摘要
造纸白水封闭循环是解决纸厂节约用水的有效途径之一,除去与控制白水中DCS是其关键技术。实验室模拟循环抄纸过程,应用常规助留助滤剂与纳米TiO2胶体及其二元复配助留助滤剂体系,测定白水中COD值,以其表征DCS浓度随着抄纸循环次数增加的变化规律,研究结果表明:当不使用或使用常规助留助滤剂时,白水中的DCS浓度随循环次数增加而增大;但当使用纳米TiO2胶体或其相应二元复合体系作为助留助滤剂时,白水中的DCS在初始阶段增加,随即达到稳定值。这一研究结果说明纳米TiO2胶体具有除去与控制白水中DCS的功能。纳米TiO2胶体对DCS溶液自动滴定作用机理研究显示,这一功能是通过吸附絮凝起作用的,絮凝过程并非电荷中和引起。
The removal and control way of DCS in the papermaking whitewater is a key technique for whitewater closure, which is used for reducing water comsuption in process. A dual-component system retention aid containing nanosized TiO2 for removal of dissolved and colloidal substances （DCS） from deinked pulp （DIP） was investigated by simulated recycling whitewater in the laboratory. When either Nano-TiO2/AmS or Nano -TiO2/APAM was used in the repeated handsheet- making process, the COD value of whitewater first increased and then approached the equilibrium state with recycling. The results indicated that the Nano-TiO2 colloid has the function of removal and control of the DCS in whitewater. The function has been finished with the flocculation of nanometered TiO2 and DCS, inducing from the electrostatic action. The removal of DCS arose from the bridging floeculation mechanism but not charge neutralization.
出处
《造纸科学与技术》
北大核心
2009年第6期107-109,120,共4页
Paper Science & Technology
基金
广东省循环经济型钛产业共生代谢及其关键技术示范工程项目(编号:2007A090302069)
