Coal - 6" Hydrocyclone Underflow Screening

• Fine Sizing Coal at 75 Microns (200 Mesh)

• Removal of -200 Mesh Fraction from 6-inch Hydrocyclone Underflow

• Ash and Moisture Content Reduction in Final Product

• Minimal Operator Involvement

 

With the success of the Stack Sizer reducing ash in clean coal spiral circuits, Derrick Corporation began evaluation of other applications for the coal industry. Full-scale tests with the Stack Sizer have proven the machine's capability for ash reduction from 6-inch hydrocyclone underflow.

 

A Stack Sizer fitted with Derrick 75 micron urethane screen panels can effectively reduce the ash content from 6-inch hydrocyclone underflow by over 40%. One five-deck Stack Sizer is capable of processing about 20 short tons per hour of feed slurry, having 15 percent solids by weight. The Stack Sizer reduced the ash content of the cyclone underflow from 37 percent in the feed to 8 percent in the oversize fraction.

 

Since January 2009, eight five-deck Stack Sizers have begun processing clean coal hydrocyclone underflow at several coal preparation plants in Illinois and Kentucky.

 

6" Hydrocyclone Underflow Flow Diagram

 

 

Stack Sizer Feed (100 Mesh X 325 Mesh)

 

 

Removal of -200 Mesh Fraction Using 75 Micron Urethane Screens

 

 

Five Deck Stack Sizers - 6" Hydrocyclone Underflow Installation