The document discusses different types of grinders used for size reduction. It begins with an introduction to grinders, explaining that they are machines that reduce the size of crushed materials through grinding. It then describes the main types of grinders as fine grinders and ultrafine grinders. The document provides examples of specific grinders like ball mills, hammer mills, and fluid energy mills. It concludes by discussing applications of grinders in industries and laboratories for producing powdered materials.

1. GRINDERS
Presented by : Mohit Kumar Rayatasingh
Branch : Chemical Engg.(2nd Year)
Roll No. : 1613351013
22-Jul-19

2. LIST OF CONTENTS :
 Introduction to the Grinders.
 Types of Grinders.
 What are GRINDERS??
 List of Grinders.
 Applications.
 Uses
 References
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3. INTRODUCTION TO GRINDERS
 A grinding machine, often shortened to grinder.
 Grinder is an size reduction equipment.
 Grinders are the machine which reduces crushed feed into powder.
 It yields a product that might passes the 40 mesh screen.
 A fine grinder yield a product most of which would pass a 200
mesh screen.
 Basic types of grinders are:- (i) Fine grinders (ii)Ultrafine grinders
 The factors to be selected for size reduction are:- hardness,
stickness, moisture, specific gravity and mechanical structure.
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4. TYPES OF GRINDERS
SIZE REDUCTION EQUIPMENTS
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Fine Grinders
(Intermediate and fine)
Ultrafine Grinders
( very fine )
(a) Hammer mills, Impacters (a) Hammer mills with internal
clarification
(b) Rolling compression mills
i. Ball mills
ii. Rolling mills
(b) Fluid energy mills
(c) Attrition mills (c) Agitated mills
(d) Revolving mills
i. Rod mills
ii. Ball mills, Pebble mills
iii. Tube mills

5. WHATARE GRINDERS??
 Grinders are the equipment used to reduce the size of the particles.
 They make coarse size particles into powder form.
 A grinder take the product of crusher as the feed(i.e. coarse
particle as feed).
 Grinders are very useful for making the powdery materials.
 There are many types of grinders but the two basic types are :-
(i) fine grinders (ii) ultrafine grinders
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6. DIFFERENTTYPES OF GRINDERS
1.Ball mill 2. Hammer mill
3. Tube mill 4. Rolling mill
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7. 5. Agitated mills 6. Attrition mills
7. Fluid energy mills
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8. APPLICATIONS
 Used in industries for size reduction.
 Used in both scale of laboratories(small and large).
 In domestic products also.
 Used in day to day purposes.
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9. USES
 Used to make powdery materials for studying well.
 Grinders are used in industries.
 They are also used in domestic purposes.
 Also used to grind the eatables.
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10. REFERENCES
 https://www.quora.com/search?q=grinders
 https://www.scribd.com/document/345692457/Unit-
Operations-of-Chemical-Engineering-McCabe-and-Smith
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