| Abstract:In this paper, effect of heat-dispersing on dissolved and colloidal substances, and suspended solids was quantitatively investigated by varying temperature, disc clearance, and inlet pulp consistency. Furthermore, their removal in subsequent post-flotation was examined. The results showed that raising temperature, reducing disc clearance, or increasing pulp consistency improved significantly the dispersion of sticky substances, and increased amount of DCS in deinked pulp. Under temperature of 100℃, disc clearance of 0.3 mm, and pulp consistency of 30%, DCS, dissolved substances, and colloidal substances were increased by 13.6%~16.8%, 5.7%~5.9%, and 60.7%~65.3%, respectively. DS were as a major component in DCS, although CS were showed with a higher increasing rate after dispersion. SS were increased significantly after heat-dispersing, reached to 21.7%~26.0%. The post-flotation removed about 45.2%~46.7% of SS, and 6.1%~6.8% of CS, while only small amount of DS was removed. |
