Trace element (TE) distributions for As, Cd, Cr, Mn, Ni and Pb have been studied around the recovery boiler of a softwood kraft mill [1].The fate of these elements is of interest in closed cycle mills, where their toxicity could be an issue. An extensive sampling program was conducted in the mill, which had a production rate of 1700 adt/d, and used TCF bleaching. The black liquor was fired at 80%, and the capacity of the recovery boiler (RB) was 3000 t BLS/d. The lime kiln had a capacity of 500 t CaO/d; the lime was dried from 80% to 100% dry solids before burning. About 2% of the CaO used in the causticizing was added as make-up lime. Click to continue »
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