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1.发明授权Bleaching of mechanical pulps with hydrosulfite in the presence of an alkali metal silikate 失效在ALKALI金属硅酸盐存在下，具有氢化石墨的机械粉末的漂白
公开(公告)号：US3709779A
公开(公告)日：1973-01-09
申请号：US3709779D
申请日：1971-11-17
Applicant: INT PAPER CANADA
Inventor： GUPTA V
IPC: D21C9/10
CPC classification number: D21C9/1036
Abstract: A PROCESS IS DESCRIBED IN WHICH MECHANICAL PULPS ARE BLEACHED WITH SODIUM OR ZINC HYDROSULFITE IN THE PRESENCE OF SODIUM SILICATE. THE ADDITION OF SILICATE INCREASES THE BRIGHTNESS GAIN OBTAINED BY HYDROSULFITE ALONE AND REDUCES THE GRINDING POWDER CONSUMPTION. SILICATE CAN THUS REPLACE SODIUM TRIPOLYPHOSPHATE FOR THIS USE AND THEREBY ELIMINATE PHOSPHATE POLLUTION DUE TO NEWSPRINT OR OTHER PAPER MILL EFFLUENTS.
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