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Dust Control Handbook for Minerals Processing
Chapter 5: Specific Illustrations
For problems with accessibility in using figures and illustrations in this document,
please contact the Directorate of Technical Support and Emergency Management at (202) 6932300.
Wet:

Truck or Loader to Crusher 
Note 1: 
Dust suppression system should be activated only during dumping cycle. 
Note 2: 
Airborne dust capture system should also be activated during dumping cycle and may be
kept on beyond the dumping cycle until adequate control of dust is achieved. 

Dry:

Truck or Loader to Crusher 
Q_{E} = 
33.3 × 
( 
600 T

) 
G 



Q_{E} 
= Exhaust air volume, CFM 
T 
= Weight of material dumped, TPM, tons per minute 
G 
= Bulk density of material, pounds/Ft^{3} 


Note: The open area at the face of the enclosure should be kept
to a minimum. 

Wet:

Railroad Rotary Dump to Receiving Hopper 
Note 1: 
Dust suppression system should be activated only during dumping cycle. 
Note 2: 
Airborne dust capture system should be activated during dumping cycle and may be kept on beyond the dumping cycle
until adequate control of dust is achieved. 

Dry:

Railroad Rotary Dump to
Receiving Hopper 
Q_{E} = 
33.3 × 
( 
600 T

) 
G 



Q_{E} 
= Exhaust air volume, CFM 
T 
= Weight of material dumped, TPM, tons per minute 
G 
= Bulk density of material, pounds/Ft^{3} 

Wet:

Railroad Dump to Conveyor 
Dry:

Railroad Dump to Conveyor 


_____ 
Q_{E1} = 10 A_{U1 } 
√ 
R_{1}S_{1}^{2}
D 



_____ 
Q_{E2} = 10 A_{U2 } 
√ 
R_{2}S_{2}^{2}
D 


Q_{E1}, Q_{E2} 
= Exhaust air volume, CFM 
A_{U1}, A_{U2} 
= Enclosure open area at upstream, FT^{2} 
R_{1}, R_{2} 
= Rate of material flow, TPM 
S_{1}, S_{2} 
= Height of fall, FT 
D 
= Average material size, FT 
Note 1: Q_{E1} and Q_{E2} should be calculated by using appropriate values
of A_{U} , R, and S. 
Note 2: This equation should be applied where D is greater that 1/8 in. 

Wet:
Feeder to: 




Hammermill Crusher



Cone Crusher 
Impactor 
Dry:
Feeder to: 




Hammermill Crusher



Cone Crusher 
Impactor 


_____ 
Q_{E} = 10 × A_{U} × 
√ 
RS^{2}
D 



Q_{E} 
= Exhaust air volume, CFM 
A_{U} 
= Enclosure open area at upstream, FT^{2} 
R 
= Rate of material flow, TPH 
S 
= Height of fall, FT 
D 
= Average material size, FT 


Note: This equation should be applied where D is greater than 1/8 in. 

Wet:


Feeder to: 


Bucket Elevator



Belt Conveyor 
Storage Hopper 
Dry:


Feeder to: 


Bucket Elevator



Belt Conveyor 
Storage Hopper 



_____ 
Q_{E} = 10 × A_{U }× 
√ 
RS^{2}
D 



Q_{E} 
= Exhaust air volume, CFM 
A_{U} 
= Enclosure open area at upstream, FT^{2} 
R 
= Rate of material flow, TPH 
S 
= Height of fall, FT 
D 
= Average material size, FT 


Note: This equation should be applied where D is greater than 1/8 in. 

Wet:
Feeder to: Screen
or Mill 

*Not Recommended*
Dry:
Feeder to: 




Rotating Screen



Vibrating Screen 
Ball/Rod Mill 


_____ 
Q_{E} = 10 × A_{U }× 
√ 
RS^{2}
D 



Q_{E} 
= Exhaust air volume, CFM 
A_{U} 
= Enclosure open area at upstream, FT^{2} 
R 
= Rate of material flow, TPH 
S 
= Height of fall, FT 
D 
= Average material size, FT 


Note: This equation should be applied where D is greater than 1/8 in. 

Wet:
Conveyor to: 






Cone Crusher

Roll Crusher





Hammermill Crusher 
Impactor 
Note: Excessive moisture may cause crusher jamming. 
Dry:
Conveyor to: 






Cone Crusher

Roll Crusher





Hammermill Crusher 
Impactor 


_____ 
Q_{E} = 10 × A_{U }× 
√ 
RS^{2}
D 



Q_{E} 
= Exhaust air volume, CFM 
A_{U} 
= Enclosure open area at upstream, FT^{2} 
R 
= Rate of material flow, TPH 
S 
= Height of fall, FT 
D 
= Average material size, FT 


Note: This equation should be applied where D is greater than 1/8 in. 

Wet:
Conveyor to: 



Bucket Elevator



Belt Conveyor 
Storage Hopper 
Dry:
Conveyor to: 



Bucket Elevator



Belt Conveyor 
Storage Hopper 



_____ 
Q_{E} = 10 × A_{U }× 
√ 
RS^{2}
D 



Q_{E} 
= Exhaust air volume, CFM 
A_{U} 
= Enclosure open area at upstream, FT^{2} 
R 
= Rate of material flow, TPH 
S 
= Height of fall, FT 
D 
= Average material size, FT 


Note: This equation should be applied where D is greater than 1/8 in. 

Wet:
Conveyor to: Screen or Mill 

*Not Recommended*
Dry:
Conveyor to: 



Revolving Screen



Vibrating Screen 
Ball Mill 


_____ 
Q_{E} = 10 × A_{U }× 
√ 
RS^{2}
D 



Q_{E} 
= Exhaust air volume, CFM 
A_{U} 
= Enclosure open area at upstream, FT^{2} 
R 
= Rate of material flow, TPH 
S 
= Height of fall, FT 
D 
= Average material size, FT 


Note: This equation should be applied where D is greater than 1/8 in. 

Wet:
From: Jaw Crusher 
From: Roll Crusher 


From: Impactor 




To:
Belt Conveyor 
Note: Excessive moisture may cause crusher jamming. 
Dry:
From: Jaw Crusher 
From: Roll Crusher 


From: Impactor 




To:
Belt Conveyor 


_____ 
Q_{E} = 10 × A_{U }× 
√ 
RS^{2}
D 



Q_{E} 
= Exhaust air volume, CFM 
A_{U} 
= Enclosure open area at upstream, FT^{2} 
R 
= Rate of material flow, TPH 
S 
= Height of fall, FT 
D 
= Average material size, FT 


Note: This equation should be applied where D is greater than 1/8 in. 

Wet:
From: Cone Crusher 
From: Hammermill Crusher 


From: Gyratory Crusher 




To:
Belt Conveyor 
Note: Excessive moisture may cause crusher jamming. 
Dry:
From: Cone Crusher 
From: Hammermill Crusher 


From: Gyratory Crusher 




To:
Belt Conveyor 


_____ 
Q_{E} = 10 × A_{U }× 
√ 
RS^{2}
D 



Q_{E} 
= Exhaust air volume, CFM 
A_{U} 
= Enclosure open area at upstream, FT^{2} 
R 
= Rate of material flow, TPH 
S 
= Height of fall, FT 
D 
= Average material size, FT 


Note: This equation should be applied where D is greater than 1/8 in. 

Wet:
Screen to: 




Crushers

Impactors




Conveyors 


Note: Excessive moisture may cause crusher jamming. 
Dry:
Screen to: 






Crushers

Impactors




Conveyors 




_____ 
Q_{E} = 10 × A_{U }× 
√ 
RS^{2}
D 



Q_{E} 
= Exhaust air volume, CFM 
A_{U} 
= Enclosure open area at upstream, FT^{2} 
R 
= Rate of material flow, TPH 
S 
= Height of fall, FT 
D 
= Average material size, FT 


Note: This equation should be applied where D is greater than 1/8 in. 
Note: "A_{U}" depends upon tightness of enclosure at
the screen. 

Wet:
Screen to: 



Elevators



Conveyors 
Hoppers 
Note: Excessive moisture may cause crusher jamming. 
Dry:
Screen to: 



Elevators



Conveyors 
Hoppers 



_____ 
Q_{E} = 10 × A_{U }× 
√ 
RS^{2}
D 



Q_{E} 
= Exhaust air volume, CFM 
A_{U} 
= Enclosure open area at upstream, FT^{2} 
R 
= Rate of material flow, TPH 
S 
= Height of fall, FT 
D 
= Average material size, FT 


Note: This equation should be applied where D is greater than 1/8 in. 
Note: "A_{U}" depends upon tightness of enclosure at
the screen. 

Wet:
Screen to: 




Conveyors




Hoppers 
Dry:
Screen to: 




Conveyors




Hoppers 



_____ 
Q_{E} = 10 × A_{U }× 
√ 
RS^{2}
D 



Q_{E} 
= Exhaust air volume, CFM 
A_{U} 
= Enclosure open area at upstream, FT^{2} 
R 
= Rate of material flow, TPH 
S 
= Height of fall, FT 
D 
= Average material size, FT 


Note: This equation should be applied where D is greater than 1/8 in. 
Note: "A_{U}" depends upon tightness of enclosure at
the screen. 

Wet:
Ball/Rod Mill to:
Feeder or Screen 

*Not Recommended*
Dry:
Ball/Rod Mill to: 




Vibrating Feeder




Vibrating Screen 
Q_{E} = 
200 CFM per square foot of open area 
Note: 
Avoid excessive air velocities at the face of the hood to prevent reentrainment of finely
ground material. 

Wet:
Ball/Rod Mill to: 



Bucket Elevator



Belt Conveyor 
Storage Bin Hopper 
Note: Moisture my cause sticking of Material in chutes. 
Dry:
Ball/Rod Mill to: 




Bucket Elevator



Belt Conveyor 
Storage Bin Hopper 



_____ 
Q_{E} = 10 × A_{U }× 
√ 
RS^{2}
D 



Q_{E} 
= Exhaust air volume, CFM 
A_{U} 
= Enclosure open area at upstream, FT^{2} 
R 
= Rate of material flow, TPH 
S 
= Height of fall, FT 
D 
= Average material size, FT 


Note: Avoid excessive air velocities at the face of the hood to prevent reentrainment of finely ground material. 

Wet:
Elevator to: 




Belt Conveyor 
Note: Wet systems are not recommended for fine powdery material. 
Elevator to: Screens *Not Recommended*
Dry:
Elevator to: 




Belt Conveyor



Revolving Screen 
Vibrating Screen 


_____ 
Q_{E} = 10 × A_{U }× 
√ 
RS^{2}
D 



Q_{E} 
= Exhaust air volume, CFM 
A_{U} 
= Enclosure open area at upstream, FT^{2} 
R 
= Rate of material flow, TPH 
S 
= Height of fall, FT 
D 
= Average material size, FT 


Note: This equation should be applied where D is greater than 1/8 in. 

Wet:
Elevator to: 






Screw Conveyor 
Storage Bin/Hopper 
Note: Wet systems are not recommended for fine powdery material. 
Dry:
Elevator to: 






Screw Conveyor 
Storage Bin/Hopper 



_____ 
Q_{E} = 10 × A_{U }× 
√ 
RS^{2}
D 



Q_{E} 
= Exhaust air volume, CFM 
A_{U} 
= Enclosure open area at upstream, FT^{2} 
R 
= Rate of material flow, TPH 
S 
= Height of fall, FT 
D 
= Average material size, FT 


Note: This equation should be applied where D is greater than 1/8 in. 

Wet:
Hopper to: 




Vibrating Feeder



Belt Conveyor 
Bucket Elevator 
Dry:
Hopper to: 




Vibrating Feeder



Belt Conveyor 

Bucket Elevator 



_____ 
Q_{E} = 10 × A_{U }× 
√ 
RS^{2}
D 



Q_{E} 
= Exhaust air volume, CFM 
A_{U} 
= Enclosure open area at upstream, FT^{2} 
R 
= Rate of material flow, TPH 
S 
= Height of fall, FT 
D 
= Average material size, FT 


Note: This equation should be applied where D is greater than 1/8 in. 

