| 摘要 |
<p>A procedure wherein printed waste paper is treated in a pulper under alkaline pH conditions by means of an alkali metal silicate, oxidising bleaching agents, higher fatty and/or resin acids and dispersants and the released particles of printing ink are separated from the suspension of fibres by flotation, where the fatty and/or resin acids are used in the form of their alkaline earth metal salts finely distributed together with dispersants in an oil-in-water dispersion which is liquid at room temperature.</p> |
