聚丙烯酰胺对含蒙脱石煤泥压滤效果的影响

以综合指标S和K为煤泥压滤效果评价指标,研究了聚丙烯酰胺(PAM)对精煤及精煤与蒙脱石混合压滤效果的影响。精煤压滤试验表明:随着阴离子PAM用量的增加,S值逐渐下降,精煤压滤效果变差,PAM用量不宜超过5.0 kg/t;当PAM用量相等时,粒度越细,S值越小,精煤压滤效果越差,当粒度为+0.075 mm时,PAM对精煤压滤效果较好。精煤与蒙脱石混合压滤试验表明:阳离子PAM的煤泥压滤效果优于阴离子PAM,当煤泥中蒙脱石含量较多时,可适当添加粗颗粒煤泥以提高其压滤性能;PAM用量相等时,粒度越细,S值越小,煤泥压滤效果越差,实际压滤过程中应尽可能减少超细颗粒-0.045 mm含量;随着蒙脱石质量分数的增加,S值逐渐下降,K值逐渐增大,煤泥压滤效果变差。最后建立了黏土矿物含量、灰分等煤泥综合指标与滤饼水分的关系,为选煤厂煤泥压滤工艺的设计提供一定的指导作用。 Taking overall indicators S and K as evaluation index,analyse the influence of PAM on pressure filtration of clean coal,mixture of clean coal and montmorillonite.The results show that,with the increase of PAM quantity,S value gradually declines,pressure filtration effect becomes worse.The adding amount of PAM shouldn't be more than 5.0 kg/t.Keeping the adding amount of PAM unchanged,the smaller particle size,the worse pressure filtration effect,which gets the best effect when the particle size is +0.075 mm.Taking the mixture of clean coal and montmorillonite as feed slime,the pressure filtration experiments show that,the cationic PAM performs better than anion PAM.While there are lots of montmorillonite in slime,it could be remedied by adding coarse slime.Keeping the adding amount of PAM unchanged,its effect is the same as that of clean coal pressure filtration.The ultrafine particle whose diameter is below 0.045 mm should be reduced as far as possible during pressure filtration.With the increase of montmorillonite,S value gradually decreases while K value increases,the effect gets worse.Establish relationship between slime overall indicators involving clay mineral content,ash content and moisture of fliter cake,which would guide the design of pressure filtration system