By Robert L. Virta

1 ZEOLITESBy Robert L. VirtaZeolites are hydrated aluminosilicates of the alkaline and200 tons. In the case of odor-control applications, consumptionalkaline-earth metals. Approximately 40 natural zeolites havedoubled. Consumption declined for animal feed, oil absorbent,been identified over the past 200 years, the most common ofand pet litter applications. The largest decrease was for animalwhich are analcime, chabazite, clinoptilolite, erionite, ferrierite,feed applications, where sales declined 7%. Sales to the oilheulandite, laumontite, mordenite, and phillipsite. More thanabsorbent and pet litter applications declined 5% and 2%,150 zeolites have been synthesized. Some of the more zeolites are zeolites A, X, Y, and ZMS-5. Natural andsynthetic zeolites are used commercially because of their uniqueadsorption, ion-exchange, molecular sieve, and ZeolitesNatural zeolites for consumer products, such as for pet litter,Commercial zeolite deposits in the United States areassociated with the alteration of volcanic tuffs in saline, alkalinelake deposits and open hydrologic systems.

1 ZEOLITES By Robert L. Virta Zeolites are hydrated aluminosilicates of the alkaline and 200 tons. In the case of odor-control applications, consumption

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