Cement plant CKD recovery system

Book · Tue Dec 31 04:00:00 EST 1996

OSTI ID:495374

Cohen, S M; Prokesch, M E ^[1]

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1. Fuller Co., Bethlehem, PA (United States)

A fluid bed system has been developed to produce a low alkali cement clinker from cement plant kiln ducts (CKD). The system is comprised of three main components: feed preparation system, fluid bed reactor and process gas handling system. Cement kiln dust is first pelletized and dried, then processed at 1,300--1,320 C in the fluid bed reactor. The combination of excellent thermal transfer and extended retention time at reaction temperatures provides typical volatilization rates on the order of 90% K{sub 2}O, 70% Na{sub 2}O, 90% SO{sub 3}, and 95% Cl. High concentrations of volatilized alkali compounds in the process off gas stream are cooled and condensed in a specially designed heat exchange system while providing preheated process air for the fluid bed reactor. Condensed alkali compounds are collected at the dust collector in the form of a fine, white powder. This co-product may offer marketable value due to its high concentration of potassium sulfates. The system offers the potential for a 100% recovery of cement kiln dusts to produce cement clinker and an alkali co-product.

• OSTI ID: 495374
• Report Number(s): CONF-9504119--
• Country of Publication: United States
• Language: English

Related Subjects

32 ENERGY CONSERVATION, CONSUMPTION, AND UTILIZATION
CEMENT INDUSTRY
CEMENTS
EXPERIMENTAL DATA
FLUIDIZED BED REACTORS
INDUSTRIAL WASTES
MATERIALS RECOVERY
OPERATION
RESOURCE RECOVERY FACILITIES
WASTE MANAGEMENT
WASTE PRODUCT UTILIZATION