Flotation Separation of Apatite From Dolomite Using Dodecylamine and Sodium Chloride
It is critical to separate dolomitic limestone impurities from apatite to utilize the South Florida Phosphate Rock deposits for fertilizer manufacturing. Conventional flotation scheme is not successful for separation of dolomite from its mixture with apatite. Several processing methods utilizing both anionic and cationic collectors have been proposed to solve this problem, but they have yet to be tested on a commercial scale.
Adsorption of the collectors such as dodecylamine and fatty acids is reported to be strongly influenced by electrical double layer forces. In this study, manipulation of the electrostatic forces by adding sodium chloride was attempted to achieve the desired separation. Suitable separation of apatite from dolomite was achieved with dodecylamine hydrochloride in the presence of sodium chloride. Zeta potential measurements revealed that sodium chloride acts as an indifferent electrolyte for dolomite, but causes a shift in the iso-electric point of apatite.
KeywordsSodium Chloride Zeta Potential Measurement Sodium Oleate Conclusion Separation Selective Flotation
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