イオン拡散法による水酸化マグネシウム結晶の生成

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書誌事項

タイトル別名
  • The Formation of Large Crystals of Mg(OH)<sub>2</sub>
  • イオン カクサンホウ ニ ヨル スイサンカ マグネシウム ケッショウ ノ セイセイ OH-ボエキ チュウ ニ Mg2 オ カクサン サセタ バアイ
  • by the diffusion of Mg<sup>2+</sup> into OH<sup>-</sup> mother liquor
  • OH<sup>-</sup>母液中にMg<sup>2+</sup>を拡散させた場合

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抄録

In the previous paper production of crystalline Mg(OH)2 by mutual diffusion of Mg2+ and OH- ions into distilled water was described.<br>This paper the results of the formation of Mg(OH)2 crystals by diffusion of Mg2+ into an alkaline mother liquor is reported.<br>Source of Mg2+: nitrate, sulfate, chloride.<br>Alkali: of sodium, calcium.<br>Concentrations:<br>Mg2+: N/105-N/10<br>NaOH: N/105-N/10<br>Ca(OH)2: N/100-N/40<br>Temperature: 34.5-79.5°C<br>Addition rates: 0.8-3.0cc/hr<br>Mg2+ diffused into the alkaline mother liquor via a ceramic membrane, which had an average diameter of 0.5μ.<br>The principal results can be summerized as:<br>1) No large differences were observed between the various Mg salts used.<br>2) Optimal OH- concentrations were: NaOH: N/100-N/50. Ca(OH)2: N/100.<br>Optimal Mg2+: N/50-N/30 yielded the best shape and size of M(OH)2 crystals.<br>3) Temperature above 50°C, both the shape and size of the produced Mg(OH)2 crystals improve greatly.<br>4) Mg2+ addition rate: V/1400-V/700cc/hr. (V=volume of mother liquor) optimal.<br>Higher addition rates resulted in extremely tiny crystallites of Mg(OH)2, which show almost no growth with time.<br>5) Optimal reaction time durations: 7-14 days.<br>Shorter times resulted in small crystals, longer times did not increase the size.<br>6) Final pH 10.5-11.8 resulted in the large crystals.<br>7) Under the best combination of the above optimal conditions single crystals of Mg(OH)2 100-1500μ in largest dimension were produced.<br>Yields of large crystals: 40-85%.

収録刊行物

  • 窯業協會誌

    窯業協會誌 75 (865), 271-278, 1967

    公益社団法人 日本セラミックス協会

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