硫酸鉛鉱を出発物質とした白鉛鉱の形成

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書誌事項

タイトル別名
  • Formation of cerussite from anglesite
  • 硫酸鉛鉱を出発物質とした白鉛鉱の形成 : 炭酸水素ナトリウム溶液を用いた実験
  • リュウサン ナマリコウ オ シュッパツ ブッシツ ト シタ シロ ナマリコウ ノ ケイセイ : タンサン スイソ ナトリウム ヨウエキ オ モチイタ ジッケン
  • 炭酸水素ナトリウム溶液を用いた実験
  • an experimental approach with sodium bicarbonate solution

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抄録

In order to understand the processes and mechanism for the formation of cerussite from anglesite under the existence of bicarbonate, chemical reaction of anglesite with sodium bicarbonate solution was experimentally examined. Natural anglesite grains between 1.00 and 1.18 mm in diameter were sealed in the teflon bottle which contains aqueous NaHCO3 solution, and kept at 25, 50 and 75°C for up to 192 hours. A series of experiment with 1/900 mineral/solution weight ratio was carried out with changing temperature (25, 50 and 75°C), initial NaHCO3 concentration (0.01, 0.05, 0.1 and 0.5 mol/l), and reaction time (4, 8, 12, 24, 96 and 192 hours). The run products were filtered by 0.20μm membrane filters, and the filtrate and residual solid were analyzed.<br>Regardless of the initial compositions and various conditions, the only identified reaction product was cerussite. Amount of cerussite relative to anglesite increases with the increase in temperature, initial NaHCO3 concentration and reaction time. Cerussite develops on the surface of initial anglesite grains. The depth of cerussite layer increases with the increase in reaction time, suggesting that the reaction occurs at the interface between solid and solution. The rate of cerussite formation from anglesite for 24 hours increases with the increase of temperature and initial NaHCO3 concentration, in the range of 1.29 x 10-7 mol·s-1·m-2 for the condition of initial NaHCO3 0.01 mol/l-25°C and 7.63 x 10-7 mol·s-1·m-2 for the condition of initial NaHCO3 0.5 mol/l-75°C. Thus, formation of cerussite from anglesite proceeds under the existence of bicarbonate even at low temperature.

収録刊行物

  • 資源地質

    資源地質 63 (3), 143-147, 2013

    資源地質学会

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