1. A method for separation of lignin from original black liquor (BLIN) having a first alkaline pH value, comprising the following stages in sequence:
in a first precipitation stage (PR), adding an acidifier charge to an original black liquor in order to decrease a pH value of the original black liquor...
This is a continuation-in-part patent application that claims priority from U.S. national phase patent application Ser. No. 14/761,525, filed 16 Jul., 2015, that claims priority from International Patent Application No. PCT/SE2013/050051, on 24 Jan. 2013.