Title:
PROCESS FOR TREATING LIGNOCELLULOSE MATERIAL
Document Type and Number:
Japanese Patent JPS5234003
Kind Code:
A
Abstract:
Lignocellulose pulp suspension is treated with a soluble Ca salt, esp CaCl2, which forms, no insoluble salts with heavy metals. Treatment may take place in refiner or on dilution, after refiner, After a given retention time, the Ca salt is washed out of pulp suspension. Peroxide-bleaching may take place by standard methods. Pref. CaCl2-treatment takes place with a CaCl2 concn. >0.75, esp >1.4 g/l, for >0.5-, esp >10 mins. CaCl2 may be charged with recycle water from subsequent process steps. Part of the CaCl2 may be retained in the pulp. Brightness of bleached pulp corresponds at least to that obtd. in bleaching a groundwood pulp suspension.
Inventors:
GERAN ERITSUKU ANNERUGUREEN
PEERUUUUROBU RINDOBURATSUDO
TEYUERUUOOKE HETSUGURUNDO
PEERUUUUROBU RINDOBURATSUDO
TEYUERUUOOKE HETSUGURUNDO
Application Number:
JP9310876A
Publication Date:
March 15, 1977
Filing Date:
August 03, 1976
Export Citation:
Assignee:
SCA DEVELOPMENT AB
International Classes:
D21B1/16; D21C9/16; D21C9/10; (IPC1-7): D21C9/16
Foreign References:
| US3507744A | 1970-04-21 |