What is claimed is:
1. A method for washing a crude lignin slurry formed from plant based raw material, wherein the method comprises:
separating a soluble carbohydrate containing fraction from the crude lignin slurry by using displacement washing in at least one solid-liquid separation stage so that the crude lignin slurry is prepressed, washed and...
FIELD OF THE INVENTION
The invention relates to a method and an apparatus for washing crude lignin slurry. Further, the invention relates to a soluble carbohydrate containing fraction and its use. Further, the invention relates to a solid fraction and its use.