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http://dx.doi.org/10.9727/jmsk.2014.27.1.53

The Efficiency of Fe Removal for Pyrophyllite by Ammonia Leaching Solution, and Their Dissolution Kinetics  

Kim, Bong-Ju (Dept. of Energy and Resource Engineering, Chosun University)
Cho, Kang-Hee (Dept. of Energy and Resource Engineering, Chosun University)
Choi, Nag-Choul (Dept. of Rural Systems Engineering/Research Institute for Agriculture and Life Science, Seoul National University)
Park, Cheon-Young (Dept. of Energy and Resource Engineering, Chosun University)
Publication Information
Journal of the Mineralogical Society of Korea / v.27, no.1, 2014 , pp. 53-62 More about this Journal
Abstract
In order to remove Fe impurity from low-grade pyrophyllite ore, the effect of certain variables such as particle size, concentration of sulfuric acid, amount of ammonium sulfate, added hydrogen peroxide, and temperature were studied. The euhedral cubic pyrites were observed in the low-grade pyrophyllite ore by reflected light microscopy, and quartz and dickite were identified in the sample by XRD analysis. The results of the Fe removal experiments showed that the best Fe removal parameters were when the particle size was at -325 mesh, the addition of $H_2SO_4$, $(NH_4)_2SO_4$ and $H_2O_2$ was at a 2.0 M, 10.0 g/l, and 3.0 M concentration, respectively, and at a $70^{\circ}C$ leaching temperature. In the dissolution kinetics analysis, the dissolution of Fe from the pyrite surface was a controlled chemical reaction, and the Fe dissolution reaction was proportioned to 0.066/R, $[H_2SO_4]^{1.156}$, $[(NH_4)_2SO_4]^{0.745}$, $[H_2O_2]^{0.428}$.
Keywords
pyrophyllite; pyrite; ammonia leaching solution; dissolution kinetics;
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