دانلود مقاله با موضوع واکنش پالادیوم فلزی در مذاب K2CO3-K2O-B2O3-Al2O3
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موضوع به انگلیسی:
Reactivity of metallic palladium in a K2CO3-K2O-B2O3-Al2O3 melt
بخشی از متن:
The reactivity of metallic palladium in a K2CO3‐K2O‐B2O3 melt is investigated as a function of heating temperature
and time. The aqueous solubility of heat‐treated palladium is enhanced by controlling the heating conditions
leading to an optimum palladium extraction of 53% from the heat‐treated product. The alumina
crucible used as a reactor partially dissolves during the heating of metallic Pd, which requires the analysis
of palladium solubilization to be discussed in terms of K2CO3‐K2O‐B2O3‐Al2O3 system. Oxidized palladium
combines with boron and aluminum oxyanions as ligands in the molten medium to form water‐soluble palladium
compounds. Information regarding water‐soluble palladium compounds was obtained by analyzing the
precipitate collected from the palladium‐containing solution produced by water‐leaching of the heat‐treated
product. The precipitate contained Pd (0.19 wt%), Al (0.74 wt%), B (2.6 wt%), and K (45 wt%). Raman spectroscopy
confirmed the presence of oxidized palladium in the precipitate. Aluminum oxyanions with Al
