Mixing assembly and method for controlling mixing of green liquor and a flocculation agent

A mixing assembly for controlling mixing of green liquor and a flocculation agent, the mixing assembly comprising:

• a mixing vessel having a first end and a second end;
• a vessel inlet for supplying green liquor and flocculation agent to the mixing vessel in a vicinity of the first end;
• a vessel outlet for removing flocculated green liquor from the mixing vessel in a vicinity of the second end;
• and
• a stirring device that is rotatably arranged in the vicinity of the first end for mixing the green liquor and flocculation agent by stirring;
• wherein:
• the mixing vessel has a length from a center of the vessel inlet to a center of the vessel outlet, the mixing vessel has a maximum width (W) that is perpendicular to a center axis (B) that extends from the first end to the second end, and said length is at least 1.5 times the maximum width (W) for enabling decrease of turbulence in the mixed green liquor and flocculation agent.