waste annually. This waste is rich in cellulose and solid contents with sufficient carbon to nitrogen ratios. However a lot of chemicals are already present in cotton waste at the end of various processes like dyeing, finishing, washing, etc. This reduces the fuel value of cotton by lowering down its calorific value. The calorific value (or energy value or heating value) of a substance, usually a fuel or food (see food energy), is the amount of heat released during the combustion of a specified amount of it. Improving the calorific value of cotton by anaerobic digestion is an environment friendly approach of converting waste to energy.
Particle size reduction and its impact in the food industryquadrocomil
Quadrocomil leading technology provider of security screening equipment, size reduction equipment for unparalleled results in particle size reduction. For more info, visit our website.
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.
SIZE REDUCTION AND FACTORS AFFECTING SIZE REDUCTION IN PHARMACEUTICAL INDUSTRYAkankshaPatel55
In the realm of pharmacy, size truly matters! Particle size reduction, often referred to as comminution, plays a crucial role in transforming raw materials into effective and readily absorbable medications. It's like shrinking giants - turning bulky substances into microscopic warriors ready to combat ailments.
Why is size reduction so important? Imagine trying to swallow a whole apple compared to taking a bite. The smaller the pieces, the greater the surface area exposed, and the faster and more efficiently something dissolves or reacts. In the world of medicine, this translates to:
Enhanced drug bioavailability: Smaller particles dissolve quicker and more readily in the digestive system, leading to faster absorption and action of the medication. Think of it as opening wider doors for the drug to enter the bloodstream and reach its target.
Improved drug stability: Smaller particles tend to be more stable and less prone to degradation, ensuring the medication's potency and effectiveness over time.
Uniformity and mixing: Precise size control allows for consistent drug distribution within a dosage form, guaranteeing accurate and reliable dosing.
Tailored drug delivery: Size reduction facilitates the development of specialized drug delivery systems, like inhalers or sublingual tablets, where minute particles are crucial for targeted action.
How is size reduction achieved? A variety of techniques are employed, each with its own advantages and best suited for specific materials:
Milling: Mechanical grinding using ball mills, hammer mills, or jet mills physically breaks down larger particles into smaller ones.
Micronization: Specialized techniques like air jet milling or fluidized bed milling achieve ultra-fine particle sizes in the micron range (1-10 micrometers).
Cryo-milling: Grinding at cryogenic temperatures minimizes heat generation, preserving sensitive drug compounds.
Size reduction isn't just about brute force. Choosing the right technique and particle size depends on various factors, including the drug's physical and chemical properties, desired release profile, and dosage form. It's a delicate dance between effectiveness, stability, and manufacturability.
The impact of size reduction extends far beyond individual medications. It enables the development of innovative drug delivery systems, like controlled-release tablets or transdermal patches, that improve patient compliance and treatment outcomes. It also plays a vital role in research and development, allowing scientists to study drug interactions and optimize formulations at the microscopic level.
So, the next time you pop a pill, remember the invisible giants behind it - the power of size reduction silently working its magic to deliver healing and hope.
(No "Download lock")........... Study it, Download it, Understand it, Apply it and Serve the community.
رَبِّ زدْنيِ عِلْماً (Arabic)..............Ameen.
Immunizing Image Classifiers Against Localized Adversary Attacksgerogepatton
This paper addresses the vulnerability of deep learning models, particularly convolutional neural networks
(CNN)s, to adversarial attacks and presents a proactive training technique designed to counter them. We
introduce a novel volumization algorithm, which transforms 2D images into 3D volumetric representations.
When combined with 3D convolution and deep curriculum learning optimization (CLO), itsignificantly improves
the immunity of models against localized universal attacks by up to 40%. We evaluate our proposed approach
using contemporary CNN architectures and the modified Canadian Institute for Advanced Research (CIFAR-10
and CIFAR-100) and ImageNet Large Scale Visual Recognition Challenge (ILSVRC12) datasets, showcasing
accuracy improvements over previous techniques. The results indicate that the combination of the volumetric
input and curriculum learning holds significant promise for mitigating adversarial attacks without necessitating
adversary training.
Explore the innovative world of trenchless pipe repair with our comprehensive guide, "The Benefits and Techniques of Trenchless Pipe Repair." This document delves into the modern methods of repairing underground pipes without the need for extensive excavation, highlighting the numerous advantages and the latest techniques used in the industry.
Learn about the cost savings, reduced environmental impact, and minimal disruption associated with trenchless technology. Discover detailed explanations of popular techniques such as pipe bursting, cured-in-place pipe (CIPP) lining, and directional drilling. Understand how these methods can be applied to various types of infrastructure, from residential plumbing to large-scale municipal systems.
Ideal for homeowners, contractors, engineers, and anyone interested in modern plumbing solutions, this guide provides valuable insights into why trenchless pipe repair is becoming the preferred choice for pipe rehabilitation. Stay informed about the latest advancements and best practices in the field.
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.
Student information management system project report ii.pdfKamal Acharya
Our project explains about the student management. This project mainly explains the various actions related to student details. This project shows some ease in adding, editing and deleting the student details. It also provides a less time consuming process for viewing, adding, editing and deleting the marks of the students.
Saudi Arabia stands as a titan in the global energy landscape, renowned for its abundant oil and gas resources. It's the largest exporter of petroleum and holds some of the world's most significant reserves. Let's delve into the top 10 oil and gas projects shaping Saudi Arabia's energy future in 2024.
Welcome to WIPAC Monthly the magazine brought to you by the LinkedIn Group Water Industry Process Automation & Control.
In this month's edition, along with this month's industry news to celebrate the 13 years since the group was created we have articles including
A case study of the used of Advanced Process Control at the Wastewater Treatment works at Lleida in Spain
A look back on an article on smart wastewater networks in order to see how the industry has measured up in the interim around the adoption of Digital Transformation in the Water Industry.
Hybrid optimization of pumped hydro system and solar- Engr. Abdul-Azeez.pdffxintegritypublishin
Advancements in technology unveil a myriad of electrical and electronic breakthroughs geared towards efficiently harnessing limited resources to meet human energy demands. The optimization of hybrid solar PV panels and pumped hydro energy supply systems plays a pivotal role in utilizing natural resources effectively. This initiative not only benefits humanity but also fosters environmental sustainability. The study investigated the design optimization of these hybrid systems, focusing on understanding solar radiation patterns, identifying geographical influences on solar radiation, formulating a mathematical model for system optimization, and determining the optimal configuration of PV panels and pumped hydro storage. Through a comparative analysis approach and eight weeks of data collection, the study addressed key research questions related to solar radiation patterns and optimal system design. The findings highlighted regions with heightened solar radiation levels, showcasing substantial potential for power generation and emphasizing the system's efficiency. Optimizing system design significantly boosted power generation, promoted renewable energy utilization, and enhanced energy storage capacity. The study underscored the benefits of optimizing hybrid solar PV panels and pumped hydro energy supply systems for sustainable energy usage. Optimizing the design of solar PV panels and pumped hydro energy supply systems as examined across diverse climatic conditions in a developing country, not only enhances power generation but also improves the integration of renewable energy sources and boosts energy storage capacities, particularly beneficial for less economically prosperous regions. Additionally, the study provides valuable insights for advancing energy research in economically viable areas. Recommendations included conducting site-specific assessments, utilizing advanced modeling tools, implementing regular maintenance protocols, and enhancing communication among system components.
2. Introduction
• 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.
3. 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).
4. Energy for size reduction
• The energy dE required to effect a small change dL in the size of
unit mass of material is a simple power function of the size.
• Rittinger’s law:
– putting p = −2, then integration gives:
– Writing C = KRfc, where fc is the crushing strength of the material, then
Rittinger’s law, first postulated in 1867, is obtained as:
– Since the surface of unit mass of material is proportional to 1/L, the
interpretation of this law is that the energy required for size reduction
is directly proportional to the increase in surface.
5. • 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 Law:
– Neither of these two laws permits an accurate calculation of the energy
requirements.
– Rittinger’s law is applicable mainly to that part of the process where
new surface is being created and holds most accurately for fine grinding
where the increase in surface per unit mass of material is large.
– Kick’s law, more closely relates to the energy required to effect elastic
deformation before fracture occurs, and is more accurate than
Rittinger’s law for coarse crushing where the amount of surface
produced is considerably less.
6. • 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 a size L2 of 100 μm, that is q =∞.
10. 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.
11. Method of operating crusher
• There are two distinct methods of feeding material to a
crusher:
– Free crushing; involves feeding the material at a
comparatively low rate so that the product can readily
escape. Its residence time in the machine is therefore
short and the production of appreciable quantities of
undersize material is avoided.
– Choke feeding; In this case, the machine is kept full of
material and discharge of the product is impeded so that
the material remains in the crusher for a longer period.
This results in a higher degree of crushing, although the
capacity of the machine is reduced and energy
consumption is high.
12. Mode of operation
• Open circuit grinding:
If the plant is operated, as in choke feeding, so that the
material is passed only once through the equipment,
the process is known as open circuit grinding.
• Closed circuit grinding:
If the product contains material which is insufficiently
crushed, it may be necessary to separate the product
and return the oversize material for a second crushing
This system which is generally to be preferred, is
known as closed circuit grinding
13. Separation may be done by:
•allowing the material to fall on to a screen
•or subjecting it to the action of a stream of fluid.
14. Classification of crushers
• it is not generally economical to effect a large reduction ratio in a
single machine.
• The equipment used is usually divided into classes as given below,
according to the size of the feed and the product.
• A greater size reduction ratio can be obtained in fine crushers than
in coarse crushers
15. Types of grinding
• Grinding may be carried out either wet or dry.
• wet grinding is generally applicable only with low speed
mills.
• The advantages of wet grinding are:
– The power consumption is reduced by about 20–30 per cent.
– The capacity of the plant is increased.
– The removal of the product is facilitated and the amount of
fines is reduced.
– Dust formation is eliminated.
– The solids are more easily handled.
• Disadvantages are:
– The wear on the grinding medium is generally about 20 per cent
greater.
– It may be necessary to dry the product.
16. Nature of the material to be crushed
• Hardness:
The hardness of the material affects the power consumption and the wear
on the machine. With hard and abrasive materials it is necessary to use a
low-speed machine and to protect the bearings from the abrasive dusts
that are produced.
• Structure:
Normal granular materials such as coal, ores and rocks can be effectively
crushed employing the normal forces of compression, impact, and so on.
With fibrous materials a tearing action is required.
• 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.
17. • Crushing strength:
The power required for crushing is almost directly proportional to the
crushing strength of the material.
• 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.
20. • Feed is admitted between two jaws set to form V open at the top.
• One jaw is fixed and is nearly vertical and does not move.
• While the other jaw is moveable and reciprocates in a horizontal
plane making an angle 20 – 30 degree with the fixed jaw.
• The jaws faces are flat or they may contain grooves. Jaw widths
varying from about 150 mm to 1.0 m with crushing faces formed of
manganese steel
• Large lumps caught between the upper part of the jaws are broken,
dropped into the narrow space below and are further crushed.
• After sufficient reduction they dropped off the machine.
• The jaws open and close 250 – 400 times per minutes depending
upon the speed.
• The most common type of jaw crusher is Blake jaw crusher / Stage
jaw crusher in which the moveable jaw is pivoted at the top so that
the maximum movement is at the bottom of the V due to which
there is a little tendency for this crusher to choke. Therefore it is
widely used in industries for crushing of hard rock for example in
cement and ceramic industries.
• In Dodge jaw crusher the moving jaw is pivoted at the bottom
because of which minimum movement is at the bottom as a
consequence more uniform product is obtained. It is not widely
used because of its tendency to chock.
23. • The ball mill consists of a rotating hollow cylinder, partially filled
Construction
with balls, with its axis either horizontal or at a small angle to the
horizontal. In large ball mill the shell might be 3 m in diameter and
4.25 m in length.
• The outlet is normally covered with a coarse screen to prevent the
escape of the balls.
• The inner surface of the cylinder is usually lined with an abrasion-resistant
material such as manganese steel, stonewear or rubber.
Less wear takes place in rubber-lined mills and the coefficient of
friction between the balls and the cylinder is greater than with steel
or stoneware linings. The balls are therefore carried further in
contact with the cylinder and thus drop on to the feed from a greater
height. In some cases, lifter bars are fitted to the inside of the
cylinder. Another type of ball mill is used to an increasing extent,
where the mill is vibrated instead of being rotated, and the rate of
passage of material is controlled by the slope of the mill.
• Grinding medium are the metalic balls are usually made of iron,
manganes or steel and occupy between 30 and 50 per cent of the
volume of the mill. The diameter of ball used will vary between 12
mm and 125 mm
24. Working
• The ball mill is used for the grinding of a wide range of materials
and it copes with feed up to about 50 mm in size.
• The material to be ground may be fed in through a 60 degree cone
at one end and the product leaves through a 30 degree cone at the
other end.
• The efficiency of grinding increases with the hold-up in the mill,
until the voids between the balls are filled. Further increase in the
quantity then lowers the efficiency.
• Large balls deal effectively with the feed and the small ones are
responsible for giving a fine product.
• During grinding, the balls wear and are constantly replaced by new
ones so that the mill contains balls of various ages, and hence of
various sizes.
• As the shell rotates the large balls moves towards the point of
maximum diameter and small balls migrated towards the discharge.
• As the mill rotate the balls are picked up by the wall and carried
upward depending upon the speed where they loose contact and
falls to the bottom.
• In ball mill most of the reduction is done by impact as the balls are
dropped from the top of mill and remaining is done by compression
and attrition as the ball slides over each other and over the wall of
shell.
25. Factors influencing the size of the product
The rate of feed: With high rates of feed, less size reduction is effected since the material is
in the mill for a shorter time.
The properties of the feed material: The larger the feed the larger is the product under
given operating conditions. A smaller size reduction is obtained with a hard material.
Weight of balls: A heavy charge of balls produces a fine product. The weight of the charge
can be increased, either by increasing the number of balls, or by using a material of higher
density. Since optimum grinding conditions are usually obtained when the bulk volume of
the balls is equal to 50 per cent of the volume of the mill.
The diameter of the balls: Small balls facilitate the production of fine material although
they do not deal so effectively with the larger particles in the feed. For most economical
operation, the smallest possible balls should be used.
The slope of the mill: An increase in the slope of the mill increases the capacity of the
plant because the retention time is reduced, although a coarser product is obtained.
Discharge freedom: Increasing the freedom of discharge of the product has the same
effect as increasing the slope. In some mills, the product is discharged through openings in
the lining.
• The speed of rotation of mill: At low speeds of rotation, the balls simply roll over one
another and little crushing obtained. At slightly higher speeds the balls are projected
short distances across the mill, and at still higher speeds they are thrown greater distances
and considerable wear of the lining of the mill takes place. At very high speeds, the balls
are carried right round in contact with the sides of the mill and little relative movement or
grinding takes place again. The minimum speed at which the balls are carried round in this
manner is called the critical speed at which no grinding take place.
26. Critical speed of ball mill
Ball mill operates at 50 to 75 percent
of critical speed.
Ball mill operating at correct speed
28. • The mill may be used wet or dry although wet grinding
Advantages
facilitates the removal of the product.
• The costs of installation and power are low as compared to
other mils.
• The ball mill may be used with an inert atmosphere and
therefore can be used for the grinding of explosive materials.
• The grinding medium is cheap.
• The mill is suitable for materials of all degrees of hardness.
• It may be used for batch or continuous operation.
• It may be used for open or closed circuit grinding. With open
circuit grinding, a wide range of particle sizes is obtained in
the product. With closed circuit grinding, the use of an
external separator can be obviated by continuous removal of
the product by means of a current of air or through a screen
29. Few problems
• A certain crusher accepts a feed of rock having diameter of
0.75 in and discharge a product of diameter 0.2 in. the
power required to crush 12 tons per hr is 9.3 hp. What
should be the power required if the capacity is reduced to
10 ton per hr and as a consequence of which the diameter
of product become 0.15 in?
• What is the power required to crush 100 tons/hr of lime
stone if 80% of the feed passes through a 2 in screen and
80% of the product through 1/8 in screen (Ei = 12.74 kW hr
mm/tons)?
• It is required to crush 250 tons/hr of an ore which may be
classified as a soft material . The range of feed size is such
that 80% passes through an opening of 16 in. The product
size is to be such that 80% passes through an opening of 3
in. Estimate the power consumption per ton of feed (Ei =
13.1 kW hr mm/ton)?
• What will be the product size of the material having
reduction ratio of 10? If the energy required to crush 2 tons
of material is 100 kW hr. Assume Ei = 10 kW hr mm /ton).
30. • A crusher is reducing lime stone of crushing 70
MN/m2 from 6mm diameter average size to
0.1 mm average size. Energy required is 9
kW/(tons/hr). The same machine is used to
crush dolomite at the same rate from 6mm
diameter of average size to the product which
consist of 20% with an average diameter of
0.25 mm, 60% with an average diameter of
0.125 mm and the balance with an average
diameter of 0.085 mm. Estimate the power
required to drive a crusher. The crushing
strength of dolomite is 100 MN/m2.