کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
597558 1454070 2007 12 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Effect of polyacrylamide polymers on floc size and rheological behaviour of kaolinite suspensions
موضوعات مرتبط
مهندسی و علوم پایه مهندسی شیمی شیمی کلوئیدی و سطحی
پیش نمایش صفحه اول مقاله
Effect of polyacrylamide polymers on floc size and rheological behaviour of kaolinite suspensions
چکیده انگلیسی

The influence of cationic and anionic polyacrylamides (PAM) on the floc size, compressive yield stress, and rheological behaviour of kaolinite suspensions has been investigated at pH 7. At optimum polymer concentrations, the kaolinite floc sizes were larger in the presence of anionic PAM than cationic PAM. However, increasing the cationic and anionic surface charge from 10 to 35% reduces the floc size and increasing the anionic and catatonic molecular weight increases the floc size. The results show that the magnitude of the compressive yield stress, yield stress, critical stress, elastic and viscous modulus are strongly dependent upon the floc structure; with greater values being observed for the cationic PAM than for the anionic PAM. The difference in the compression or shear sensitivity of the flocculated slurries may be attributed to floc structure-related adsorption. It is found that the compressive yield stress, yield stress and viscoelastic behaviour are important factors that should be considered when selecting the type of polyelectrolyte for use in a particular solid–liquid separation. This work has been very successful in establishing the link between greater particle attraction and higher compressive yield stress yield stress, critical stress, and elastic and viscous modulus.

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Colloids and Surfaces A: Physicochemical and Engineering Aspects - Volume 301, Issues 1–3, 5 July 2007, Pages 311–322
نویسندگان
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