Experiment #1
Jaw crusher
2019-CH-35
1.1) Abstract
The purpose of this experiment was to understand the working principle of the primary crusher.
Perform crushing by jaw crusher, a sieve analysis by ro-tap sieve shaker, and to resolve mixture
in several fractions which is, then, followed by statistical analysis of data, further calculate the
reduction ratio.
1.2) Apparatus
Laboratory Jaw crusher
Vernier caliper
Rock sample for crushing
Ro tap sieve shaker
Sieves set
Torsion Balance
1.3) Theory
1.3.1) Introduction
The first stage of size reduction of hard and large lumps of run-of-mine (ROM) ore is to crush
and reduce their size. Crushing is the first mechanical stage in the process of comminution in
which a principal objective is the liberation of the valuable minerals from the gangue. Other
purposes include; reducing the particle size for increasing surface area, managing the size of feed
for the next operation, and preparing feed for the separation process. The mechanism of crushing
is either by applying impact force, pressure or a combination of both
1.3.2) Types of crushing circuit
Crushing may be in open- or closed-circuit, depending on the required product size distribution
a) Open circuit
b) Close circuit
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