鉄重石－CaCl<sub>2</sub> 水溶液間における熱水反応実験

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タイトル別名
  • Experiments on the hydrothermal reaction of ferberite with CaCl<sub>2</sub> solution
  • 鉄重石-CaCl₂水溶液間における熱水反応実験
  • テツ オモシ-CaCl ₂ スイヨウエキ カン ニ オケル ネッスイ ハンノウ ジッケン

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In order to understand the metasomatic process and mechanism of the transformation of ferberite into scheelite under saline hydrothermal conditions, the chemical reaction of ferberite with calcium chloride solution was experimentally examined. Ferberite and calcium chloride solution were sealed in the polypropylene bottle and left for fixed time. Two types of experiments, i.e., experiment 1 using powdered ferberite for knowing compositional changes of solid and solution together with reaction rate, and experiment 2 using ferberite fragments for texture analysis, were carried out at temperatures from 130 to 170 °C using calcium chloride solutions with 0.01 to 1.00 mol/L for 72 to 2016 hours. The run products were filtered by 0.20 μm membrane filters, and the filtrated solution and solid products after removal of fine iron oxides were analyzed.<br>The identified run products are only scheelite and fine-grained hematite in all runs. In the experiment 1, the amount of scheelite increased with the increase of calcium chloride concentration and temperature. Dissolution rate of ferberite for 0 to 168 hours increased with the increase of initial calcium chloride concentration and the increase of temperature: 4.18×10-7 mol/m2/s for the conditions of initial calcium chloride 0.01 mol/L-130 °C and 4.60×10-6 mol/m2/s for 1.00 mol/L-170 °C. In the runs of experiment 2, octahedral scheelite crystals grew outside on the host ferberite surfaces. The increase of crystal size over time and smooth edges of fine-grained crystals can be explained by the Ostwald ripening. Random orientations of scheelite crystals on ferberite may be due to non-epitaxial growth.

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  • 資源地質

    資源地質 66 (2), 81-88, 2016

    資源地質学会

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