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Role of the Surface Treatment in the Deflocculation of Kaolinite
Author(s) -
Andreola Fernanda,
Romagnoli Marcello,
Castellini Elena,
Lusvardi Gigliola,
Menabue Ledi
Publication year - 2006
Publication title -
journal of the american ceramic society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.9
H-Index - 196
eISSN - 1551-2916
pISSN - 0002-7820
DOI - 10.1111/j.1551-2916.2005.00814.x
Subject(s) - sodium hexametaphosphate , kaolinite , dispersant , rheology , dispersion (optics) , sodium , chemical engineering , materials science , phase (matter) , mineralogy , chemistry , composite material , metallurgy , organic chemistry , optics , physics , engineering
Suspensions of untreated and properly treated Na‐exchanged kaolinite have been subjected to rheological investigations using sodium hexametaphosphate (NaHMP) or sodium disilicate (DIS) as deflocculants. The treatment of the clay consisted of a 24 h contact with solutions of NaHMP or DIS and separation of the resulting solid phase. This was then used to form the suspensions subjected to the rheological measurements. The results indicate that the dispersion ability of each deflocculant is remarkably influenced by the type of treatment. In particular, with respect to the untreated kaolinite, the efficiency of DIS is dramatically increased when the clay has been previously treated with a NaHMP solution. On the other hand, a decrease in the dispersant ability of NaHMP is observed from the untreated kaolinite to the one previously treated with DIS.