Title:
アルカリ性洗浄液の精製
Document Type and Number:
Japanese Patent JP2006522235
Kind Code:
A
Abstract:
A method for washing sulphate cellulose pulp in the washing department of a sulphate cellulose mill, in which method a first pulp flow ( 1 ) is conducted to a first washer ( 101 ), where a washing liquid ( 12 ) is combined with the first pulp flow ( 1 ). A second pulp flow ( 2 ) is conducted from the first washer ( 101 ) to a second washer ( 102 ), where a washing liquid ( 3 ) is combined with the second pulp flow ( 2 ). The washed pulp flow ( 5 ) is proceeded from the second washer ( 102 ) in the process and the filtrate ( 4 ) displaced by the washing liquid ( 3 ) is recycled to the process so that the filtrate ( 4 ) displaced by the washing liquid ( 3 ) in the second washer ( 102 ) is divided into a first part flow ( 6 ) and a second part flow ( 7 ) and the pH of the second part flow ( 7 ) is dropped by combining an acidifier ( 8 ) with the second part flow ( 7 ). The acidified part flow ( 9 ) is conducted to a process unit ( 103 ), where sludge ( 10 ) containing extractives and metals is separated from the part flow ( 9 ) and the entire process and the part flow ( 11 ) treated in the process unit ( 103 ) is combined with the first part flow ( 6 ) and is recycled to the process for use as the washing liquid ( 12 ) in the first washer ( 101 ).
Inventors:
Pig, Pasi
Sony, Hannu
Tronen, Maruyo
Sony, Hannu
Tronen, Maruyo
Application Number:
JP2006505631A
Publication Date:
September 28, 2006
Filing Date:
April 06, 2004
Export Citation:
Assignee:
Stra Enso Yurkinen Osaki Yukiture
International Classes:
D21C9/02; D21C3/02; D21C11/00; D21C
Attorney, Agent or Firm:
Takashima Ichi