【摘要】 利用等温热脱水和非等温热脱水的实验方法,结合X射线衍射、红外光谱等检测手段研究了青藏高原钠硼解石矿物在50~500℃温度区间的脱水过程。研究结果表明,随温度的升高,钠硼解石(NaCa[B5O6(OH)6].5H2O)的脱水分三阶段进行:50~70℃,脱失2个水形成NaCa[B5O6(OH)6].3H2O相,与钠硼解石结构研究结果对比,脱水分子是与钠硼解石分子中钠配位;70~100℃,进一步脱失2个水形成较为稳定的NaCa[B5O6(OH)6].H2O相,脱水2个分子是与钠硼解石分子中钙配位,该结构可以在100~150℃稳定存在;150~180℃,进一步升温将逐步失去最后一个与Na离子配位的水分子,同时导致[B5O6(OH)6]3-硼氧配阴离子结构的破坏,固相结构由晶型转变为无定形。更多还原

【Abstract】 Thermal dehydration process of ulexite,NaCa[B₅O₆（OH）₆] 5H₂O,was investigated by the isothermal-isobaric method,thermal analysis（DTA）,X-ray and IR-spectral methods at 50-500 ℃.It was found that there mainly existed three solid phases during dehydration of ulexite: 1) NaCa[B₅O₆（OH）₆]·3H₂O was formed as a result of losing the first two water molecules coordinated with Na;2) release of another two water molecules coordinated with Ca,leading to the formation of NaCa[B₅O₆（OH）₆]·H₂O;and 3) loss of a last water molecule coordinated with Na and release of water coming from OH groups,causing the formation of amorphous phase.更多还原