and the recovery of the greater part of its inorganic components or na 2 so 4 caso 4 k 2 so 4 al 2 so 4 iron sulfates or mgso 4 preferably na 2 so 4 is used according to a preferred embodiment of the first aspect of the invention mixing is performed after the adjustment of the ph level in step b according to a preferred embodiment of the first aspect of the invention the ph level is adjusted to below approximately ph 9 5 in step b preferably below approximately ph 6 most preferred the ph level is a ph from 1 to 4 according to a preferred embodiment of the first aspect of the invention the ph level is adjusted whereby using co 2 according to a preferred embodiment of the first aspect of the invention the temperature is varied from 20 to 100 u00b0 c depending on the nature of the liquid slurry containing lignin such as black liquor according to a preferred embodiment of the first aspect of the invention the filtrate from step c is re circulated directly to a recovery system preferably after re alkalization according to a preferred embodiment of the second aspect of the invention the addition of step i is done by adding recovery boiler ashes or na 2 so 4 caso 4 k 2 so 4 al 2 so 4 iron sulfates and or mgso 4 preferably na 2 so 4 is used according to a preferred embodiment of the second aspect of the invention mixing is performed after the acidifying in step i according to a preferred embodiment of the second aspect of the invention the ph level is adjusted in step i through acidifying.