Its about jaw crasher at laboratory level.

2. Experiment No. 1:
Jaw Crusher
Dr. Muhammad Shahzad
Assistant Professor
Department of Mining Engineering
University of Engineering and Technology,
Lahore.

3. Presentation Scheme
Objectives
Specifications of Laboratory Jaw Crusher
Observations and Calculations
Related Theory
 Introduction
 Types
 Construction and Working
 Performance Indicators
 Parameters affecting performance
 Applications and limitations

4. Objectives
The main objectives of this experiment are:
 to study the various parts of Laboratory Jaw Crusher with
special emphasis on their functions,
 to perform a crushing test on a given sample,
 to analyze the product by sieve analysis and
 to calculate its reduction ratio by feed size and product
size measurement, and its capacity and energy
consumption by using mathematical expressions.

5. Specifications of Laboratory Jaw Crusher
Name Denver Blake Jaw Crusher
Motor 5hp
Motor RPM 1440
Crusher RPM 325 – 375
Face Of Flywheel 3 ¼ “
Movable Jaw Depth 14”
Fix Jaw Depth 12”
Width Of Jaw Plate 6”
Crusher Designed Capacity 600 lbs/hr
Flywheel Diameter 18”
Max: Feed Size (Gape) 5”×6”
Size Of Set close ½ʺ open 1 ¼ ʺ

6. Observations and Calculations
 Feed Size
 Product Size
Sr. No.
Sieve Aperture Size Individual Mass
Cumulative Mass
Percentage
Passing Retaining
Geometric
mean
Measured Percentage Passing Retaining
1
2
3
4
5
6
7
Sr. No. Length (mm) Width (mm) Height (mm)

7. Observations and Calculations
 Reduction Ratio
𝑅𝑒𝑑𝑢𝑐𝑡𝑖𝑜𝑛 𝑅𝑎𝑡𝑖𝑜80 =
80% 𝑃𝑎𝑠𝑠𝑖𝑛𝑔 𝐹𝑒𝑒𝑑 𝑆𝑖𝑧𝑒
80% 𝑃𝑎𝑠𝑠𝑖𝑛𝑔 𝑃𝑟𝑜𝑑𝑢𝑐𝑡 𝑆𝑖𝑧𝑒
 Capacity and Energy Consumption
 Graph
 Draw graph of cumulative passing and retaining mass percentage
against aperture size (geometric mean) and determine cut size,
d10, d25, d50, and d75.
 Draw log-normal plot between aperture size (passing) and
cumulative passing mass percentage and determine the standard
deviation.
 Express Gaudin-Schuhmann distribution on graph and
determine the constants involved.
 Express Rosin-Rammler distribution on graph and determine
the constants involved.
*Note: Read Topic 2.2. “Particle Size Distribution” in “Mineral Processing
Design and Operation” by A. Gupta and D. S. Yan

8. CRUSHERS
8

9. Introduction & Types of Crushing
9
 What is crushing?
 Main objectives of crushing
 To reduce the particle size for increasing surface area
 To liberate valuable minerals from gangue minerals
 To manage the size of feed for next operation
 To prepare feed for separation process
 Types of Crushing
 Primary Crushing
 Secondary Crushing
 Tertiary Crushing

10. Crushers
Gyratory Crusher Jaw Crusher
Primary Crushers

11. Crushers
Cone Crusher Roll Crusher
Secondary Crushers

12. Crushers
Primary & Secondary Crusher
Impact Crusher

13. General Crushing Circuit

14. Types of Crushing Circuits

15. PRIMARY CRUSHERS
15

16. Introduction to Jaw Crusher
16
 What is a Jaw Crusher?

17. Types of Jaw Crusher
 Main types
 Blake type
 Double toggle Blake type
 Single toggle Blake type
 Dodge type
 Universal type
17

18. Double toggle Blake type
18

19. 19

20. Single Toggle Blake Type
20

21. Comparison B/t Double Toggle & Single Toggle
 Parameters
 Type of motion
 Capacity
 Wear
 Maintenance cost
 Capital cost
 Nature of material
21

22. Free crushing & choked crushing
22

23. Jaw Crusher Construction
23
 Main Frame (in sections)
 Jaws & Liners
 Cheek Plates

24. Performance Indicators
24
 Capacity
 Energy requirements
 Reduction ratio

25. Parameters affecting performance
25
 Feed Characteristics
 Solid Density
 Design Parameters
 Angle between jaws
 Width and length of jaw plates
 Throw
 Shape of jaw plates
 Operating Parameters
 RPM
 Set

26. Characteristics of Jaw Crusher
26
 Angle b/w jaws
 Speed
 Throw
 Set
 Safety Spring
 Capacity
 Energy requirements
 Reduction ratio

27. Drawbacks of Jaw Crusher
27
 180 degree machine
 Not suitable for stick Material
 Lumps passes without crushing

28. 28

29. Thank You