{HEAD ~ The temperature} at which the second stream of aluminum trihydroxide particles is dissolved in {TAIL ~ the spent liquor fraction} is suitably between 80° and 250° C., preferably between 100° and 220° C., more preferably between 120° and 180° C 
{ HEAD ~ The temperature } at which the second stream of aluminum trihydroxide particles is dissolved in { TAIL ~ the spent liquor fraction } is suitably between 80 ° and 250 ° C. , preferably between 100 ° and 220 ° C. , more preferably between 120 ° and 180 ° C
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