METHOD OF EXTRACTION OF REACTION WOOD AND - OR NORMAL WOOD OUT OF NONSTANDARD LARGE WOOD CHIPS Russian patent published in 2005 - IPC

FIELD: pulp and paper industry.

SUBSTANCE: the invention presents a method of extraction of a reaction wood and-or normal wood from a nonstandard large wood chips and is intended for use in a pulp and paper industry. The invention provides for reduction of the nonstandard large wood chips to small-sized chips, their exsiccation with following mixture with water. Then the small-sized wood chips containing high density of extractive substances and having a high specific weight are settling. The settled small-sized wood chips are extracted for excretion of valuable extractive substances, in particular, lignites. The more light-weight small-sized chips floated on water surface are removed to return the normal timber for production of a paper stuff. The invention ensures a simple and economically efficient method of concentration of a gnarled timber material and-or normal timber out of a nonstandard large-scale wood chips. At that the process of concentration is so effective, that makes it economically expedient to recover the extractive substances from it.

EFFECT: the invention ensures a simple and economically efficient concentration of a gnarled and normal timber material out of a nonstandard large-scale wood chips.

8 cl, 1 dwg, 1 tbl, 3 ex