煤泥分级浮选脱硫降灰试验研究

Experimental study on desulphurization and ash reduction of coal slime by graded flotation

为了探索煤泥浮选的最优条件,采用正交试验对贵州某选煤厂煤泥进行分级浮选试验。试验结果表明:大于0.25 mm粒级煤泥浮选各因素的最佳水平搭配为矿浆浓度70 g/L、转子转速1400 r/min、捕收剂用量200 g/t、抑制剂用量600 g/t,浮选精煤产率为70.21%、灰分为13.99%、硫分为0.93%;小于0.25 mm粒级煤泥浮选各因素的最佳水平搭配为矿浆浓度60 g/L、转子转速2000 r/min、捕收剂用量160 g/t、抑制剂用量400 g/t,浮选精煤产率为79.06%、灰分为14.22%、硫分为0.97%;最佳条件搭配下,浮选精煤的总产率为75.24%、总灰分为14.13%、总硫分为0.95%,浮选尾煤的总产率为24.76%、总灰分为57.30%、总硫分为1.10%。分级浮选可对煤泥有效地脱硫降灰,提高精煤产率。

To explore the optimal conditions of coal slime flotation,the orthogonal experimental design method was used to design the flotation test of coal slime from a coal preparation plant in Guizhou province.It showed that the optimal level of flotation factors of>0.25 mm slime is slurry concentration 70 g/L,rotor speed 1400 r/min,collector dosage 200 g/t,inhibitor dosage 600 g/t,and flotation cleaned coal yield is 70.21%,ash content is 13.99%,sulfur content is 0.93%.The optimal level matching of various factors of slime flotation with<0.25 mm particle size is pulp concentration 60 g/L,rotor speed 2000 r/min,dosage of collector 160 g/t and dosage of inhibitor 400 g/t,and the flotation cleaned coal yield is 79.06%,ash 14.22%and sulfur 0.97%.Under the optimal conditions,the total yield,ash and sulfur of flotation cleaned coal are 75.24%,14.13%and 0.95%,and the total yield,ash and sulfur of flotation tail coal are 24.76%,57.30%and 1.10%.Stage flotation can effectively desulphurize coal slime and reduce ash,and improve cleaned coal yield.