Ali GÜNEY, M.Olgaç KANGAL

Anyonik toplayıcılar varlığında huntitin $(Mg_3Ca(CO_3)_4)$, flotasyon davranışı

Bu çalışmada, KOl ve Flotinor FS-2 gibi anyonik toplayıcılar varlığında, huntitin flotasyon davranışı ve elektrokinetik özellikleri belirlenerek; $Mg^{+2}$ ve $Ca^{+2}$ gibi ortak iyonların etkisi araştırılmıştır. Ayrıca, huntitin yüzey özelliklerinde $Na_2SiO_3.5H_2O$, CMC gibi kontrol reaktiflerinin ve pH’nın etkisi incelenmiştir. Elektrokinetik ölçümler, huntitin eş elektrik noktasının 8.0 olduğunu göstermektedir. 10-2 M $MgCl_2$ ve $CaCl_2$ kullanıldığında, huntitin yüzey yükü pozitif olmaktadır. KOl, Flotinor FS-2 ile karşılaştırıldığında daha etkili olduğu, $Mg^{+2}$ ve $Ca^{+2}$ iyonlarının huntitin yüzebilirliği üzerinde yeterli bir etki yaratmamıştır. $Na_2SiO_3.5H_2O$, huntitin yüzebilirliğinde belirgin bir etkisi yoktur. CMC ile yapılan flotasyon deneyleri, huntit üzerinde büyük bir bastırıcı etkisinin olduğunu ortaya koymaktadır.

Flatation behaviour of huntite $(Mg_3Ca(CO_3)_4)$ with anionic collectors

In this study, flotation properties of huntite as unusual carbonate mineral and the effects of modifying reagents on huntite were determined. Flotation behaviour and electrokinetic properties of huntite were determined in the presence of potassium oleate and Flotinor FS-2. The effects of common ions that are expected in flotation pulps such as, $Mg^{+2}$ and $Ca^{+2}$ were studied. The influences of pH and modifying reagents like sodium silicate and carboxymethyl cellulose on surface properties of huntite were also examined. Electrokinetic measurements showed that huntite mineral were performed against pH in the presence of various NaCl concentrations. According to test results, iso-electric point of huntite was found to be around 8.0. Indifferent electrolytes are not expected to change the iso-electric point, however, as concentration increases the change in the magnitude of the zeta potential is attributed to the compression of the electrical double layer. Surface charge of huntite becomes positive in the presence of 10-2 M of $MgCl_2$ and $CaCl_2$ at all pH values. According to micro flotation test results, potassium oleate is more efficient than Flotinor FS-2. $Mg^{2+}$ and $Ca^{2+}$ ions have negative effect on the floatabilities of huntite. Sodium silicate was seen to have no significant effect on the flotability of huntite. Flotation experiments with CMC indicated that it acts as a depressant on huntite.

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Bolger, R., (1996). Flame retardant minerals, ındustrial minerals, January, 29-39.
Brandao, R. P. G., Poling, G. W., (1982). Anionic flotation of magnesite, Canadian Metallurgical Quarterly, 21, 211-220.
Dollase, W. A., Reeder, R. J., (1986). Crystal structure refinement of huntite, CaMg3(CO3)4, with X-Ray Powder Data, American Mineralogist, 71, 163-166.
Faust, G. T., (1953). Huntite, CaMg3(CO3)4, a new mineral, American Mineralogist, 38, 4-23.
Gallios, G. P., Matis, K. A., (1989). Flotability of magnesium carbonates by sodium oleate in the presence of modifiers, Separation Science and Technology, 24, 182, 129-143.
Gence, N., Özdağ, H., (1995). Surface properties of magnesite and surfactant adsorption mechanism, International Journal of Mineral Processing, 43, 37-47.
Kirschbaum, G., (2001).Minerals on fire, flame retardants look to mineral solutions, Industrial Minerals, September, 61-67.
Matis, K. A., Gallios, G. P., Stalidis, G. A., Hollick, C. T., (1989). Flotation of magnesite and dolomite by fatty acids, Transactions of the Institution of Mining and Metallurgy Section C, 98, C99-105, May-Aug.
Microfine Minerals Limited Report, (2000). Ultracarb.
O’Driscoll, M., (1994). Caustic Magnesia Markets, Playing with Fire, Industrial Minerals, March, 23-45.
Potapenko, V. E., Suvorova, D. I., Tyuryukhanov, L. G., (1985). Optimizing the reagent schedule for flotation of satkinsk magnesite using returned water, Refractories, 26, 7, 353-358, July.
Schmidt, R., (1999). In the line of fire, flame retardants overview, Industrial Minerals, February, 37-41.
Toure, B., Cuesta, J. L., Gaudon, P., Benhassaine, A., Crespy, A., (1996). Fire resistance and mechanical properties of a huntite / hydromagnesite / antimony trioxide / decabromodiphenyl oxide filled pp-pe copolymer, Polymer Degradation and Stability, 53, 371-379.