D - Textiles – Paper – 21 – D
Patent
D - Textiles, Paper
21
D
D21D 5/24 (2006.01) B03B 13/00 (2006.01) B04C 5/103 (2006.01)
Patent
CA 2235384
Relatively heavy contaminants are separated from a contaminated pulp suspension by pumping the latter through a multihydrocyclone unit (6) having a multiplicity of hydrocyclones. Each hydrocyclone is provided with turbulence creating means adapted to counteract the formation of fibre network in radially outer liquid layers in the hydrocyclone. The pulp suspension separated from heavy contaminants is dewatered in a pulp wet machine (2). According to the invention, the fibre concentration of the pulp suspension which is fed into the multihydrocyclone unit (6) is at least 0,9 %.
L'invention concerne la séparation d'impuretés relativement lourdes qui souillent une suspension de pâte à papier, par pompage de la suspension dans une unité multihydrocyclone (6) comportant une pluralité d'hydrocyclones. Chaque hydrocyclone est équipé d'un dispositif créant des turbulences dont l'action s'oppose à la formation d'un réseau fibreux dans les couches liquides radiales extérieures de l'hydrocyclone. La suspension de pâte débarrassée des impuretés lourdes est essorée dans une presse-pâte humide (2). En l'occurrence, la concentration fibreuse de la suspension injectée dans l'unité multihydrocyclone (6) est d'au moins 0,9 %.
Andersson Roine
Backman Jan
Alfa Laval Ab
Borden Ladner Gervais Llp
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