Cement Finish Mill, High Efficiency Separator

  
The system is comprised of a 5.6' x 2.6' hydraulic roll press with an 1,800 hp motor, an 18.4' high efficiency SEPAX® separator with a 450 hp motor, and a 14.5' x 25' ball mill with a 3,000 hp motor. The baghouse provides mill sweep and the high efficiency separator ventilation. The conventional filter media operated with a high differential pressure of 8 to 10" H2O, reduced airflows, and an initial production rate of 90 tons per hour decreasing to 50 to 60 tons per hour after six months of filter service.

GORE® Membrane Filter Bag Experience

Collector Designation: DC-3 finish mill
Collector Manufacturer: MikroPul
Process Description: Finish mill sweep/SEPAX® ventilation
Model Number: 720-3-12-20-TR
Particulate Collected: Finished cement
Design Airflow Rate: 140,000 cfm
Design Temperature: 165º F
No. Bags/Compartment: 720
Inlet Grain Loading: 250 gr/cf max.
No. Bags/Collector: 1,440
Particulate Bulk Density: 60-80 lbs/cf
Bag Dimensions: 5.625" dia. x 144" long
Particle Size: 85% < 350 mesh
Cleaning System: Pulse jet
Bag Material: GORE-TEX® membrane/ heavy duty polyester felt (16 oz)
Top of Bag Configuration: Grooved snap band
Air-to-Cloth Ratio Design: Net 5.5:1
Date Installed: 1st set: May 1992
2nd set: July 1995

The first set of GORE® membrane filter bags operated consistently at 5" w.g. at an air-to-cloth ratio of 5.1:1. Mill production increased to an average of 105 tons per hour with an emission rate of 0.002 grains/cubic foot. The first set of GORE® membrane filter bags were installed for 3.25 years and were replaced with a second set of GORE® membrane filter bags.