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AssigneeMitsui Mining & Smelting Co., Ltd.
InventorsHiroshi Hata, Kenji Haiki, Kazuhiko Nishina, Masatami Sakata
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In order to remove fluorine from a zinc containing solution before zinc electro-refining in lower cost, fluorine is removed by adsorption from a zinc containing solution (leached solution) utilizing the character of the predetermined iron compound or zinc compound which can adsorb fluorine in an acid solution and desorb fluorine in an alkaline solution. The fluorine adsorbent/desorbent having adsorbed fluorine is treated in an alkaline solution, to desorb the fluorine. This makes it possible to regenerate the fluorine adsorbent/desorbent. Further, an electrolytic solution for zinc electro-refining can be prepared in lower cost, thus total zinc refining costs can be reduced.
A fluorine adsorbent/desorbent usable for adsorbing fluorine from a zinc electrolytic solution comprising fluorine and for desorbing the fluorine, wherein the fluorine adsorbent/desorbent comprises at least one basic iron sulfate group iron compound and is characterized in that when the fluorine adsorbent/desorbent as a whole is assumed to be 100 wt %, the fluorine adsorbent/desorbent comprises 70 wt % or more and 100 wt % or less of at least one of a basic iron sulfate group iron compound selected from (Fe(SO4)x(OH)y (wherein x and y are any real positive numbers)) and (FeOa(OH)b(SO4)c(H2O)d (wherein a, b, c and d are any real positive numbers)), and 0 wt % or more and 30 wt % or less of at least one of aluminum, titanium, zirconium and magnesium, or a compound of at least one of aluminum, titanium, zirconium and magnesium.
A method for removing fluorine from a zinc electrolytic solution containing fluorine, comprising:
Dependencies are inferred from the claim text.