THE APPLICATION OF NANO-SCALE TITANIUM DIOXIDE IN RECYCLED FIBER DEINKING PROCESS
The influence of nano-scale titanium dioxide on the colloid chemistry of three conventional secondary fibers was studied. The application of nano-scale titanium dioxide in the recycled fiber deinking process was also studied. The colloid chemistry characteristics were based on the measurement of Zeta potential of the deinking pulp system and contact angle of pulp aqueous. The handsheet brightness and ERIC (effective residual ink concentration) of the deinked pulp (DIP) properties were characterized. Experimental results showed that the Zeta potential of deinking pulp would increase as the adding dosage of nano-scale titanium dioxide increased in a given range (0～0.06%) and the contact angle of pulp aqueous would decrease simultaneously. When the dosage of nano-scale titanium dioxide reached 0.06%, the Zeta potential of ONP, OMG and MOW deinking system increased by-4.3mV,-7.3mV and-5.7mV contrasted with blank test respectively, and the contact angle of three kinds of recycled pulp aqueous decreased by 6.8°, 7.5° and 12.1° respectively. Meanwhile, the brightness and ERIC of three kinds of DIP were improved simultaneously. When the dosage of nano-scale titanium dioxide reached 0.04%, the brightness of three kinds of DIP increased by 0.4, 1.3 and 5.4 percent point respectively contrasted with blank test, and ERIC of the three kinds DIP decreased by 73.3%, 64.3% and 8.0% respectively. Based on the finished experimental results, the flotation deinking mechanism of adding nano-scale titaniuM dioxide to the deinking system was also discussed.
deinking nano-scale titanium diozide Zeta potential contact angle DIP quality
Hua Siwen Han Qing Liu Ning
College of Papermaking Engineering, Shaanxi University of Science and Technology, Xianyang, 712081, China
国际会议
广州
英文
297-300
2006-11-08（万方平台首次上网日期，不代表论文的发表时间）