Process for removing sodium chloride and potassium salts from as

Details Process for removing sodium chloride and potassium salts from as Process for removing sodium chloride and potassium salts from as

1995-10-03

1998-11-24

Straub, Gary P.

Chemistry: physical processes

Physical processes

Crystallization

23302R, 23302T, 162 3011, 423208, B01D 902, C01D 516

Patent

active

058400850

ABSTRACT:
This invention relates to a process for removing sodium chloride and potassium salts, which are impurities concentrated and accumulated in pulp digesting chemicals, from ash collected from a soda recovery boiler. This process comprises the steps of (a) mixing ash collected from the combustion exhaust gas of the soda recovery boiler with water to form a slurry, adjusting the pH of the slurry to 10 or less by the addition of sulfuric acid, adjusting the temperature of the slurry to 20.degree. C. or above, and holding the slurry at that temperature for a sufficient time to cause sodium chloride and potassium salts present in the collected ash to be dissolved in the water; (b) cooling the slurry to a temperature below 20.degree. C. by the addition of ice and/or water so as to precipitate solid matter therefrom; and (c) separating the slurry into solid and liquid components and recovering the solid component while discharging the liquid component out of the system.

REFERENCES:
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patent: 5302246 (1994-04-01), Nykanen et al.
patent: 5549788 (1996-08-01), Nykanen et al.
patent: 5562807 (1996-10-01), Tuominiemi et al.

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