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采用热重–差示扫描量热法、热重–质谱分析、原位X射线衍射等手段对西藏班戈湖地区水菱镁矿的热分解过程、气体产物、固体产物进行研究,并对热分解机理进行分析。结果表明:水菱镁矿主要在150~650℃温度区间内发生总吸热量约为889.8 J/g多段分解反应,在350℃前脱去结晶水,生成含碳酸根的非晶态镁化合物,随后脱去结构水,并在350~550℃内脱去碳酸根释放出CO_2生成方镁石;水菱镁矿在不同温度区间产生的H_2O和CO_2逸出峰,可能与晶体结构中存在的复杂氢键系统及不同的碳酸根结构有关。
The thermal decomposition process, gas products and solid products of hydromagnesite in the Bhango Lake area of Tibet were studied by means of TG-DSC, TG-MS and in-situ X-ray diffraction. Decomposition mechanism analysis. The results show that the hydromagnesite has a total heat of about 889.8 J / g multistage decomposition mainly in the temperature range of 150-650 ℃, and the crystal water is removed before 350 ℃ to form a carbonate-containing amorphous magnesium compound , Followed by the removal of structural water and the desorption of carbon dioxide from 350-550 ° C to produce periclase. Hydrogen magnesia can produce H 2 O and CO 2 at different temperature ranges, which may be related to the existence of Complex hydrogen bonding systems and different carbonate structures.