活化煤矸石离子溶出特性初探

IONS DISSOLVING PROPERTIES OF ACTIVATED COAL GANGUE

初步研究了碳酸钠作为活化剂时煤矸石中硅铝的溶出特性.利用XRD分析煤矸石的煅烧情况,用ICP-AES(感偶等离子原子发射光谱)分析活化煤矸石离子溶出情况.结果表明:碳酸钠与已经热活化处理过的煤矸石样于820℃焙烧活化后,生成Na2SiO3(PDF82-604)和NaAl-SiO4(PDF76-1733).前者易溶于水,后者较偏高岭石易溶于碱.碱液浓度相同时,NaAlSiO4(PDF76-1733)于NaOH的溶出率高于和在KOH溶液中的溶出率.

In this article, the ion dissolution properties from coal gangue had been studied when Na2CO3 as activator. Calcination properties of coal gangue were done by XRD. The ions dissolving-out degree of coal gangue were carried out on identical coupled plasma atomic emission spectroscope （ICP-AES）. Results showed that calcined mixture of Na2CO3 and coal gangue at 820℃ formed Na2SiO3（PDF82-604） and NaAlSiO4 （PDF76-1733）, the former easily dissolved out in water, the latter easier dissolved out than metakaolin in NaOH solution of the same concentration. Furthermore, in the form of NaAlSiO4, both Si and Al exhibited higher dissolution degree in NaOH solution than in KOH solution when they have the same alkalinity （pH）.