望峰岗选煤厂煤泥可浮性研究

通过对望峰岗选煤厂煤泥性质的分析,说明入浮平均粒度较粗,各粒级煤泥灰分均在30%以上,嵌布较均匀,单体解离度低,为浮选降灰带来困难;煤泥表面接触角较小为50.06°,说明其天然可浮性较差,经捕收剂十二烷或柴油处理后,煤泥接触角增大,煤的可浮性提高;若要求精煤灰分为14%,则标准浮选精煤产率约为65%。通过单因素试验确定煤浆质量浓度为80 g/L,捕收剂用量为800 g/t,起泡剂用量为128 g/t时,煤泥浮选效果较好,浮选完善度最高为66.94%,精煤灰分符合要求,精煤产率较高为71.67%。最后以捕收剂、起泡剂和煤浆质量浓度为正交因素设计正交试验,考察各因素对煤泥可浮性的影响,并得出最佳浮选药剂制度。结果表明:当捕收剂用量为1000 g/t,起泡剂用量为42 g/t,煤浆质量浓度为60 g/L时,煤泥浮选效果最好,此时精煤产率为71.59%,精煤灰分为14.30%,达到高产降灰的目的。 The analysis of slime properties in Wangfenggang coal preparation plant shows that,the average particle size of slime is large,the ash of each size fraction is above 30 percent,which mix evenly with coal.The contact angle is 50.06°,which demonstrates that the flotability is poor.Treated by dodecane or diesel oil,the contact angle increase,the flotability becomes well.If the required ash of clean coal is 14 percent,the theoretical yield of standard concentrate is about 65 percent.The single factor experiment determines when the slurry concentration is 80 g/L,the dosage of diesel oil and fusel is 800 g/t and 128 g/t,the flotation effect is the best,the flotation perfect index is66.94 percent,the ash of clean coal meet the demands and the yield of clean coal is 71.67 percent.Choosing collector,frother and slurry concentration as orthogonal factors,design orthogonal test and investigate the influence of each factor on flotability.The results show that,while the dosage of collector,frother is 1000 g/t and 42 g/t,the slurry concentration is 60 g/L,the flotation effect is the best,under this condition,the yield of clean coal is 71.59percent,the ash of clean coal is 14.30 percent