【作者】 刘爱荣；

【导师】 孙冬； 樊民强；

【作者基本信息】 太原理工大学 ， 采矿工程， 2004， 硕士

【摘要】 本论文以表面活性剂SLL及SLL、Span85复配物作为乳化剂，正丁醇为助乳化剂，煤油为分散介质，制备了丙烯酰胺反相微乳液，在引发剂过硫酸钾的引发下进行微乳液聚合。合成了三种不同配方的微乳液助滤剂1^#、3^#、4^#，将1^#、4^#微乳液助滤剂加蒸馏水稀释4倍，得到2^#、5^#乳化液助滤剂。 用制备的五种复合型煤泥脱水助滤剂对六种不同变质程度的煤进行真空过滤脱水试验，通过滤饼水分、过滤速度两个指标考查了它们的助滤效果。采用JS94G+型微电泳仪，测定了各药剂在不同加药量条件下对不同煤颗粒的表面ξ-电位，分析了ξ-电位随加药量增加的变化规律，结合ξ-电位分析了各药剂的助滤机理。 过滤试验结果表明，这五种助滤剂对六种不同变质程度的煤均有较好的助滤效果。1^#药剂对无烟煤，当加药量为16.8Kg／t_干煤泥时，滤饼水分为12.80％，与空白试验的31.76％相比，降低了18.96％，过滤速度也从空白试验的0.21L／m²·s提高到2.55L／m²·s，是助滤效果最好的试点。本试验中滤饼水分最低点是由2^#药剂对焦煤在加药量为10.5 Kg／t_干煤泥时出现的，滤饼水分为12.60％，与空白试验的24.30％相比，降低了11.70％；过滤速度最大值是由5^#药剂对无烟煤在加药量为31.5Kg／t_干煤泥时出现的，过滤速度为4.08L／m²·s，与空白试验的0.21L／m²·s相比，提高了3.87L／m²·s。 五种助滤剂中1^#、3^#药剂对各种煤的助滤效果都较好。其中2^#药剂较适用中、低等变质程度的煤。3^#药剂配方中含有Span85，它起泡性很强，而且形成的泡过于稳定，对后续脱水作业产生不利影响。所以1井药剂的配方是本试验探索出的较优配方。 本论文还采用1“微乳液助滤剂做了浮选试验，浮选试验结果表明该药剂可提高浮选的捕收性和选择性，所以该助滤剂对浮选系统不会产生不良影响。更多还原

【Abstract】 An inverse microemulsion system of polyacrylamide was prepared and investigated using surfactants SLL or complexes SLL and Span85 as emulsifiers, butyl alcohol as a cosurfactant, kerosene as a dispersive medium and potassium persulfate as initiator. Threetypes of microemulsion filter aids (1#, 3#, 4# )have been synthesized by microemulsion polymerization. Other two emulsion filter aids,named 2 and 5 , were obtained from microemulsion filter aids 1 and 4# after diluted fourfold with pure water respectively.Vacuum filtration tests were carried out on six rank coals employing these five compounds as filter aids. The filtration effects were characterized by cake moisture and filtration rate. Zeta potential of coal particles were measured as a function of these five reagents as well in electrophoresis apparatus trophoresis. Change regularity of zeta potential were analysed as dosage increases. Besides, the filtration-aid mechanics of different reagents wereanalysed.The results of filtration tests show that the five filter aids havegood filtration effects on the six coals. Reagent 1 has the best filtration effect on anthracite coal with a cake moisture reduction from 31.76% to 12.80%, i.e. 18.96% at dosage 16.8Kg/t. Filtrationrate was improved significantly from 0.21 L/m2 s to 2.55 L/m 籹 at the same time. Reagent 2* helps producing the lowest cake moisture with coke coal. The lowest cake moisture is 12.60% at dosage 10.5Kg/t. Compared with the blank test, the cake moisture reduced 11.70%. Reagent 5# has the fastest filtration rate with anthracite coal as the filtration rate increases to 4.08 L/m2 s at dosage 31.5 Kg/t, and the filtration rate increase is 3.87 L/m2 s when compared with the blank test.Both reagents of 1# and 3# have good filtration effects on thesix coals. 2 reagent is suitable to low and medium rank coals. It is a disadvantage for reagent 3# to containing Span85 since Span85 shows powerful frothing capacity which is not desirable in dewatering operations.In addition, the results of flotation test showed that these reagents can improve the collecttability and selectivity of flotation. So these reagents are favorable for flotation, too.更多还原