Prediction of the Solubility of Recovery Boiler Precipitator Ash | Zendy

Daniel Moreira Saturnino | Zendy; Honghi Tran | Zendy

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Prediction of the Solubility of Recovery Boiler Precipitator Ash

Author(s) -

Daniel Moreira Saturnino,

Honghi Tran

Publication year - 2009

Publication title -

tappi journal

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 0.217

H-Index - 45

ISSN - 0734-1415

DOI - 10.32964/tj8.5.26

Subject(s) - solubility , slurry , fly ash , electrostatic precipitator , chemistry , boiler (water heating) , bottom ash , potassium , chloride , alkali metal , sulfate , waste management , environmental engineering , environmental science , organic chemistry , engineering

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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