Two pieces of typical slags specimens were sampled from 0.25 MW test furnace wall to represent fouling and slagging

respectively.Each mineral element dynamic distribution was analyzed along the slag sample’s thickness direction by using electron probe microanalyzer.Enrichment of iron

sodium and sulphur was the substantial reason leading to forming slag’s initial layer

while enrichment of sodium

silicon

aluminum and sulphur was the most outstanding trait of the fouling sample’s initial layer.Iron and calcium played much more important role in the course of slagging than fouling.Silicon and aluminum showed identical distribution regularities in two individual samples.