AbstractA study was undertaken to reduce emissions from a calciner stack. Tests were conducted to characterize the particle size distribution, effluent loading, and chemical composition. Several methods for reducing emissions were evaluated. The source of the effluent was found to be due to some combination of: excessive mist carryover from a spraytower, flashing of high solids concentration quench liquid, poor flow patterns, a large quantity of fine particles, condensation of metal vapors, or gas phase reaction which formed fine particles. A series of studies were conducted to improve the operation of the spray tower. As only limited success was achieved with these methods several other control devices were evaluated. This article discusses (1) the methodology used to evaluate the cause of the effluent problem, (2) the principles followed in obtaining a representative slipstream, and (3) the performance of the three devices tested, along with parameters which affect performance.
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