Potassium removal capacity of BaO-bearing blast furnace slags

Abstract

The potassium removal capacity of BaO-bearing blast furnace slags was investigated. The influence of basicity (CaO/SiO₂), Al₂O₃ and BaO content on potassium removal capacity was analysed by combining with the activity of K₂O in slag. The relationship between optical basicity and potassium removal capacity of slag was also studied. The results showed the temperature and basicity had a great influence on the potassium removal capacity. The increasing temperature and basicity made the reduction reaction of K₂O enhance, leading to a significant decrease in potassium removal capacity. The activity of K₂O in slag decreased with Al₂O₃ content increasing, which inhibited the reduction reaction of K₂O, leading to the increase in potassium removal capacity. BaO had a slight effect on the potassium removal capacity, and the remaining K₂O content in slag decreased with BaO content increasing from 0% to 5%. The higher optical basicity was, the weaker potassium removal capacity was.

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