| 摘要 |
<p>In a method of recovering cellulose fibres from waste paper etc., a dispersion of the raw material in water is separated by flotation into a first fraction, rich in fibres, and a second fraction, enriched in hydrophobic impurities, mainly printing ink, and the second fraction undergoes further treatment including separation by sieving into one fraction, rich in fibres, which is recirculated to the flotation stage, and another fraction which is further enriched in hydrophobic impurities and further purified. As shown, the second fraction from the flotation stage can be separated by a hydrocyclone separator plant into a fraction rich in fibres, which is further separated by sieving, a fraction enriched with hydrophobic impurities which is mixed with the fraction having passed through the sieve, for further purification, and a third fraction of heavy impurities, which is rejected. <IMAGE></p> |
