Mechanical coal processing–

operations of screening and

crumbling.

Wykonała :
Magdalena

Młynarczyk

Processing of minerals

- one of basic branches of the

technology and techniques of the
mining.

- maximum increasing the content of

the useful element.

Mechanical coal

processing

Physical methods of concentrate

Drying, blending

Classification grains+ crumbling

Classification grains

Separation of a mixture of grains according to their

size called screening (support operation) or
sorting (operation main).

Types of screens :

- Sifter made of the wire or the fabric ,
- sifter with square hole (rare rectangular) or round.

Kind of shifter:

Parameters getting in for the

process of sieving:

- the frequency and the vibration

amplitude,

- pitch of the sieve to the level,
- amount of material on the sieve,
- shape of the grain.

Sifter

Pulerize

•  to press or crush something

until it becomes powder or a soft
mass:

Processes of pulerize:

Crushing - slow increase in power
binding to the grain of the put
baulk with two plates from which
one is motionless

Splitting- exerting
compressive force along a
specified grain lines

Tearing - functioning of two
forces about opposite
returns

Hitting- the efect of rapid
action force crushing on the
loose grain

Wiping off - acting on the
surface of friction forces of
joint of the grain with two
plates moving eatch otcher

Bending - action of
moments bending in the
grain put between two
plates about different
forming

Cutting-
force two opposing phrases 
that 
move relative to each other 
two 
loved ones apart sections of
 grain

The choice of method depen

ds on the shredding:

- hardness
- the resistance to stretching, bending

and hitting,

- springiness,
- brittleness,
- humidity,
- size of grains

Jaw crusher

Conical crusher

Hammer crusher

Thanks for attention ;)