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

Acta Chimica Sinica ›› 2002, Vol. 60 ›› Issue (5): 854-858. Previous Articles Next Articles

Original Articles

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

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

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

Abstract

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

CLC Number:

O642

Cite this article

Liu Zhihong;Gao Shiyang;Hu Mancheng;Shi Peng;Fan Cheng;Xia Shuping. Phase Equilibrium of 2MgO·2B_2O_3·MgCl_2·14H_2O-H_3BO_3-H_2O System at 30℃[J]. Acta Chimica Sinica, 2002, 60(5): 854-858.

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

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

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