Pit & Quarry, February 2017
scREEnIng The Morrison Quarry is situated in Jefferson County Colorado However after consulting with Sam Durnavich regional manager of Polydeck the operation was presented with a modular synthetic screen panel solution that would compare favorably or even exceed the open area of wire cloth while says the manufacturer delivering greater wear life and ease of installation over that of traditional wire cloth Durnavich before joining the Polydeck organization had served as the assistant plant manager at the Morrison Quarry more than a decade ago With his knowledge of the operation he could work closely with the Polydeck engineering team to create a media solution that would more effectively address common carryover challenges That is the background behind the design of DMax screen panels which are intended for use where open area and throughput are the most important considerations ExcEEdIng PRodUcTIon goAls Since the installation of the first DMax screen panels on two of the middle decks in October 2015 the operation can meet if not exceed production goals while achieving far greater screening efficiency According to Vanatta they are realizing nearly 54 percent open area on their middle decks with the use of the new panels Compared to the 42 percent open area delivered by the previous screen deck they have the advantage of a 285 percent increase in open area DMax panels were subsequently installed on a third middle deck in mid 2016 That open area increase has resulted in an 11 percent increase in the production of the profitable 1 in rock and fines were reduced by nearly 1 percent Vanatta says The only downside to the open area is that the panels wear a little faster but that is essentially irrelevant as the profit from the tonnage increase pays for the screen media investment more than 10 times over The quarr y employs standard Polydeck Rubberdex modular screen panels on the top and bottom decks of their 8 ft x 20 ft tertiary screens EngInEERIng ExPERTIsE Durnavich says the DMax screen panel system is formulated with either rubber or polyurethane depending upon the application Weve made the DMax panels with bridges that are half the width of those on our standard maxi panel he says However the bridges are much deeper He goes on to explain that reducing bridge width between apertures allows more openings in the screen panel surface which translates to increased product pass through The increases in open area do come with a reduction in wear life Yet when compared to standard duty screen panels According to the manufacturer the wear life of the operations new screen panels exceeds that of wire cloth Our actual field results in several applications have demonstrated production increases all the way up to 50 percent and screening efficiency increases of more than 25 percent Sam Durnavich Polydeck Screen corP 38 PIT QUARRY February 2017 pitandquarry com
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