| 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> |
| 申请人 |
PAPIRIPARI,VALLALAT |
发明人 |
BOZSITS,BELA,DIPL.-ING.;HERNADI,SANDOR,DIPL.-ING.DR.;LAKNER,KALMAN,DIPL.-ING.;LELE,ISTVAN,DIPL.-ING.;LENGYEL,PAL,DIPL.-ING.DR.;HEICHL,JANOS,DIPL.-ING.;STRAUBER,KAROLY,DIPL.-ING.;SUEMEGI,MILHALY,DIPL.-ING.DR.;SZALAY,ARPAD,DIPL.-ING.;TOMCSANYI,ELEMER,DIPL.-ING. |
