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化学学报
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化学学报 ›› 2002, Vol. 60 ›› Issue (5): 854-858. 上一篇    下一篇

研究论文

2MgO·2B_2O_3·MgCl_2·14H_2O-H_3BO_3-H_2O体系30℃相平衡

刘志宏;高世扬;胡满成;史鹏;范承;夏树屏   

  1. 陕西师范大学化学与材料科学学院,西安(710062);中国科学院盐湖研究所二 部,西安(710043)
  • 发布日期:2002-05-15

Phase Equilibrium of 2MgO·2B_2O_3·MgCl_2·14H_2O-H_3BO_3-H_2O System at 30℃

Liu Zhihong;Gao Shiyang;Hu Mancheng;Shi Peng;Fan Cheng;Xia Shuping   

  1. School of Chemistry and Materials Science, Shaanxi Normal University,Xi'an(710062);Xi'an Branch, Institute of Salt Lakes, Chinese Academy of Sciences,Xi'an(710043)
  • Published:2002-05-15

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487

被引次数

8

用相平衡方法研究了2MgO·2B_2O_3·MgCl_2·14H_2O-H_3BO_3-H_2O在30 ℃ 不同浓度H_3BO_3水溶液中的溶解转化产物及其溶解度。结果表明，氯柱硼镁石的 溶解转化产物，在H_3BO_3质量分数≤2.50%时为多水硼镁石；在2.50% ～ 5. 00%H_3BO_3范围时为库水硼镁石；当H_3BO_3量在5.00% ～ 5.60%之间时为章氏硼 镁石；而当H_3BO_3量≥5.60%时为三方硼镁石。提出了溶解相转化机理。

关键词: 相平衡, 氧化镁, 氧化硼, 氯化镁, 溶解度

The phase equilibrium of 2MgO·2B_2O_3·MgCl_2·14H_2O-H_3BO_3-H_2O system at 30 ℃ has been studied. The experimental results indicate that the phase transformation product is inderite (2MgO·3B_2O_3· 15H_2O) when the mass fraction H_3BO_3 is in the range from 0% to 2.50%, kurnakovite (2MgO·3B_2O_3·15H_2O) from 2.50% to 5.00%m hungtsaite (MgO·2B_2O_3·9H_2O) from 5.00% to 5.60%, successively. When the mass fraction of H_3BO_3 is higher than 5.60%, the macallisterite (MgO· 3B_2O_3·7.5H_2O) crystallizes from the solution. The mechanisms of dissolution and phase transformation have been proposed.

Key words: PHASE EQUILIBRIUM, MAGNESIUM OXIDE, BORON OXIDE, MAGNESIUM CHLORIDE, SOLUBILITY

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