INCREASE OF PRODUCTIVITY OPERATING WITH TWO COARSE SEED FILTERS IN PARALLEL
Noronha A, Maués C, Moraes E, Silva D, Aldi J
Increased concentration of solids in the precipitators generally increases the generation of fines in the circuit. However a high concentration of fine particles results in the best condition for productivity from precipitation. The lines 1/2/3 of the precipitation circuit have disk filters to filter coarse seed that is pumped from the discharge of the secondary classifier. Each line has two filters, one operating and the other on stand-by.
In order to increase the solids concentration in the chain of precipitators without increasing the solids concentration in the overflow of the secondary classifier, a test was conducted with two coarse seed filters. The results of the test showed increased precipitation productivity because of the reduction in the median size of the fine particles (105 to 95 microns) and the increase in the concentration of solids to 440g/L at the end of chain.
The results also showed that an optimum operating condition in the thickeners was maintained as a result of the reduction in flow by 600m³/h and maintaining solids in the secondary overflow between 110 and 120g/L.