高分子质量阳离子聚丙烯酰胺助留机理的探讨

利用胶体滴定技术和Zeta电位测定法相结合的方法分析单独添加CPAM和先加入PAC后再加入CPAM时浆料的电荷和电位.结果表明:单独添加CPAM时,浆料Zeta电位变化较小,胶体滴定比值CTR变化较明显;先加入PAC后再加入CPAM时,浆料溶解净电荷变化很小,而Zeta电位变化较大.这说明PAC和CPAM对浆料体系的作用效果不同.PAC的作用是中和浆料体系的溶解净电荷,而CPAM则主要是作用于浆料体系的固体颗粒,不应过多地受溶解净电荷的干扰.

Study on the Retention Mechanisms of High Molecular Weight Cationic Polyacrylamide

In this paper, colloid titration and Zeta potential analysis were applied to measure the charge and Zeta potential of paper furnish under the conditions of only adding CPAM and adding both CPAM and polyaluminum chloride (PAC). Results showed that if only CPAM was added, the Zeta potential of the furnish changed little but CTR changed obviously. If the CPAM was added after the PAC, the dissolved charge of the furnish changed little while the Zeta potential changed more. That illustrated that the function of PAC and CPAM in the furnish system was different. PAC could eliminate the anionic trash but could not significantly increase the Zeta potential, which benefited the bridging flocculation of CPAM and reduced the consumption of CPAM.