Prediction of the Solubility of Recovery Boiler Precipitator Ash
Source abstract
Abstract
The solubility of recovery boiler precipitator ash in water is important in the design and operation of ash treatment systems used to control chloride (Cl) and potassium (K) accumulation in the kraft recovery cycle. We determined the solubility of mixtures of alkali salts that constitute precipitator ash and several precipitator ash sam-ples, through laboratory experiments and theoretical simulation using a commercially available thermodynamic pro- gram. The solubility of precipitator ash in water at 85°C varies widely, from 400–550 g/L H2O, depending on ash composition. The composition of the liquid portion of an ash-water slurry changes significantly with an increase in ash concentration: the Cl concentration increases, the sulfate (SO4) concentration decreases, and the K and carbon-ate (CO3) concentration remain the same. Between 30ºC–100ºC, temperature has little effect on the solubility of pre-cipitator ash and on the composition of the liquid portion of the slurry.
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Research context
OpenAlex topics: Chemical and Physical Properties in Aqueous Solutions · Chemical Looping and Thermochemical Processes · Crystallization and Solubility Studies
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References (16)
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