Effects of Some Multivalent Ions on Coagulation and Electrokinetic Behaviours of Colemanite Particles
Küçük Resim Yok
Tarih
2013
Yazarlar
Dergi Başlığı
Dergi ISSN
Cilt Başlığı
Yayıncı
CSIRO PUBLISHING
Erişim Hakkı
info:eu-repo/semantics/closedAccess
Özet
The effects of magnesium, barium, aluminium, and ferric cations as multivalent ions on the coagulation and electrokinetic behaviours of colemanite have been investigated in relation to pH and cation concentration. The zero point of charge for colemanite was determined to be at pH 10.2. The positive surface charge of colemanite increased in the presence of multivalent ions at pH values below the zero point of charge. Also, these ions changed the zeta potential of colemanite from negative to positive within the pH range 10.2 to 12. In the experiments, the coagulation of colemanite with ferric ions was more efficient than with the other ions and the effect of ferric ions varied considerably depending on the concentration and pH. The coagulation recovery values of colemanite suspension increased quickly up to 2.5 x 10(-3) M concentration of ferric ions and the maximum value (similar to 93 %) was obtained at a pH of 11.5. It was also found that the coagulation behaviour of the colemanite suspension in the presence of multivalent cations was in good agreement with the electrokinetic characteristics.
Açıklama
Anahtar Kelimeler
Kaynak
AUSTRALIAN JOURNAL OF CHEMISTRY
WoS Q Değeri
Q2
Scopus Q Değeri
Q3
Cilt
66
Sayı
1
