Effects of Some Multivalent Ions on Coagulation and Electrokinetic Behaviours of Colemanite Particles
Havvanur Ucbeyiay A C and Alper Ozkan BA Department of Mining Engineering, Seydisehir Ahmet Cengiz Engineering Faculty, Selcuk University, Seydisehir, 42370 Konya, Turkey.
B Department of Mining Engineering, Engineering and Architecture Faculty, Selcuk University, 42075 Konya, Turkey.
C Corresponding author. Email: hucbeyi@selcuk.edu.tr
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Assistant Professor Dr. Havvanur Ucbeyiay was born in Konya, Turkey, in 1979. She graduated from the Mining Engineering Department of Selcuk University in 2003. She received her Master of Science (M.Sc.) degree and her Doctor of Philosophy (Ph.D.) degree in Mineral Processing at Selcuk University in 2005 and 2010, respectively. She has been at the Department of Mining Engineering at Selcuk University Seydisehir Ahmet Cengiz Engineering Faculty as Assistant Professor since 2011. Her major research interests involve flotation and flocculation. |
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Professor Dr. Alper Ozkan was born in Sivas, Turkey, in 1971. He graduated from the Mining Engineering Department of Cumhuriyet University in 1994. He received his Master of Science (M.Sc.) degree and his Doctor of Philosophy (Ph.D.) degree in Mineral Processing at Cumhuriyet University in 1996 and 2001, respectively. He has been in the Department of Mining Engineering at Selcuk University since 2003. His major research interests involve flotation, flocculation, and grinding. |
Australian Journal of Chemistry 66(1) 3-8 https://doi.org/10.1071/CH12340
Submitted: 18 July 2012 Accepted: 22 September 2012 Published: 31 October 2012
Abstract
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 × 10–3 M concentration of ferric ions and the maximum value (~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.
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