| 摘要 |
<p>PURPOSE: To improve pulp-deinking efficiency and pulp-treating capacity for pulp by a froth flotation method by finely comminuting recycled paper to prepare a paper suspension of a low consistency and then feeding the suspension into a froth flotation device such as a hydrocyclone. CONSTITUTION: This method for deinking recycled paper and removing sticky contaminants comprises finely comminuting recycled paper having the sticky contaminants such as printed letters on the surface, feeding the prepared suspension having a solid consistency of about 1-4% to the end 44 of a vortex 41 in a hydrocyclone 31 or the like from a suspension inlet 46, introducing sparging air from an inlet 49 into the vortex 41 through an inner space 48 and a porous wall 47 to prepare a foam layer to which hydrophilic sticky contaminants and/or ink particles are adhered, and then transferring the foam layer to an overflow exit 51, while removing the cellulose pulp layer from an exit 52 close to the bottom portion.</p> |
