USE OF CHELATING SURFAC-TANTS AS COMPLEXING AGENTS FOR REMOVAL OF MANGANESE FROM MECHANICAL PULP FIBRES PRIOR TO HYDROGEN PEROXIDE BLEACHING
In this investigation a new type of recoverable complexing agent (chelating surfactant) has been compared with a conventional complexing agent (DTPA) in the metal ion management of thermomechanical pulps (TMP) to be hydrogen peroxide bleached. After different degrees of washing of the pulps, bleaching experiments at different total alkali charges were performed with and without sodium silicate additions, and the ISO brightness of hand-made sheets was measured. The residual hydrogen peroxide in the bleaching liquor was also determined. No significant difference in either the brightness development or the residual hydrogen peroxide content could be detected between the pulps treated with equivalent molar ratios of the different complexing agents. Furthermore, the recovery of the surfactant-manganese complexes from laboratory made white water by foam flotation was also studied. Two different foaming agents, SDS and DDAO, were tested. After an addition of 160 ppm of the latter surfactant, about 80％ of the manganese chelates could be recovered in the foam, containing 3％ of the initial water mass.
hydrogen peroxide bleaching manganese chelating surfactant DTP A brightness flotation recovery
Ida HOgberg Anette Karlsson Bengt Wikman Dariusz Zasadowski Fredrik Andersson Erik Hedenstrom Hakan Edlund Magnus Norgren
Fibre Science and Communication Network (FSCN), Mid Sweden University, SE-85170 Sundsvall, Sweden Fibre Science and Communication Network (FSCN), Mid Sweden University, SE-85170 Sundsvall, Sweden SC SCA R&D Centre, P.O. Box 716, SE-851 21 Sundsvall, Sweden
国际会议
16th International Symposium on Wood,Fiber and Pulping Chemistry(第十六届木材、纤维及制浆化学国际会议)
天津
英文
682-686
2011-06-08（万方平台首次上网日期，不代表论文的发表时间）