Study on CPAM/Attapulgite Microparticle Retention System
The microparticle retention system considered in this paper was made up with attapulgite(ATT)after purification and acid activation,in addition to cationic polyacrylamides(CPAM).Properties of the CPAM/ATT system were studied under various environments of the papermaking process,simulated with the Dynamic Drainage/Retention Jar(DDJ).Factors affecting this system,including dosage of ATT,dosage of CPAM,relative molecular weight of CPAM,pH value,and shear force were studied.The wet-end chemical mechanism was studied by means of the streaming current and streaming potential methods.The results showed that CPAM/ATT system had better effect on APMP(Alkaline Peroxide Mechanical Pulp)than single-component CPAM system.FPR increased with the dosage of ATT and CPAM.Molecular weight and charge density of CPAM had large effect on retention property of CPAM/ATT system,and the effect of charge density was more notable.In both single-component CPAM system and CPAM/ATT system,cationic demand decreased and Zeta potential increased with charge density and molecular weight of CPAM increasing.Addition of ATT could also decrease cationic demand further,due to its high specific surface area,high porosity and high adsorption capacity.At alkaline pH value,property of CPAM/ATT retention system became worse because charge density of CPAM decreased with pH value.Retention mechanism of CPAM/ATT system conformed to what can be expected for a microparticle retention system.High shear force which broke down the floes formed by polymeric bridging was important.CPAM/ATT system was able to achieve acceptable levels of retention at high shear force by the ability of microparticle system to produce shear-resistant flocs which can also reflocculate after dispersion.
attapulgite CPAM microparticle retention system
HU HUIREN HU FANG ZHENG E
Tianjin Key Lab of Pulp & Paper,Tianjin University of Science & Technology,Tianjin,300457,China
国际会议
第二届国际造纸与环境学术会议(The Second International Papermaking & Environment Conference)
天津
英文
785-789
2008-05-14（万方平台首次上网日期，不代表论文的发表时间）