IMPROVING THE PERFORMANCE OF BENTONITE-BASED MICROPARTICLE RETENTION AID
Na-bentonite was prepared by reacting Ca-bentonite with either sodium fluoride or sodium carbonate via ion-exchange mechanism. XRD, TEM, particle size and viscosity measurement were used to evaluate the ionexchange degree, compare the morphology, particle aggregation and swelling of the modified bentonite, respectively. The synergistic retention and drainage effects of the modified bentonite with CPAM were also investigated. The results showed that the Cabentonite altered to Na-bentonite when 4% of sodiuM fluoride (based on the weight of bentonite) was used as ion-exchanger. The sodium fluoride-modified bentonite was dispersed well in water, yet its suspension showed lower viscosity than that of sodiuM carbonate-modified bentonite. It exhibited a better performance on improving the retention and drainage of the wheat straw pulp than the bentonite modified by sodium carbonate. More importantly, it could sustain its good performance even after four weeks as a suspension. The maximum improvement on the retention and drainage of the wheat straw pulp occurred when the calcium ions among the layers of bentonite are just completely exchanged by the sodiuM ions.
bentonite microparticle retention modification cationic polyacrylamide
Dong Yuanfeng Liu Wenxia
Shandong Key Laboratory of Pulp and Paper Engineering, Shandong Institute of Light Industry, Jinan, 250100, China
国际会议
广州
英文
603-607
2006-11-08（万方平台首次上网日期，不代表论文的发表时间）