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Produce Materials with High Uniform Fineness
 The Raymond® Mechanical Air Separator produces material with high uniform fineness; operates in open or closed circuit; is excellent for de-dusting; can provide drying and cooling; and features the unique single or double whizzer for faster separation of fines and more positive rejection of oversize.
Operation Cycle
Material enters the hollow shaft or center feed pipe at the top of the separator and drops upon the rotating distributor plate below. This distributor plate disperses the material into the upward sweep of circulating air developed by the fan in the top chamber of the drum. The whizzer blades set up a centrifugal motion of the air and material. This concentrates the oversize material along the surface of the upper inner cone, where gravity causes it to flow into the lower inner cone and then out the coarse spout at the bottom. The airstream carrying the powdered material of required fineness moves through the fan and is delivered into the outer cone chamber where the fines are discharged as finished product. After the fines are released in the outer cone, the air returns through the deflector ports to the inner cone, setting up a continuous circuit.
In addition to accomplishing faster separation of the fines and more positive rejection of the oversize, the whizzer action is also useful in de-dusting operations-making granular products by removing objectionable fines, for example-as well as producing microsize materials with maximum surface area.
Single Whizzer Air Separators
Single whizzer separators have only one bank of whizzer blades to set up centrifugal action. This unit is ordinarily used for coarser separations up to approximately 10-15% R74 microns (85 to 90% passing 200 mesh) which is excellent for de-dusting and raw mix cement operations.
Double Whizzer Air Separators
Double whizzer units have two rows or banks of whizzer blades. In normal operations they can produce finished materials up to 0.5-1% R44 microns (99 to 99.5% passing 325 mesh) and in finished cement circuits 2800 to 6000 Blaine or masonary cements.
Applications
Closed Circuit Grinding
When operated in closed circuit combination with a pulverizer, the separator skims off the fines as fast as they are made so the mill works only on fresh material without wasting power. The tailings are discharged back to the mill for further reduction. The reground material is returned to the separator with the feed, so that a constant circulating load is set up between the mill and the separator.
The separator may be used in combination with ball mills, tube mills and compartment mills. Its function is to maintain a constant fineness in deliveringthefinished product.
Open Circuit
In some cases, it is convenient to install the separator independently from the mill to make both a fine and coarse product simultaneously.
Double Whizzer Separator
|
Size |
Approximate Weight |
Height - H |
Height - h |
Diameter - D |
|
|
lb |
kg |
ft |
mm |
ft |
mm |
ft |
mm |
|
30" |
950 |
400 |
5.2 |
1,500 |
1.5 |
400 |
3.2 |
900 |
|
4' |
2,000 |
900 |
8.0 |
2,400 |
4.3 |
1,200 |
5.0 |
1,500 |
|
6' |
4,000 |
1,800 |
11.0 |
3,300 |
5.8 |
1,700 |
7.1 |
2,100 |
|
8' |
8,000 |
3,600 |
14.3 |
4,300 |
7.7 |
2,300 |
9.7 |
2,900 |
|
10' |
11,500 |
5,200 |
16.8 |
5,100 |
8.5 |
2,500 |
11.7 |
3,500 |
|
12' |
22,500 |
10,200 |
19.7 |
5,900 |
9.7 |
2,900 |
14.2 |
4,300 |
|
14' |
28,500 |
12,900 |
22.1 |
6,700 |
10.3 |
3,100 |
16.0 |
4,800 |
|
16' |
3,300 |
17,800 |
25.5 |
7,700 |
12.1 |
3,600 |
17.8 |
5,400 |
|
18' |
44,800 |
20,300 |
27.1 |
8,200 |
11.9 |
3,600 |
20.8 |
6,300 |
|
21' |
69,400 |
31,400 |
29.3 |
8,900 |
14.9 |
4,500 |
24.0 |
7,300 |
|
24' |
90,000 |
40,800 |
37.3 |
11,300 |
17.2 |
5,200 |
27.0 |
,8200 |
 
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