发明名称 |
METHOD FOR MANUFACTURE OF PAPER FILLER |
摘要 |
<p>Fillers for use in the paper industry are made by forming a is not >75 wt.% suspension of CaCO3 (opt. contg. impurities) in water and adjusting the pH of the suspension to 5-12 with organic and/or inorganic acid(s). The pH may be adjusted in two or more stages with different acids, or in several stages with a single acid. Process is esp. useful for treating the causticising sludge obtd. as a by-prod. in the regeneration of sulphate cellulose, and consisting mainly of CaCO3 contaminated with K,Na,Mg,OH,S and silicate ions, to give a material which can be used as a filler in papermaking. The slurry of causticising sludge may be mixed with a calcium hypochlorite slurry, using is not >25 pts. wt. Ca in the hypochlorite per 100 pts. wt. Ca in the causticising sludge. Up to 10 wt.% water glass may be added to the suspension before adding the acid.</p> |
申请公布号 |
BG38790(A3) |
申请公布日期 |
1986.02.28 |
申请号 |
BG19770037190 |
申请日期 |
1977.08.18 |
申请人 |
PAPIRIPARI VALLALAT |
发明人 |
BOZSITS,BELA;HERNADI,SANDOR;LAKNER,KALMAN;LELE,ISTVAN;LENGYEL,PAL;MEICHL,JANOS;STRAURER,KAROLY;SUEMEGI,MIHALY;SZALAY,ARPAD;TOMCSANYI,ELEMER |
分类号 |
D21C11/00;(IPC1-7):D21H3/66 |
主分类号 |
D21C11/00 |
代理机构 |
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代理人 |
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主权项 |
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地址 |
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