煤中钾存在形式研究

Modes of Occurrence of Potassium in Coals

煤中钾的存在形式与煤的灰污性质密切相关。通过萃取的方法 ,分别以水、醋酸铵和稀盐酸为萃取液对钾在我国一些煤中的存在形式进行了研究。结果显示 ,煤中钾除了以硅铝酸盐形式存在外 ,还有其它多种存在形式。尤其在低阶煤中 ,其它形式的钾占有显著份额。钾在煤中存在形式与煤种、煤阶。

The presence of potassium in coals contributes significantly to corrosion of heat exchangers in boilers and turbine materials in PEBC.The modes of occurrence of potassium in coals were investigated by sequential extraction procedures with distilled water,1 mol/L ammonium acetate and 1 mol/L hydrochloric acid in turn.The sequential extraction tests were carried out with 10 samples of coal in different ranks and particle sizes.Petrographic and proximate analyses were also proceeded at the same time.The results showed that although insoluble potassium preponderated in most coals,other modes of occurrence also existed respectably,especially in low rank coals.More water soluble and ammonium acetate soluble potassium were found in rich initinite coals,and more hydrochloric soluble potassium in rich vitrinite coals.It could also be noticed that the amounts of the four modes of occrrence of potassium varied inconsistently with the particle sizes and the amount of insoluble potassium dispersed distinctly in ash the ashes.