云南某选煤厂浮选精煤焙烧工艺深度降硫研究

Deep Sulfur Reduction of Coal Concentrated by Roasting Process in Yunnan Coal Separating Plant

经过对云南某选煤厂煤泥进行浮选,获得含硫为1.36%(质量分数,下同)的浮选精煤,其中有机硫含量占全硫含量的82.35%,利用物理分选方法进一步脱硫比较困难.采用低温隔绝空气焙烧方法进行煤泥降硫,研究不同焙烧条件对浮选精煤降硫的影响规律,结果表明:在磷基复合药剂(DP)用量为5%,焙烧温度为450℃,焙烧时间为40 min,焙烧物料球团直径为小于9mm的综合焙烧条件下,浮选精煤中的硫含量降至0.30%以下,降硫效果显著,其他有害元素磷和砷等的含量也较低.

A coal flotation slurry from a selected plant in Yunnan was obtained by flotation process.The sulfur content is 1.36%,of which organic sulfur accounted for 82.35%,and physical separation method was difficult to remove sulfur further.The low temperature isolation air roasting method was used to reduce sulfur in slime,and the influence of different roasting condition on sulfur reduction was studied.The results show that in condition of the amount of DP 5%,the roasting temperature 450℃,roasting time 40 min and pellet diameter<9 mm,the final sulfur content after roasting can be reduced to below 0.30%,and the effect of reducing sulfur is significant.The contents of other harmful elements,such as phosphorus and arsenic,are also low.