Experimental study of desulfurization and ash reduction of high-sulfur coal through flotation process

In order to seek the way for sulfur removal and ash reduction of high-sulfur coal, experimental study is made on the ash content, sulfur content, and dissemination pattern and floatability of pyritic sulfur of the high-sulfur coal produced from Fuxian County. It is intended to explore the effect on sulfur removal and ash reduction of the coal exerted by such factors as pretreatment of raw coal through ball milling and inhibitor, and froth scraping time. Test result shows that a best result can be obtained under the following conditions: milling time-20 min, ultrasonic wave treatment time-10 min, pulp density -50 g/L, dosage of collector BET -200 g/L, dosage of inhibitor CaO -2 000 g/L, dosage of frother sec.-capryl alcohol- 100 g/t, and froth scraping time-2 min. It is demonstrated that a much improved sulfur removal and ash reduction result can be expected after the high-sulfur raw coal undergoes proper pretreatment prior to flotation process.