高钠煤中钠的赋存形态研究

Occurrence modes of sodium species in sodium-rich coals

摘要: 以高钠煤为研究对象，采用X射线衍射（XRD）、扫描电子显微镜（SEM）、红外光谱仪（FT-IR）傅里叶分析手段相结合的方法研究了煤中钠的赋存形态及其含量分布。结果表明，大多数煤中钠主要是以水溶性钠为主，有机钠次之，不溶性钠含量较低。水溶性钠主要是以钠硝石（NaNO₃）、岩盐（NaCl）和水合离子（Na·xH₂O）形式存在；有机钠主要是以羧基钠（-COONa）形式存在；不溶性钠主要是以钠长石（NaAlSi₃O₈）形式存在。

Abstract: The occurrence modes of sodium species and corresponding content distributions in sodium-rich coals were investigated through a series of analytical methods. The results indicate that for the vast majority of coals sodium are mainly in the form of water-soluble form, then organic form, and the content of insoluble form is negligible. Among them, the water-soluble sodium is mainly presented as nitratine (NaNO₃), halite (NaCl) and hydrated ion (Na·xH₂O). The organic sodium is mainly presented as carboxyl sodium (-COONa), while the insoluble sodium mainly occurs as albite (NaAlSi₃O₈).