Abstract: The compound flocculants for waste hydraulic oil were obtained by blending triethylene tetramine （TETA） and potassium hydroxide （KOH）. Under the same reactive condition，the results of comparative test demonstrated that compound flocculants TETA-KOH were more effective than either sole inorganic or sole organic flocculants. Two distinct layers were observed in the flocculation experiment of the compound flocculants. The conditions of optimal decolorization were at flocculants dosage of 6%，reaction temperature of 50℃，stirring speed of 800r/min，constant temperature of 60℃，and settling time of 12 hours. Under the above conditions，decolorization efficiency of waste hydraulic oil was 94.76%，sectional index of regenerated oil met or exceeded the technical standards of base oil MVI W-300 and the recovery of waste hydraulic oil reached 83.5%. The analysis of the decolorization showed that the flocculating effects were enhanced with the formation of hydrogen bond，charge neutralization and bridge between flocculants and colored colloid.

Key words: waste hydraulic oil, flocculation, decolorization, compound

摘要： 通过将三乙烯四胺与氢氧化钾进行复配的方法，筛选得到一种适用于废液压油絮凝脱色的复配型絮凝剂。对比实验结果表明，在相同的反应条件下，复配型絮凝剂的脱色效果明显优于单一型絮凝剂，复配型絮凝剂处理后的油液出现了明显的分层沉淀现象；当复配型絮凝剂总用量为6%、反应温度为50℃、搅拌速度为800r/min、沉降温度为60℃、沉降时间为12h时，絮凝脱色效果最佳。在该反应条件下，废液压油脱色率可达到94.76%，部分性能指标可超越MVI W-300型基础油的技术标准，废液压油回收率可达83.5%；分析认为，复配型絮凝剂能够通过氢键、电性中和等机制增强絮凝剂对油液中大分子显色物质的捕集作用以及对胶体颗粒的脱稳凝聚作用，以提升絮凝脱色效果。

关键词: 废液压油, 絮凝, 脱色, 复配