EC&S Inc.
5639 Millers Industrial Blvd. P.O. Box 100816
Birmingham, AL 35210 Tel: 205-833-9900 Fax: 205-833-9905 Contact: Bill Reeves Email:
wreeves@ecands.com Website:
www.ecands.com
EC&S / BHM Termal Sand Reclaimer
Dimensions: Varies with equipment size. Capacity Range: 0.25 to 10 metric tons/hour. Key Attributes: Te EC&S is purported to be the only
thermal sand reclamation system that can reclaim 100% clay-bonded sand, 100% chemically bonded sand or any mix of both sand types to a condition equal to or better than the new sand the foundry purchases. Te system is a fluidized bed design using close-coupled fluid beds that provide cal- cining, pre-cooling, sand cooling and sand scrubbing (in the case of green sand) on a continuous basis by hot air scrub-
bing and gravity transfer, absent of moving parts. In Operation: Excess (spent) sand is fed into the calcining chamber on a continuous basis at a constant rate. Calcin- ing heat is added with a controlled process temperature normally set at 1,350-1,650F (732-899C). Te sand leaves
Enviroair Inc.
W355S8902 Godfrey Ln Eagle, WI 53119-1465 Tel: 262-255-4700 Contact: Douglas Stenz Email:
dsstenz@enviroair.net Website:
www.enviroair.net
Termal Sand Reclamation Systems
Capacity: Seven standard models offer a capacity range of 0.5 to 10 tons/hour. Key Attributes:
• Low operating cost—less than $7/ton. • Stronger molds and cores using less binder. • Improved casting quality. • Fully automated system—low operator hours. • Robust, simple design—low maintenance. • Air cooling of reclaimed sand—no cooling tower or heat exchangers to maintain.
Enviroair’s facility includes a Model SR-0.5 Termal Sand Reclamation System capable of processing 1,000 lbs./hour of waste foundry sand. Tis system is available for customer
demonstrations and trials. In Operation: A sealed screw feeder feeds the waste sand at a constant rate into the rotary retort. In the rotary retort, the sand is uniformly heated to a temperature between 1,200 and 1,500F. Moisture on the sand is evaporated, and organic contaminants on the sand are oxidized. Natu-
October 2011 MODERN CASTING | 21
ral gas-fired burners fire inside the furnace section but outside of the retort. Te hot, clean foundry sand exits the rotary retort and drops into the rotary cooler drum. Te temperature of the sand leaving the cooling drum will be approximately 10 to 30F above ambient temperature. Te reclaimed sand is filtered through a 20-mesh screen before leaving cooling drum. Metal and other rejected material greater than 20-mesh flow over the filter screen and exit the cooling drum, where they can be collected in a con- tainer or transferred by a conveyor.
the chamber by flowing over a weir, then travels through the transfer duct by gravity into the precool chamber, where it is cooled by the fluidizing air. It discharges from the chamber between 700-850F (371-454C), and enters the sand cooler, where it is further cooled to 100F or 15F above ambient temperatures with fluidizing air (primary) and water cooled fin coils submerged in the fluid bed. If the sand being pro- cessed is green sand, it will flow directly into the sand scrub- ber section, which dislodges dead clay and residual organic materials from the sand grains. Te final reclaimed sand discharges with a temperature in the range of 100F to 120F.
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