The present invention relates to a composition comprising water, more than
30% w/w of calcium hydroxide, and >0.2% w/w dispersant. A process for
preparing such a composition is also disclosed. The composition which can
be in the form of a 45-55% concentration lime slurry is particularly
useful for converting concentrated ammonium lignosulfonate into calcium
lignosulfonate, for converting ammonium lignosulfonate into low sulfate
calcium, potassium, sodium, or magnesium lignosulfonate and mixtures
thereof, for removing soluble sulfate from concentrated sodium,
potassium, ammonium or magnesium lignosulfonate or for treating a weak
liquor obtained from the pulp and paper industry.