Influence of dispersant nature and concentration on the rheological properties of kaolin suspensions

• Autorzy: Papo, A. , Piani, L.
• Konferencja: Proceedings of the International Conference on Engineering Rheology ICER '99
• Języki publikacji: EN

Abstrakty

EN

The aim of the present work is to evaluate the effectiveness of some commercial dispersing agents employed for maximizing the solid loading of kaolin suspensions. Two commercial deflocculants were used: a sodium polyacrylate (Reotan L) and a sodium benzenedisulfonate (Tiron). Kaolin aqueous suspensions were prepared at various solid contents (40 to 55 wt%). Rheological tests were carried out at 25oC by using the rate controlled coaxial cylinder viscometer Rotovisko-Haake 20, system M5-osc., measuring device MV1P with serrated surfaces. The tests were performed under both continuous and oscillatory flow conditions. All the suspensions prepared without deflocculant show a rheological behaviour of the shearthinning type. The slurries prepared with Tiron present the same flow behaviour as the plain suspensions, whereas the addition of Reotan L brings about a shearthickening behaviour above a critical deflocculant concentration. The application of oscillatory techniques permitted to evaluate more accurately the efficiency of the dispersing agents. The sodium polyacrylate proved to be more effective than the benzenedisulfonate as dispersant for kaolin slurries.

Słowa kluczowe

PL

reologia

EN

suspensions; kaolin; dispersants

• Czasopismo: Applied Mechanics and Engineering
• Rocznik: 1999
• Tom: Vol. 4, no spec.
• Strony: 381-385
• Opis fizyczny: Bibliogr. 3 poz., wykr.

Twórcy

autor

Papo, A.

autor

Piani, L.

• Dipartimento di Scienze e Tecnologie Chimiche. Universita degli Studi di Udine. Via Cotonificio, 108. I-33100 Udine. Fax: [phone], ITALY